Journal of Materials Chemistry C
·
2023
·Vol. 11
·期 26
·9030-9036
·
IF 6.4
Jinyi Wang,Xudong Wang,Chenjie Zhang,Xinyu Zhang,Tianliang Zhou,Rong-Jun Xie
Near-infrared (NIR) phosphors play a key role in phosphor-converted NIR emitters, but to find broadband phosphors still remains a great challenge due to the lack of strategies for screening appropriate hosts. Herein, we report a broadband Sr6Sc2Al4O15:Cr3+ NIR phosphor by choosing a host that has crystallographic sites accommodated for both Ce3+ and Cr3+ simultaneously. The emission spectrum of Sr6Sc2Al4O15:Cr3+ covers the region of 600–1500 nm, having a maximum at 860 nm and a full width at half-maximum (FWHM) of 241 nm. A NIR pc-LED was fabricated by combining the Sr6Sc2Al4O15:Cr3+ phosphor with a blue LED, which can produce a NIR output power of 0.16 mW driven at 750 mA. The fabricated NIR emitter demonstrates a good suitability in night vision and non-destructive detection.
研究领域:
材料科学
·
光学工程
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产品关联
DOI
高影响因子
NATURE
·
2023
·Vol. 622
·期 7983
·493-498
·
IF 64.8
Han Dongyuan,Wang Jie,Agosta Lorenzo,Zang Ziang,Zhao Bin,Kong Lingmei,Lu Haizhou,Mosquera-Lois Irea,Carnevali Virginia,Dong Jianchao,Zhou Jianheng,Ji Huiyu,Pfeifer Lukas,Zakeeruddin Shaik M.,Yang Yingguo,Wu Bo,Rothlisberger Ursula,Yang Xuyong,Grätzel Michael,Wang Ning
Lead halide perovskite light-emitting diodes (PeLEDs) have demonstrated remarkable optoelectronic performance 1 , 2 , 3 . However, there are potential toxicity issues with lead 4 , 5 and removing lead from the best-performing PeLEDs—without compromising their high external quantum efficiencies—remains a challenge. Here we report a tautomeric-mixture-coordination-induced electron localization strategy to stabilize the lead-free tin perovskite TEA 2 SnI 4 (TEAI is 2-thiopheneethylammonium iodide) by incorporating cyanuric acid. We demonstrate that a crucial function of the coordination is to amplify the electronic effects, even for those Sn atoms that aren’t strongly bonded with cyanuric acid owing to the formation of hydrogen-bonded tautomeric dimer and trimer superstructures on the perovskite surface. This electron localization weakens adverse effects from Anderson localization and improves ordering in the crystal structure of TEA 2 SnI 4 . These factors result in a two-orders-of-magnitude reduction in the non-radiative recombination capture coefficient and an approximately twofold enhancement in the exciton binding energy. Our lead-free PeLED has an external quantum efficiency of up to 20.29%, representing a performance comparable to that of state-of-the-art lead-containing PeLEDs 6 , 7 , 8 , 9 , 10 , 11 , 12 . We anticipate that these findings will provide insights into the stabilization of Sn(II) perovskites and further the development of lead-free perovskite applications.
研究领域:
材料科学
·
光电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Ou Hai,Tong Li,Bin Qin,Jian Li,Zechuan Qi,Qiang Ren,Xiulan Wu
While lead-free perovskite has attracted widespread interest in the optical field by overcoming their toxicity and stability disadvantages compared to conventional lead-based perovskite, the low photoluminescence quantum yield (PLQY) of lead-free perovskite has greatly limited their commercialization path. In this research, a modified co-precipitation method was used to prepare Cs 2 ZrCl 6 , which was achieved by the addition of TeCl 4 to shift the emission wavelength from 436 to 556 nm with bright yellow emission, the optimal PLQY of 98.2% was achieved by the addition of Te 4+ in the amount of 1 % and the optimization of the reaction concentration. First-principles calculations and spectral analysis of Cs 2 Zr 1-x Te x Cl 6 show that the broadband yellow light emission comes from self-trapped excitons (STEs) in Cs 2 Zr 1-x Te x Cl 6 . In addition, the luminous intensity of the prepared Cs 2 Zr 1-x Te x Cl 6 was 57.3, 63.3 and 90.1% of the initial intensity after exposure to air for 30 d, cyclic intermittent heating to 200°C and ultraviolet (UV) irradiation for 7 d, respectively. Finally, Cs 2 Zr 1-x Te x Cl 6 and Cs 2 ZrCl 6 :10% Bi were used as phosphors and encapsulated with a UV chip to make three different colors of light-emitting diodes (LED), where the white LED (WLED) had CIE coordinates of (0.3061 0.3244), color temperatures, color rendering indices as well as color tolerances of 6921 K, 84 and 6.52 respectively. This research provides a new approach to improve the performance of lead-free perovskite.
研究领域:
材料科学
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光学
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光子学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
ACS Nano
·
2025
·
IF 16
Qianqian Wang,Wenxin Bian,Junjie Si,Feng Ding,Zichen Zhao,Bo Hu,Kaihang Wang,Jiefu Tan,Desui Chen,Sunan Xu,Tenglong Sun,Muzhi Cai,Zugang Liu
Lead halide perovskites are promising materials for high-performance light-emitting diodes (LEDs) owing to their optoelectronic properties, including high photoluminescence quantum yield (PLQY), tunable bandgap, and outstanding charge carrier mobility. Despite rapid progress, achieving high luminance at a low operating voltage remains a major challenge for perovskite LEDs (PeLEDs), largely due to limited carrier injection in conventional device architectures. Here, we present a synergistic strategy to realize low-voltage, high-efficiency PeLEDs. The device integrates a [2-(3,6-dibromo-9H-carbazol-9-yl)ethyl]phosphonic acid (Br-2PACz) self-assembled monolayer, a compact three-dimensional (3D) perovskite emissive film, and a zinc oxide (ZnO) electron transport layer (ETL). Sulfobetaine 10 (SFB) is employed to regulate crystallization, leading to dense and uniform perovskite films with reduced trap density. The Br-2PACz interlayer simultaneously passivates interfacial defects, facilitates hole injection, and suppresses electron leakage by tuning the energy levels. In addition, the high-mobility ZnO ETL ensures efficient electron injection. The optimized PeLED exhibits a low turn-on voltage of 1.9 V and achieves a luminance of 39,000 cd m–2 and a current density of 38.5 mA cm–2 at 2.5 V. The device delivers a peak external quantum efficiency (EQE) of 22.5% and a peak power efficiency (PE) of 128.7 lm W–1. Moreover, this strategy demonstrates good scalability: large-area PeLEDs (1600 mm2) retain a competitive EQE of 11.2% with uniform emission. This work supplements the research on energy-efficient, low-voltage-operating, and scalable PeLEDs.
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DOI
PubMed
高影响因子
NATURE
·
2026
·
IF 56.1
Lin Lihua,Wang Jie,Hu Hailong,Luo Haolin,Liu Yanbin,Yang Xingjie,Su Jingnan,Li De’er,Xu Zhongwei,Luo Chengyu,Yu Yongshen,Guo Tailiang,Li Fushan
Full-colour ultrahigh-resolution quantum dot light-emitting diodes (URQLEDs) with high efficiency and stability are required for next-generation near-eye displays 1 , 2 , 3 . However, existing quantum dot (QD) patterning techniques struggle to simultaneously achieve submicrometre pixel sizes, full-colour integration and high device performance. Here we report a dual-action force dynamics (DAFD) strategy using a hard silicon template as a nanoimprinting stamp, combined with integral inverted transfer printing. This approach enables red–green–blue (RGB) full-colour QD pixel arrays with densities in the range 9,072–25,400 pixels per inch (PPI), maintaining high-fidelity pattern replication with a conservative transfer yield >99.9%. The method is compatible with both CdSe/ZnS and perovskite QDs on rigid and flexible substrates. Beyond patterning, we identify and address a previously underappreciated bottleneck in ultrahigh-resolution devices—electric-field non-uniformity arising from pixel microstructures. Matching the dielectric constant of the leakage-current-blocking layer to that of the QDs by means of TiO 2 nanoparticle incorporation yields a more uniform electric-field distribution, effectively suppressing edge effects and enhancing both efficiency and operational stability. Red URQLEDs at 12,700 PPI achieved a peak external quantum efficiency (EQE) of 26.1% and an operational lifetime T 95 @1,000 cd m − 2 of 65,190 h. Comparable enhancements in device performance were obtained for green and blue URQLEDs, with EQE improvements of 124% and 119%, respectively. RGB-pixelated white URQLEDs reached a peak EQE of 10.1%. By integrating these URQLEDs with complementary metal–oxide–semiconductor (CMOS) integrated circuits, we demonstrated solution-processed active-matrix URQLED animated displays.
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DOI
PubMed
高影响因子
JOURNAL OF LUMINESCENCE
·
2025
·
IF 3.6
Ying Chen,Han Zhang,Yi-Yang Sun
To achieve healthy illumination, phosphor-converted white light-emitting diodes (WLEDs) that can be excited by ultraviolet (UV)-violet light are becoming increasingly important. Herein, we report a novel yellow-emitting phosphor, Ba 2-x Sc 2 B 4 O 11 : x Eu 2+ (BSBO:Eu 2+ ), which exhibits exceptional optical properties and is suitable for UV-violet-excited WLEDs. BSBO:Eu 2+ shows a broad excitation spectrum ranging from 230 to 450 nm, and emits a yellow light with an ultrawide FWHM of about 137 nm centered at 577 nm. The internal and external quantum efficiencies of the phosphor were measured to be 89% and 41%, respectively. The fluorescence lifetime of BSBO:0.01Eu 2+ was determined to be 2.74 μs. By combining BSBO:0.01Eu 2+ with a commercial blue phosphor (BaMgAl 10 O 17 :Eu 2+ ) and a 365 nm LED, we achieved a warm WLED with a correlated color temperature (CCT) of 4543 K. By further integrating a green phosphor ((Ba, Sr) 2 SiO 4 :Eu 2+ ), the WLED achieved superior color quality, reaching an Ra of 93.0, in comparison with the commercial YAG:Ce 3+ with an Ra of 78.4, and a CCT of 7078 K—well-suited for precise color reproduction needs.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
高影响因子
PHYSICA B-CONDENSED MATTER
·
2025
·
IF 2.8
Xinshun Qin,Muhammad Umair Ali,Hongbo Mo,Zhengtian Yuan,Yanling He,Alan Man Ching Ng,Aleksandra B. Djurišić
Perovskite light-emitting diodes (LEDs) with different self-assembled monolayers (SAMs), namely 2-(9H-carbazol-9-yl)ethyl]phosphonic acid (2PACz), [4-(3,6-dimethyl-9H-carbazol- 9-yl)butyl] phosphonic acid (Me-4PACz), and [2-(3,6-Dichloro-9H-carbazol-9-yl)ethyl]phosphonic acid (Cl-2PACz), have been investigated. We find that the underlying SAM affects the perovskite morphology despite the use of poly[(9,9-dioctylfluorenyl-2,7-diyl)-alt-(4,4′-(N-(4-butylphen-yl)))] (TFB) hole transport layer between the SAM and the perovskite. Despite similar device performance in terms of maximum luminance and external quantum efficiency, the devices exhibit significant differences in lifetime which correlate with perovskite thin film morphology. We show that significant roughness is detrimental to the device stability. The devices with 2PACz SAM, which exhibit the most favorable film morphology, exhibit T 50 lifetime of 1.43 h.
研究领域:
材料科学
·
光电技术
✓ 已验证
产品关联
DOI
高影响因子
POLYHEDRON
·
2025
·
IF 2.6
Yifeng Liu,Yifei Liu,Meihua Wu,Yuena Jiang,Zhaohui Huang,Xin Min,Ruiyu Mi
Red phosphors with good luminescent properties have attracted widespread attention because they can satisfy the lighting requirement of white LEDs (Light Emitting Diode) preferably. K 2 ZnP 2 O 7 : Eu 3+ powder with a stable structure was successfully synthesized via the high-temperature solid-state method, involving a two-step process: pre-sintering at 450 °C for 12 h followed by sintering at 650 °C for 8 h. Under the excitation of 394 nm near ultraviolet light, the phosphor produces bright red emission. The highest emission peak of the K 2 Zn (1–1.5x) P 2 O 7 : xEu 3+ (x = 0.1) phosphor is located at 595 nm ( 5 D 0 → 7 F 1 ), followed by the red emission peak at 612 nm ( 5 D 0 → 7 F 2 ). When the temperature reaches 150 °C, the emission integral intensity of K 2 ZnP 2 O 7 : 0.1Eu 3+ remains 91.1% of that at room temperature (ΔE = 0.1946 eV), which proves that K 2 ZnP 2 O 7 : Eu 3+ has good thermal stability. In addition, the CIE (International Commission on Illumination) coordinates of the white LED packaged by K 2 ZnP 2 O 7 : 0.1Eu 3+ are (0.3312,0.3578), and the CCT (Correlated Color Temperature) and CRI (Color Rendering Index) of the LED lamp are 5765 K and 87.6, respectively. This indicates that K 2 ZnP 2 O 7 :Eu 3+ is promised as a red-emitting phosphor for white LED excited by near-ultraviolet chips.
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高影响因子
ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Zhixiang Ren,Bingbing Guo,Shengnan Liu,Yaxiao Lian,Yaxin Wang,Shiyu Xing,Yichen Yang,Gan Zhang,Weidong Tang,Yuxiang Gao,Zixiang Wang,Jiawei Hong,Minhui Yu,Shiyuan Zhang,Dongchen Lan,Chen Zou,Baodan Zhao,Dawei Di
Perovskite LEDs (PeLEDs) have emerged as a next-generation light-emitting technology. Recent breakthroughs were made in achieving highly stable near-infrared and green PeLEDs. However, the operational lifetimes (T50) of visible PeLEDs under high current densities (>10 mA cm–2) remain unsatisfactory (normally <100 h), limiting the possibilities in solid-state lighting and AR/VR applications. This problem becomes more pronounced for mixed-halide (e.g., red and blue) perovskite emitters in which critical challenges such as halide segregation and spectral instability are present. Here, we demonstrate bright and stable red PeLEDs based on mixed-halide perovskites, showing measured T50 lifetimes of up to ∼357 h at currents of ≥25 mA cm–2, a record for the operational stability of visible PeLEDs under high current densities. The devices produce intense and stable emission with a maximum luminance of 28,870 cd m–2 (radiance: 1584 W sr–1 m–2), which is record-high for red PeLEDs. Key to this demonstration is the introduction of sulfonamide, a dipolar molecular stabilizer that effectively interacts with the ionic species in the perovskite emitters. It suppresses halide segregation and migration into the charge-transport layers, resulting in enhanced stability and brightness of the mixed-halide PeLEDs. These results represent a substantial step toward bright and stable PeLEDs for emerging applications.
研究领域:
材料科学
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光电子学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Polymer Materials
·
2025
·
IF 4.7
Xiangzhuo Han,Yingchao Zhang,Jinkai Wang,Zhanchen Cui,Zuosen Shi
Sulfonate oxime ester photoinitiators (PIs) based on a thioether-substituted 1,8-naphthalenedicarboximide backbone exhibit good absorption at the emission wavelengths of commonly used LED lamps (385, 395, and 405 nm). The presence of weak C–S and N–O bonds in the molecular structure enables them to be cleaved under light, which leads to the generation of free radicals and cations with efficient initiation properties. Electron paramagnetic resonance spectroscopy supports the mechanism of C–S bond cleavage to produce free radicals, and UV–visible real-time spectroscopy in the presence of Rhodamine B base supports the mechanism of N–O bond cleavage to produce acids. These compounds are high-performance photoinitiators without any other additives for the polymerization of double-bonded compounds and epoxides. They can be initiated at low concentrations when exposed to UV-LEDs. These photoinitiators provide important ideas for the design and synthesis of photoinitiators, which have great potential for application in the field of photopolymerization, especially in hybrid light-curing systems.
研究领域:
材料科学
·
光化学
·
聚合物科学
✓ 已验证
产品关联
DOI
高影响因子
PROGRESS IN ORGANIC COATINGS
·
2020
·
IF 4.469
Xiaoyu Ma,Ding Cao,Xiaotong Hu,Jun Nie,Tao Wang
Novel photoinitiators (α-DKs) bearing α-dicarbonyl groups as initiating group and aromatic groups as chromophore group were synthesized and developed as visible light type I photoinitiators with high performance for radical photopolymerization of acrylate. α-DKs exhibit good absorption at 405 nm and higher initiation efficiency compared with commercial initiator camphorquinone (CQ) under LED sources. Meanwhile, α-DKs were found to efficiently photosensitize bis (4-methylphenyl) hexafluorophosphate (ION) and initiate both free radical polymerization and cationic polymerization.
研究领域:
材料化学
·
光化学
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2022
·
IF 10.383
Zhenyu Wang,Xinyu Shen,Chengyuan Tang,Xin Li,Junhua Hu,Jinyang Zhu,William W. Yu,Hongwei Song,Xue Bai
Oleylamine and oleic acid are common organic capping ligands used in the hot injection preparation of perovskite quantum dots (QDs). Their labile nature is responsible for the poor colloidal stability and conductivity that affect the performance of perovskite QD light-emitting diodes (LEDs). We introduced 4-trifluoro phenethylammonium iodide (CF3PEAI) directly in the synthesis and found that CF3PEAI efficiently modified the I– vacancy defects on the QD surface and partially substituted the surface capping ligand oleylamine. The strong electron pulling ability of F in CF3PEAI results in a more positive −NH3+ terminal compared to that of PEAI, which promotes tight bonding of CF3PEAI on the surface of CsPbI3 QDs. As a result, we achieved bright QDs with a photoluminescence quantum yield of 92% and efficient red LEDs. The maximal luminance was improved to 4550 cd m–2 for 685 nm red light, which was nearly 4.6-fold of the LEDs with plain CsPbI3 QDs. Additionally, the peak external quantum efficiency reached 12.5%.
研究领域:
材料科学
·
光电技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）