OPTICS EXPRESS
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2019
·Vol. 27
·期 20
·28480-28493
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IF 3.561
Shuyan Lin,Shuyan Lin,Guanjun Tan,Guanjun Tan,Jinhui Yu,Enguo Chen,Yalian Weng,Xiongtu Zhou,Sheng Xu,Yun Ye,Qun Frank Yan,Tailiang Guo
We propose and fabricate a multi-primary-color (MPC) quantum-dot down-converting film (QDDCF). A four-primary-color QDDCF composed of red (R), yellowish green (YG), bluish green (BG), and blue (B) subpixels was fabricated via totally five rounds of photolithographic processes. A verification platform was built up using a laser projector, and the measured results show that the QD film can expand display color gamut to 118.60% of Rec. 2020 and can cover the entire Pointer’s gamut. The issues of blue light absorption and film thickness are analyzed in detail. The combination of MPC technology and QDDCF is a potential strategy to realize ultra wide color gamut for emerging display technologies.
研究领域:
材料科学
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光学工程
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PubMed
高影响因子
ACS Applied Nano Materials
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2024
·
IF 5.3
Hao Hao,Meng Liu,Ge Tang,Yi Liu,Feng-Lei Jiang
Thiol ligands are widely used to modify quantum dots (QDs) due to their strong affinity. Aromatic structures can be introduced to improve the charge transport of the QDs. In this work, the as-synthesized CdSe/ZnS core/shell QDs were modified with thiolphenyl (TP) derivatives by ligand exchange. Photoluminescence (PL), ultraviolet–visible (UV–vis) absorption, and time-resolved photoluminescence (TRPL) spectroscopy were used to investigate the optical properties of QDs before and after ligand exchange. The elemental quantification by energy-dispersive X-ray (EDX) spectroscopy proved that TP ligands were adsorbed. The PL intensities of QDs were enhanced after ligand exchange with TP ligands (except for pentafluorothiophenol, PF-TP) through passivation. Besides, the QDs exhibited better stability and electrical conductivity. Combined with 1H nuclear magnetic resonance (1H NMR), fluorescence spectroscopy, and isothermal titration calorimetry (ITC), the effects of electron-donating/-withdrawing ability and steric hindrance of the substituents on the ligand exchanges were analyzed. The reactions of QDs with TP ligands containing electron-donating substituents were exothermic and entropy-decreasing. However, the reactions with those ligands containing electron-withdrawing substituents were exothermic and entropy-increasing. Interestingly, the reaction of PF-TP with QDs could be fitted to a two-stage model. In general, we found that the stronger electron-donating ability of substituent would lead to less desorption of OA ligands, thus fewer trap states, and better passivation, stability, and conductivity of QDs. Good stability and conductivity of QDs are prerequisites for high performance in displays. This work will greatly contribute to the selection of aromatic ligands for QDs.
研究领域:
材料科学
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光学
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化学
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高影响因子
Engineering
·
2025
·
IF 11.6
Yuyu Jing,Rongjian Zhang,Dengbao Han,Huan Liu,Wenchao Sun,Shengquan Xie,Ronghui Wang,Xin Zhong,Xian-gang Wu,Qingchen Wang,Zelong Bai,Tao Zhang,Jing Li,Haizheng Zhong
Spray-drying is a widely used industrial technique to achieve the scale-up fabrication of functional powders. In this work, we report the spray-drying fabrication of perovskite quantum dot (PQD) microspheres from a precursor solution at a scale of 2000 kg∙a −1 . The obtained PQDs are embedded in polymer microspheres, resulting in a high photoluminescence quantum yield and enhanced stability. By controlling the precursor concentration, the average size of the polymer microspheres can be tuned from 41 to 0.44 μm. The as-prepared PQD-embedded polymer microspheres are mixed with ultraviolet adhesive to fabricate PQD-enhanced optical films for liquid crystal display (LCD) backlights. These films exhibit long-term operational stability under heat, humidity, and blue light irradiation (remaining at more than 90% initial photoluminescence intensity after a 1000 h aging test at 60 °C with 90% relative humidity and 70 °C with 455 nm 150 W∙m −2 blue light irradiation). In addition, we demonstrate the use of PQD-embedded polymer microspheres as patterned color converters for micro light-emitting diode applications. Overall, this work demonstrates the scale-up fabrication of PQDs toward industrialization in display technology.
研究领域:
材料科学
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光学工程
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CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Guangyou Liu,Jie Liu,Qitian Fan,Yunhe Liu,Zheng Zeng,Zhuohang Li,Xinzao Wu,Mingyang Yang,Bo-Ru Yang
Smart windows can dynamically control the optical transmittance of natural light and efficiently reduce the energy consumption of buildings. Currently, the practical application of smart windows is limited by high power consumption, low transmittance, and complicated preparation process. Developing smart windows with fast response and high transmittance is challenging. Herein, we fabricated a smart window based on electrophoretic display (EPD) technology, which can switch between white and transparent states by changing the stacking states of the electrophoretic particles on electrodes. To further increase the transmittance of the smart window, the polyvinyl alcohol (PVA) hydrophilic layer was spin-coated on the electrode to reduce the adhesion of particles. Compared with other EPD smart window technologies, our device exhibits the fastest response time of up to 375 ms at 30 V, high transmittance of up to 78% at 632 nm, and a high contrast ratio of up to 89. In addition, to reduce the particle’s lateral diffusion and improve our device's stability, the microcup array was aligned on the interdigital electrode. The particles can be driven and stacked onto the side walls of the microcup to achieve a transparent state. This work demonstrated that the EPD device would provide a promising future for practical smart windows with high transmittance and fast response time.
研究领域:
材料科学
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光学工程
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高影响因子
Cell Reports Physical Science
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2023
·
IF 8.9
Qi Pan,Jie Fu,Sijin Liu,Jungui Zhou,Bo Ma,Shuhua Chen,Yinghua Qiu,Yi Lin,Yiqi Hu,Di Yang,Jinxing Chen,Man-Keung Fung,Yunjun Wang,Qiao Zhang,Lu Wang,Muhan Cao
The commercial application of all-inorganic perovskite (CsPbX 3 ) nanocrystals (NCs) in displays is mainly limited by low-yield and high-cost colloidal synthesis, poor stability, and unsatisfactory green emission wavelength. Here we report a simple and effective strategy that generates encapsulated CsPbX 3 @cyanuric acid (CA) super-particles (SPs) to overcome these obstacles. Because of the improved light conversion efficiency and suppressed reabsorption losses, these SPs exhibit excellent optical properties with high photoluminescence quantum yield (PLQY) of ∼90% and PL emission located at 525 nm, satisfying the high-standard benchmark Rec. 2020. Moreover, CA can greatly protect the perovskite NCs from environmental stimuli due to the trap-free bandgap of the perovskite and increased defect formation energy. By employing perovskite SPs in the display, a wide color gamut covering 94% of Rec. 2020 can be realized. This work enriches the family of perovskite NCs for high-quality displays, which will contribute to the prosperity of perovskite in the near future.
研究领域:
材料科学
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光学工程
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高影响因子
ACS Applied Nano Materials
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2022
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IF 6.14
Shuang Yang,Wen-hui Guo,Zhenyu Tang,Zehao Zhang,Haoqing Guo,Yinan Lao,Bo Qu,Lixin Xiao,Jun-jie Shi,Zhijian Chen
A long-persistent luminescence (LPL) material based on lead-free perovskite nanocrystals (Cs3In2Cl9 NCs) was synthesized by hot injection at 175 °C. Based on X-ray diffraction and theoretical calculations, the crystal structure of Cs3In2Cl9 NCs belongs to the trigonal space group R3̅c. The Cs3In2Cl9 NC powder emits white light at a peak wavelength of 430 nm with a full width at half maximum (FWHM) of about 118 nm and a photoluminescence quantum yield (PLQY) of 26.3%. The lifetime of its LPL is ∼1 s at 300 K and ∼10 s at 77 K. To explain the mechanism of LPL in Cs3In2Cl9, double self-defect states (DSDS) were proposed. To the best of our knowledge, this is the first time to obtain LPL in undoped lead-free perovskites. It promotes the application of perovskites and the explanation of the mechanism of LPL.
研究领域:
材料科学
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光学
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纳米技术
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高影响因子
ACS Nano
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2022
·
IF 18.027
Qi Pan,Jingjing Hu,Jie Fu,Yi Lin,Chen Zou,Dawei Di,Yunjun Wang,Qiao Zhang,Muhan Cao
The instability of perovskite nanocrystals (NCs) to moisture, heat, and blue light severely hinders their commercial applications in quantum dot displays. Here, organic semiconducting molecules are introduced onto CsPbBr3 NCs, and the as-obtained CsPbBr3 NCs have a high photoluminescent quantum yield (PLQY) of 82% and extremely high stability in harsh commercial accelerated operational stability tests (such as high temperature (85 °C) and high humidity (85%)). The products can survive and maintain more than 80% of the initial PL intensity value under high temperature, high humidity, and long-term blue light irradiation for hundreds to thousands of hours. They are among the most stable perovskite NCs and even superior to those encapsulated by inert shells and commercial green-emissive CdSe@ZnS quantum dots (QDs). The mechanism of the exceptional stability has been proposed, mainly including the strong interaction and moderate photocarrier transfer between the quasi type II heterostructure formed by the molecule and CsPbBr3. By using these stable CsPbBr3 NCs, a QD-enhanced liquid crystal display prototype has been successfully fabricated with a wide color gamut. This work provides understandings on the functionality of ligands in perovskite fields and a promising prospect in perovskite-based display technologies.
研究领域:
材料科学
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光电领域
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PubMed
高影响因子
Nature Communications
·
2025
·Vol. 16
·期 1
·1-13
·
IF 15.7
Guan Jie,Ma Jianhang,Zhou Likuan,Zou Yihao,Ye Lingbin,Hou Wenjun,Zhang Pan-ke,Dai Xingliang,Zhang Hao,Talapin Dmitri V.,Wang Yuanyuan
Optical patterning of quantum dots is essential for the fabrication of light-emitting diodes displays. However, current patterning methods either require inert environments or compromised quantum dots optical properties under ambient conditions. Here, we report a photoresist-free strategy enabling direct quantum dot patterning in air by using triphenylphosphine, a cost-effective, commercially available molecule that functions simultaneously as a surface ligand, photoinitiator, and oxidation protector. Under light exposure, triphenylphosphine reacts with atmospheric oxygen to trigger solubility changes, allowing precise patterning with resolutions up to 9534 dpi. The resulting devices exhibit external quantum efficiencies of 21.6% (blue), 25.6% (green), and 20.2% (red). We further demonstrate full-color active-matrix quantum dots light-emitting diodes displays by integrating the patterned red, green and blue quantum dots with thin-film transistor backplanes. This work offers a scalable, non-destructive, and environmentally compatible patterning solution for industrial display technologies.
研究领域:
材料科学
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光电子学
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PubMed
高影响因子
Advanced Optical Materials
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2025
·
IF 7.2
Lin Shi,Junchun Li,Zengce Liu,Ping Chen,Yang Jiang
Rare-earth metal halides have emerged as a compelling class of luminescent materials, offering an environmentally benign alternative to toxic lead-based halides. This work reports the successful synthesis of Cs 3 CeX 6 (X = Cl, Br, I) with tunable emission and excellent photoluminescence quantum yield (PLQY) of Cs 3 CeCl 6 . Through controlled halogen substitution in the Cs 3 CeX 6 (X = Cl, Br, I) system, composition-dependent emission redshift (Cl→Br→I) is observed. Among them, Cs 3 CeCl 6 achieves a photoluminescence quantum yield (PLQY) of 99.89%, significantly surpassing the 92.57% PLQY of Cs 3 CeBr 6 and the 7.53% PLQY of Cs 3 CeI 6 , meanwhile surpassing that of most previously reported lead-free metal halides, highlighting its exceptional potential for efficient luminescent applications. Thermal stability analysis reveals that Cs 3 CeCl 6 maintains remarkable emission efficiency at elevated temperatures, retaining > 85% of its room-temperature luminescence intensity at 438 K, compared to only 60% for Cs 3 CeBr 6 and a mere 10% for Cs 3 CeI 6 . The exceptional thermal robustness originates from their characteristically high activation energies for thermal quenching, which effectively suppress non-radiative relaxation pathways. White light-emitting diodes (LEDs) based on Cs 3 CeI 6 exhibit a remarkable color rendering index (R a ) of 95.1, in contrast to those based on Cs 3 CeCl 6 (R a = 77.6) and Cs 3 CeBr 6 (R a = 79.6); all WLEDs based on Cs 3 CeX 6 (X = Cl, Br, I) demonstrate excellent atmospheric stability. With near-unity PLQY and remarkable thermal stability of Cs 3 CeCl 6 , coupled with the outstanding white LEDs performance of Cs 3 CeI 6 , Cs 3 CeX 6 (X = Cl, Br, I) compounds emerge as promising candidates for next-generation environmentally friendly optoelectronic applications, particularly in advanced display technologies and solid-state lighting systems. This work contributes to the advancement of eco-friendly emitters with both high efficiency and practical utility in next-generation optical technologies.
研究领域:
材料科学
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光电子学
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发光材料
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固态照明
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ACS Applied Electronic Materials
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2025
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IF 4.7
Rui Ma,Zhicheng Sun,Yuwei Hao,Ting Wang,Siying Guan,Lu Han,Ruping Liu,Shouzheng Jiao,Yuanyuan Liu,Yang Zhou
Alternating current electroluminescent (ACEL) devices are recognized for their simple structure, uniform and soft light emission, tunable frequency, and broad wavelength range, making them suitable for diverse display and lighting applications. In this study, four types of inorganic ACEL devices with top-emission (TES), bottom-emission (BES), dual-emission (DES), and coplanar-emission (PES) configurations were fabricated using copper-doped zinc sulfide (ZnS:Cu) as the luminescent layer and barium titanate (BaTiO3) as the dielectric layer. The core novelty of this work lies in the systematic optimization of the full screen printing process for multi configuration inorganic ACEL devices, achieving independent substrate manufacturing on rigid (ITO glass) and flexible (ITO-PET, PI, cotton, and paper) substrates. In addition, we propose a PES-ACEL configuration with a polar liquid/solid interface excitation mechanism, breaking the traditional dependence of ACEL on dielectric layers and transparent electrodes and expanding substrate compatibility for special scenarios. All devices exhibited stable blue-green emission with a wavelength range of 480–550 nm, peaking at approximately 510 nm. Specifically, the BES-ACEL device demonstrated the highest performance, achieving a peak brightness of 141 cd/m2. The brightness of devices fabricated on various substrates increased monotonically with rising voltage (40–160 V) and frequency (100–400 Hz), highlighting excellent substrate independence and mechanical flexibility. The devices also withstood mechanical deformation, confirming their potential for wearable applications. Furthermore, to enhance functional versatility, an ACEL device was integrated with an STM32 microcontroller and a WiFi module to construct a dynamic display system. This system innovatively adopts an 8-channel relay module to connect the microcontroller and segmented “8” electrodes, realizing the conversion of 5 V DC input to 220 Vpp square wave output at 2 kHz and solving the problem of matching low-voltage control signals with high-voltage ACEL driving requirements. This system enables smartphone-based remote control for instantaneous switching of digital patterns (1–9). The wireless platform maintained stable illumination during dynamic operation, demonstrating a successful expansion of ACEL technology from basic lighting toward interactive human–machine interfaces.
研究领域:
光电子学
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显示技术
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柔性电子学
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无线传感与控制
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人机交互
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高影响因子
Materials Today Chemistry
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2025
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IF 6.7
Minghao Zhai,Wanan Cai,Jingtao An,Chunli Ma,Tingting Zhou,Haijun Niu,Wen Wang
A highly efficient, stable electrochromic (EC) material with high photoluminiscent (PL) intensity contrast is crucial in EC/electrofluorochromic (EC/EFC) bifunctional devices (EC/EFCD) which play important role in display and camouflage. To solve this issue, we utilized non-planar triphenylamine (TPA) with electron-accepting triphenyltriazine (TPT) to construct novel electron-rich donor-electron-deficient acceptor (D-A) type diamine monomer, which was polymerized with three different diacid monomers to form three non-conjugated polyamides (PAs). TPT-TPA-CA film exhibits strong solid-state emission ( φ PL = 74 %), suitable for highly integrated EC/EFCD, maintaining not only high optical transmittance change ( ΔT = 46 %) after cycling for 3000 s but also high PL intensity contrast ( ΔPL = 70 %). Furthermore, these PAs are yellow in the neutral (bleached) state and green in the oxidized (colored) state during the EC process, demonstrating their potential for display and military camouflage. Especially, TPT-TPA-OA film exhibits good cycle stability (more than 15000 s), high ΔT (72 %), and fast response times (3.5 s/4.1 s for t c / t b ) . Moreover, due to strong emission, TPT-TPA-CA exhibits promising in the application of chemical sensors which has low limit of detection ( LOD ) for the explosive 2,4,6-Trinitrophenol (TNP) ( LOD = 76 nM in solution and LOD = 304 nM in film). In summary, this research provides a novel approach for the field of EC/EFC displays and chemical sensors.
研究领域:
材料科学
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电致变色
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光电功能器件
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高分子化学
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传感器
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伪装技术
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高影响因子
JOURNAL OF LUMINESCENCE
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2025
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IF 3.6
Changbo Deng,Yu Zhang,Dachuan Zhang,Zhulu Xie,Qiuping Huang,Zhengping Fu,Yalin Lu
Direct optical patterning of perovskite colloidal quantum dots (QDs) mediated by surface chemistry has emerged as a critical focus for new display technologies. However, the instability of weakly bound ligands on QD surfaces significantly restricts their practical applications. To address this challenge, we propose a novel and straightforward strategy that utilizes the strongly binding zwitterionic photocrosslinkable ligand 2-methacryloyloxyethyl phosphorylcholine (MPC) via ligand exchange, enabling direct optical patterning of CsPbBr 3 QDs without requiring an inert environment or precise ultraviolet (UV) light intensity control. The MPC ligand exhibits dual functionality: it effectively passivates QD surface defects, achieving a photoluminescence quantum yield (PLQY) of 83.8 ± 1.4 % for CsPbBr 3 QD colloidal solutions, while simultaneously enabling direct optical patterning in ambient air. This patterning mechanism relies on methacrylate groups that initiate polymerization upon UV irradiation, forming a robust crosslinked network. The resulting patterns exhibit a high PLQY of 72.5 ± 5.9 %. Additionally, theoretical calculations reveal that the planar orientation of MPC ligands on the QD surface minimizes inter-QD spacing, promoting the formation of dense and smooth films. This innovative approach not only enhances the optical performance of CsPbBr 3 QDs but also paves the way for their practical implementation in high-quality, vivid image displays.
研究领域:
材料科学
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纳米技术
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光电子学
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表面化学
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高影响因子
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