Advanced Optical Materials
·
2026
·Vol. 14
·期 36
·e71764
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IF 7.2
Lumen Chao,Ziyang Bao,Qiang Gu,Xiaoyun Mi,Quansheng Liu
All-inorganic lead-free Cs 2 ZnCl 4 perovskite quantum dots (QDs) attract significant attention due to their non-toxicity and unique optoelectronic properties. However, the yield of Cs 2 ZnCl 4 colloidal QDs synthesized via ligand-assisted reprecipitation (LARP) remains extremely low, and their stability is poor, limiting their applications. Here, we report a post-processing strategy that employs mesoporous nano-SiO 2 to anchor Cs 2 ZnCl 4 QDs within its pores, creating spatial confinement that prevents Cs 2 ZnCl 4 QDs aggregation and quenching while passivating surface defects and reducing non-radiative recombination pathways. This strategy enables the powderization of Cs 2 ZnCl 4 colloidal QDs, and the Cs 2 ZnCl 4 /SiO 2 nano-composite particles (NCP) exhibit bright blue photoluminescence (CIE 0.15, 0.12). Compared to the Cs 2 ZnCl 4 colloidal QDs, the Cs 2 ZnCl 4 /SiO 2 NCP demonstrates a 10 times increase in PL intensity, with a high PLQY (74.28%) and an ultrafast photoluminescence lifetime (2.4 ns). Moreover, due to nano-SiO 2 protection, the Cs 2 ZnCl 4 /SiO 2 NCP exhibits excellent ambient conditions (>6 months, 86.6%) and harsh conditions (temperature, humidity, light, etc.) stability, which is superior to that of other reported halide perovskite QDs. This strategy offers a viable approach to address the challenges of low yield, low photoluminescence efficiency, and poor stability in colloidal perovskite QDs, thereby creating opportunities for their commercial application.
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DOI
高影响因子
Small
·
2026
·
IF 11.8
Shengze Ban,Yueqi Shen,Jianyi Huang,Yuxiang Xu,Wanxin Chen,Yu Tong,Weihua Ning
0D metal halides are promising light emitters owing to strong quantum confinement and efficient self-trapped exciton (STE) emission, yet achieving both broadband tunability and near-unity PLQY in lead-free systems remains challenging. This study reports the synthesis and comprehensive characterization of Sb 3+ -doped 0D perovskite single crystals, (BYA) 4 InCl 7 : xSb 3+ . Structural analysis confirms the successful substitution of Sb 3+ into the isolated [InCl 6 ] 3− octahedra, which are spatially separated by bulky BYA + organic cations, thereby preserving the intrinsic 0D framework. Sb 3+ incorporation induces a substantial bandgap narrowing from 4.08 to 2.85 eV, accompanied by a pronounced enhancement of broadband STE emission. At an optimal doping level (x = 4.87%), the material achieves an ultrahigh PLQY of 97.53%. Temperature-dependent photoluminescence measurements, together with density functional theory calculations, reveal that the exceptional emission efficiency arises from strong electron phonon coupling and a low activation energy for thermal quenching. Furthermore, a prototype white light-emitting diode fabricated using the (BYA) 4 InCl 7 : Sb 3+ phosphor exhibits excellent color rendition (CRI = 89.3) and robust operational stability. This study elucidates the structure property interplay governing Sb 3+ -doped 0D indium halides and highlights their promise as high-performance emitters for advanced optoelectronic devices.
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DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Wenbo Ji,Fengmei Zhu,Yuan Gao,Jianbei Qiu
The performance and service life of a traditional NIR phosphor-converted light-emitting diodes sealed by epoxy resin are affected over time due to the low thermal conductivity of the casting material that leads to excessive heat build-up, an accelerated aging and discoloration of the resin. Here, we report the synthesis and characterization of a highly efficient NIR emitting LiAl 5 O 8 :Cr 3+ nanocrystals embedded in transparent glass-ceramic. Under 415 nm light excitation the emission, the new NIR phosphor exhibits NIR emission in sharp lines covering 650∼1000 nm to originate from the spin-allowed 4 T 2 / 2 E→ 4 A 2 transition of Cr 3+ ions, with an emission peak at ∼ 720 nm and an optimal PLQY of about ∼ 41.28%. The NIR emission originates from the spin-allowed 4 T 2 / 2 E→ 4 A 2 transition of Cr 3+ . The transparent glass-ceramic showed excellent luminescence thermal stability; the integrated luminescence intensity measured at 383 K is ∼ 66.55% of that measured at room temperature (303 K). We constructed a NIR pc-LED light source device by coupling a piece of LiAl 5 O 8 :Cr 3+ nanocrystal-laden glass-ceramic and a purple LED chip and performed characterization of the luminescence properties of this device. The potential application of this device in NIR imaging was demonstrated. Our study provides a basis for further development of thermal stable and highly efficient transparent glass-ceramic based NIR luminescence materials and the exploration for their applications.
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ADVANCED FUNCTIONAL MATERIALS
·
2025
·
IF 19
Junyang Yin,Jie Zhang,Wen Pan,Zhenzi Wu,Feng Wu,Jiangnan Dai,Jiajun Luo,Changqing Chen
Ongoing research on perovskite quantum dots (PQDs) spanning diverse areas such as crystallography and biology represents a rapidly expanding frontier in nanotechnology, yet is still limited by the poor water stability and inadequate biocompatibility. Herein, this study reports an ultra-simplified, eco-friendly, cost-effective, and industrial-grade fully aqua-mediated ripening (FAMR) technique for aqueous-PQDs (APQDs) with tunable spectra, achieved by directly stirring the raw precursors with zwitterionic ligands in water at a set pH via Ostwald ripening crystallization.These APQDs exhibit high photoluminescence quantum yields (PLQYs) of up to 82.8% (blue), 98.2% (green), and 92.4% (red), respectively. Owing to the highly efficient bidentate binding of zwitterionic ligands onto APQDs surfaces, as confirmed by theoretical studies, the APQDs demonstrate excellent water storage stability for over 1 month and can retain an impressive 83% of the initial PL intensity after 3 months when transferred to EtOH. With elevated exciton binding energy, extended carrier lifetimes, and lower defect density, APQDs also outperform conventional oil-phase PQDs in terms of thermal and UV irradiation stability. Based on this, water-soluble fluorescent nanoparticles (NPs) are synthesized through self-assembly of APQDs and DSPE-PEG 2000 using EtOH and water as biphasic solvents. Finally, the APQDs@NPs, possessing desired luminescence and biocompatibility, exhibited excellent bioimaging performance in U251 cells.
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OPTICS EXPRESS
·
2024
·Vol. 32
·期 22
·37984-37993
·
IF 3.2
Linfeng Wang,Xiaoyue Huang,Tingting Zhang,Jinke Bai,Ting Zhao,Bing Xu,Qinghua Li,Xiao Jin,Xiao Jin,Yuxiao Wang,Xueru Zhang,Yinglin Song,Yinglin Song
InP quantum dots (QDs) have emerged as promising nanomaterials in various fields due to their exceptional optical properties. However, its wide emission linewidth limits further application. In this study, we synthesized high-quality InP/ZnSe/ZnS QDs by suppressing hole defects. The unreacted In precursors during nucleation easily enter ZnSe in the subsequent shelling process, forming a hole trapping center that adversely affects the photo-excitons radiative recombination. Our results demonstrate that the presence of In ions in ZnSe shell enhances exciton-phonon coupling, broadens the fluorescence emission spectrum, and weakens exciton binding energy. The optimized InP QDs exhibit a line width of 44 nm and 90% PLQY at 630 nm. Furthermore, our investigation into the interaction between shell hole defects and core exciton function provides valuable insights for designing and preparing another high-performance core-shell heterojunction QDs.
研究领域:
纳米技术
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材料科学
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光学
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PubMed
高影响因子
MATERIALS CHEMISTRY AND PHYSICS
·
2021
·
IF 4.094
Xianhao Min,Qifei Xie,Zhiguo Wang,Xinzhong Wang,Mingxiang Chen
As traditional capping ligands like oleic acid (OA) and oleylamine (OLA) cannot efficiently maintain the optoelectronic properties and stability of iodide perovskite nanocrystals (NCs), post synthesis surface modification with some other ligand is a convenient and valid method to solve these problems to some extent. Here we promote a long carbon chain ligand with a thiol group, 1-Octadecanethiol (ODT), to realize the passivation of the surface of CsPbI 3 NCs after the synthesis process. After modification, our ODT-CsPbI 3 NCs exhibit excellent optical properties with a high PLQY of 93% and outstanding stability under different conditions compared to the untreated samples.
研究领域:
材料科学
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纳米技术
·
光电子学
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DOI
高影响因子
Journal of Physical Chemistry C
·
2023
·
IF 3.7
Bo Zhou,Yasin Muhammad,Dong Ding,Zexiang Liu,Hanlin Hu,Ye Wang,Haizhe Zhong,Yumeng Shi,Henan Li
Multi-ion codoping strategies have been intensively studied for metal halide perovskite optical engineering. Although tunable dual broadband emissions can be achieved by pairing Sb3+/Mn2+ doping centers in metal halide hosts, there have been few reports of highly efficient light emission with a near-unity photoluminescence quantum yield (PLQY). In this study, Mn2+ dopants are incorporated into a Sb3+-doped Rb4CdCl6 system. Tunable dual emissions and a substantial increase in the PLQY from ∼60% to near-unity (98%) are achieved. Energy transfer is strong and localized and occurs only between the Sb3+ donor and the adjacent Mn2+ acceptor. The green self-trapped exciton emission (524 nm) is converted into a red d–d emission (607 nm) without changing the excitation profile. The Sb3+ optical centers without adjacent Mn2+ species maintained their original green emission. Spectroscopic and probabilistic investigations showed that the luminescent and thermally quenched Sb3+ optical centers play identical roles in the energy-transfer process, and nonradiative recombination was successfully inhibited. These findings clarify how Sb3+ and Mn2+ dopants couple in the metal halide host and facilitate the design of high-performance materials that give tunable broadband fluorescence via an energy-transfer process.
研究领域:
材料科学
·
光学工程
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高影响因子
JOURNAL OF LUMINESCENCE
·
2021
·
IF 3.599
Jiamin Xiong,Sheng Cao,Ke Xing,Mingyan Chen,Ruosheng Zeng,Bingsuo Zou,Jialong Zhao
All-inorganic perovskite nanocrystals (NCs) are emerged as promising materials for illumination and display applications due to their excellent luminescent properties. However, the low photoluminescence quantum yield (PLQY) of violet/blue emission and poor stability of NCs restrict their development. Herein, we report an effective strategy for enhanced PLQY and stability of CsPb(Cl/Br) 3 NCs by incorporating Nd 3+ ions. It was found that Nd 3+ ions could be doped into the host perovskite NC lattice which exists in NCs as Nd 3+ . The steady-state and time-resolved PL spectra showed the decrease of the defect state density in doped NCs with the increase of Nd content. The maximum PLQY of the as-prepared Nd 3+ doped CsPbCl 3 NCs was increased up to 58% at the Nd/Pb molar ratio of 3/1. Compared with undoped NCs, the water stability of Nd 3+ doped CsPbCl 3 NCs was significantly improved. The prepared Nd 3+ doped CsPbCl 3 NCs were further post-treated by anion exchange reaction with PbBr 2 at room temperature . The PL of the as-synthesized Nd 3+ doped CsPb(Cl/Br) 3 NCs covered the emission range of 408–503 nm, and the maximum PLQY could reached 93%. This work discourses that Nd 3+ ions can improve the PLQY and stability of blue and violet perovskite NCs, which will promote their practical application.
研究领域:
材料科学
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纳米技术
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光电技术
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高影响因子
ACS Sustainable Chemistry & Engineering
·
2025
·
IF 7.3
Meiqing Yan,Jiapeng Yang,Enrou Mei,Ye He,Zhaoping Chen,Weiwei Huan,Xiaojuan Liang,Weidong Xiang
To address the issues of Pb toxicity and stability in traditional lead halide perovskite materials, this study presented an environmentally benign aqueous-phase synthesis method for the fabrication of a series of high-performance, green-emitting, lead-free organic–inorganic hybrid manganese(II) halide (OIMnHs) materials, (C12H28N)2Mn(1–x)ZnxBr4. Through Zn2+ doping, the optical properties and stability of the materials were significantly enhanced. Notably, (C12H28N)2Mn0.95Zn0.05Br4 exhibited a remarkable photoluminescence quantum yield (PLQY) of 97.2% and narrow-band green emission at 520 nm with a full width at half-maximum (fwhm) of 43 nm. Furthermore, (C12H28N)2Mn0.95Zn0.05Br4@PET composite films, fabricated via a double-layered PET film encapsulation technique, demonstrated exceptional environmental stability, including resistance to air, heat, water, and blue light. Finally, by integrating (C12H28N)2Mn0.95Zn0.05Br4 with commercial K2SiF6:Mn4+ red phosphor, a composite light conversion film was developed, achieving an impressive wide color gamut coverage of 116.73% NTSC 1953 and 86.82% Rec. 2020. Importantly, the aqueous-phase method exhibited excellent scalability, as demonstrated by a successful 20-fold scale-up production without compromising the optical properties or crystal structure of the materials, highlighting its potential for large-scale manufacturing. This study paved the way for the development of high-performance, environmentally friendly, low-cost, and readily scalable lead-free halide materials for wide-color-gamut backlight displays.
研究领域:
材料科学
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光学
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环境科学
·
显示技术
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高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2024
·
IF 18.5
Wenying Zhu,Shun Cheng,Eenrou Mei,Ye He,Jiapeng Yang,Ruowang Liu,Xiaojuan Liang,Weidong Xiang
All-inorganic perovskite quantum dots (PQDs) are widely applied in photoelectronics because of their high luminous efficiency. However, PQDs have poor stability, which hinders their practical applications. In this study, controllable crystallization of PQDs is achieved by adding Al 2 O 3 to alter the glass network. Next, Na 2 CO 3 (aq) washing-heating treatment is used to improve the protective mechanism. Owing to this dual strategy, the prepared CsPbBr 3 @glass exhibits a high photoluminescence quantum yield (PLQY > 95%) and excellent stability. In a 1000 h accelerated aging experiment, the luminous intensity remains above 96% of the initial intensity. The luminescence intensity shows almost no change after soaking in water for 20 weeks. Finally, the CsPbBr 3 @CsPbBr 1 I 2 @PET light-conversion film is prepared by the sandwich method. Its color gamut covers 138% of the NTSC 1953 and 102% of the Rec. 2020. This CsPbBr 3 @glass with a high PLQY and ultrastability will broaden the scope of perovskite materials in displays.
研究领域:
材料科学
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光电材料
·
纳米技术
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高影响因子
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
·
2025
·
IF 4.7
Zhanghe Zheng,Heng Li,Jingxia Zheng,Lei Qin,Lin Chen,Yongzhen Yang,Xuguang Liu
Narrow-bandwidth emissive carbon dots (NBE-CDs) can be well applied in light-emitting diodes (LEDs) owing to their excellent properties such as high color purity, high sensitivity, and high photoluminescence quantum yield (PLQY). Currently, most NBE-CDs achieve high PLQY fluorescence emission in solution, whereas NBE-CDs are susceptible to aggregation-caused quenching in solid state, which leads to a sharp decrease or even disappearance of fluorescence intensity. To achieve narrow-bandwidth solid-state emissive of CDs, in this work, a solution of narrow-bandwidth emissive orange CDs (O-CDs) with a full-width at half-maximum (FWHM) of 49 nm and an absolute PLQY of 83.45 % are synthesized through one-step hydrothermal method by using citric acid as carbon source and rhodamine 6G with inherent narrow FWHM as surface modifier. Subsequently, the O-CDs are dispersed in a polyvinylpyrrolidone (PVP) matrix to form O-CDs/PVP fluorescent films, which retains a narrow FWHM of 49 nm and exhibits a PLQY of 59.4 %, thereby enabling solid-state emission. Combining experimental and theoretical simulations, it is found that the solvent environment plays a critical role in determining the FWHM of O-CDs. Specifically, the FWHM gradually decreases as the proton donating capacity gradually weakens and the degree of dispersion deepens. Finally, high-color-purity photoluminescent LEDs with an FWHM of 49 nm are fabricated by combining the O-CDs/PVP fluorescent films with blue LEDs chips. This work provides both theoretical and experimental foundations for the controllable synthesis of efficient narrow-bandwidth solid-state emissive CDs.
研究领域:
材料科学
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纳米技术
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光电子学
·
光物理
·
固态照明
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高影响因子
INORGANIC CHEMISTRY
·
2022
·
IF 5.436
Yan Zhang,Lei Zhou,Dan Li,Hui Li,Lei Zhang,Wei Shen,Ming Li,Rongxing He
Hitherto, three-dimensional (3D) perovskite single crystals with a low exciton binding energy generally possess inferior photoluminescence (PL) performance due to the spatially unconfined nature of excitons. In this work, 3D CsCdCl3 single crystals with multiple emissions from self-trapped excitons (STEs) have been developed, which unsurprisingly exhibit a discouraging PL quantum yield (PLQY) of ∼4.8%. To improve the luminescence efficiency, Mn2+ and Sn2+ are introduced into the lattice as dopants, respectively. By embedding Mn2+ ion into CsCdCl3, the long Mn–Mn distance enables the resultant material to produce an intense orange emission (∼100% PLQY) from the d–d orbital transition (4T1–6A1) of Mn2+. Intriguingly, the embedded Sn2+ triggers the formation of Jahn–Teller-like STEs that induces a subsequent deep red emission with a PLQY of ∼28.22%, which is quite high for 3D bulk perovskites. Such a remarkable PL efficiency is attributed to the distinctive bonding mode of CsCdCl3 that encourages the expression of the Sn 5s2 lone pair. Furthermore, a white-light-emitting diode (WLED) is also fabricated with Mn2+-doped CsCdCl3 to show its potential in lighting application. This work paves a new avenue to improve the luminescence performance of bulk 3D perovskite materials.
研究领域:
材料科学
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光电
·
光子学
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高影响因子
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