JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Xueguo Li,Hao Liang,Changbo Zheng,Chunxiang Zhao,Songchao Bai,Xueqing Zhao,Hao Zhang,Yongsheng Zhu
Lead-free halide double perovskites are widely used for phosphors converted light emitting diode (pc-LED) devices. However, it remains a challenge to modulate their spectra to meet different application requirements. Herein, Cs 2 NaInCl 6 :Sb 3+ double perovskite crystals with excellent blue emission of self-trapped excitons (STEs) were prepared and a lanthanide ions (Ln 3+ ) doping strategy was employed to enable multicolor emissions in this system. The emission colors can be continuously adjusted in a wide range by altering the Ln 3+ ions doping levels. Especially, white light emissions with tunable correlated color temperature were obtained in Tb 3+ , Ho 3+ ions codoped samples. Outstanding photoluminescence quantum yields of the samples are ascribed to the sensitization effect of Sb 3+ ions and the efficient energy-transfer from STEs to Ln 3+ ions. LED devices were further fabricated to demonstrate the great application potentials of the prepared phosphors. These findings provide deep insights for the designing of multicolor double perovskite phosphors.
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
OPTICAL MATERIALS
·
2026
·
IF 4.3
Guiyuan Liu,Wannan Dai,Ziyue Wang,Xiaotian Lu,Ying Ma
Metal halide perovskite (MHP) nanocrystals (NCs) exhibit outstanding optoelectronic properties, making them promising candidates for light-emitting diodes (LEDs). However, their practical application is severely hindered by poor environmental stability. Specifically, violet-emitting CsPbCl 3 NCs suffer from low luminescence properties because of deep-level trap-mediated non-radiative recombination. Here, we report a core-shell structure in which a CsPbCl 3 NC is epitaxially coated with a Cs 2 NaInCl 6 double perovskite shell via a hot-injection method. The resulting CsPbCl 3 @Cs 2 NaInCl 6 heterostructures feature type-I band alignment, enabling effective surface defect passivation and strong charge carrier confinement within the CsPbCl 3 core. As a result, the photoluminescence quantum yield (PLQY) of CsPbCl 3 NCs increases dramatically from 4.4% to 49.5%, accompanied by a prolonged photoluminescence lifetime and a narrower emission spectral full width at half maximum (FWHM). Beyond luminescence enhancement, the Cs 2 NaInCl 6 shell imparts remarkable resistance against damage from water, UV irradiation, and heat. Furthermore, the same encapsulation strategy significantly improves the stability of Mn and Ni-doped CsPbCl 3 (CsPbCl 3 :Mn and CsPbCl 3 :Ni) NCs. This work provides an effective strategy to simultaneously enhance luminescence performance and environmental stability of CsPbCl 3 NCs through passivation with a double perovskite shell.
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry C
·
2024
·
IF 5.7
Shuai Li,Chunrong Zhu,Jinjiang Wang,Zheling Zhang,Dongjie Wang,Yiwen Chen,Doudou Zhang,Jing Wang,Jian Zhang
The broad-band self-trapped exciton (STE) emission feature of lead-free halide double perovskites makes it challenging to realize emission with various wavelengths in a single material. Cs2NaInCl6:Sb3+ crystals with blue emission (440 nm) were synthesized by rationally introducing the Sb3+ ion into Cs2NaInCl6 with a photoluminescence quantum yield (PLQY) up to 99.35%. The Ln3+ (Tb3+ and Ho3+) ions were doped into Cs2NaInCl6:Sb3+ to achieve spectrally tunable emission from blue to green and pink emission owing to the energy transfer from the host STE to Ln3+ ions, with PLQY values of 90.68% and 61.87%, respectively. By carefully adjusting the doping level of Ln3+ ions, white light emission with a PLQY of 68.87% was achieved in the Tb3+ and Ho3+ co-doped Cs2NaInCl6:Sb3+ system. LED devices based on Sb3+/Ln3+ co-doped Cs2NaInCl6 with multicolor and white light emissions were fabricated based on these phosphors, which exhibit excellent spectral and environmental stability. The results show that double perovskite luminescence materials have potential for application in solid-state lighting and multi-color displays.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Nano Materials
·
2026
·
IF 5.8
Chenglin Wang,Yibo Wang,Hanyang Li,Gaozhao Chen,He Liu,Wentao Hao,Fazl Ullah,Qiuyun Ouyang
Abstract To address intrinsic parity-forbidden transitions, strong electron-phonon coupling, and defect-assisted nonradiative recombination in Cs2NaInCl6 nanocrystals, K-doped Cs2NaInCl6:xK+ (x = 0−1) nanocrystal powders were synthesized via a hot-injection method. The powders were dispersed in methyl methacrylate to prepare organic glasses. The x = 0.2 sample exhibits the best performance. Nonlinear absorption was evaluated by open-aperture Z-scan measurements. Both undoped and K+-doped nanocrystals exhibit a transition from saturable absorption to reverse saturable absorption with increasing excitation energy. K+ doping significantly enhances the nonlinear absorption response. At 50 μJ, the nonlinear absorption coefficient of the K+-doped nanocrystals reaches 40 cm·GW−1, approximately 4.2 times that of the undoped nanocrystals (9.5 cm·GW−1). Meanwhile, the optical limiting threshold decreases from 4.69 to 3.53 J·cm−2. This enhancement is attributed to reduced nonradiative loss and prolonged excited-state lifetime induced by K+ incorporation, thereby facilitating carrier accumulation and strengthening excited-state absorption. In addition, the (Cs2NaInCl6:0.2K+)6/poly(methyl methacrylate) organic glass retains 97.14% of its initial nonlinear absorption response after five months. These results demonstrate that K+ doping is an effective strategy for regulating the nonlinear absorption performance of lead-free double perovskites and provide insights into the design of high-performance optical limiting and laser protection materials.
✓ 已验证
DOI
高影响因子
RARE METALS
·
2025
·
IF 11
Hu Bao-Ye,Zhang Wei-Qiang,Zhao Guang-Jiu,Rosei Federico,Zhang Xian-Xi,Zhao Jin-Sheng,Xu Long-Jun,Chu Ya
Lead-free halide double perovskite-based white light-emitting diodes (WLEDs) have recently emerged as promising candidates for advanced lighting technologies. However, their inherent characteristics, such as indirect bandgaps and forbidden electronic transitions, significantly limit photoluminescence (PL) efficiency, posing critical challenges to their widespread application. Herein, we selected highly efficient blue-emitting Cs 2 NaInCl 6 :Bi 3+ nanocrystals (NCs) as a matrix, into which lanthanide ions (Ln 3+ ) were incorporated by ion doping, yielding a series of Ln 3+ -doped perovskite NCs, Cs 2 NaInCl 6 :Bi 3+ ,Ln 3+ (Ln 3+ = Eu 3+ , Tb 3+ and Dy 3+ ), with an impressive photoluminescence quantum yield (PLQY) of 85.1%. Doping with Ln 3+ effectively regulates the optical bandgap and PL efficiency of these materials. Femtosecond transient absorption (fs-TA) spectroscopy reveals changes in self-trapped exciton (STE) dynamics and reduced deep trap-related states upon Ln 3+ doping, indicating effective modulation of self-trapping and defect passivation. The lead-free halide double perovskite-based WLED devices were demonstrated by coating the highly fluorescent green-emissive Cs 2 NaInCl 6 :Bi 3+ ,Tb 3+ NCs with red-emitting (Sr, Ca)AlSiN 3 :Eu phosphor on a commercial ultraviolet (UV) chip, achieving a color-rendering index (CRI) of 87.5 and a correlated color temperature (CCT) of 5723 K. This study is laying a theoretical foundation for the regulation of the optical properties of lead-free halide double-perovskite NCs and defining an ideal model for the development of efficient WLEDs. Graphical We developed a family of Ln 3+ -Bi 3+ co-doped NCs, Cs 2 NaInCl 6 :Bi 3+ ,Ln 3+ (Ln 3+ = Eu 3+ , Tb 3+ , Dy 3+ ), with multicolor luminescence and excellent stability. The luminescence mechanism revealed energy transfer from Bi 3+ to Ln 3+ and achieved efficient self-trapping excitation emission of these materials. WLED device was fabricated using green emissive Cs 2 NaInCl 6 :Bi 3+ ,Tb 3+ NCs (PLQY = 85.1%) with excellent optical stability.
研究领域:
材料科学
·
光电子学
·
纳米材料
·
固体化学
·
照明技术
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry C
·
2022
·Vol. 10
·期 29
·10609-10615
·
IF 8.067
Huwei Li,Long Tian,Zhan Shi,Yao Li,Chengyu Li,Jing Feng,Hongjie Zhang
Lead-free double perovskite (DP) nanocrystals (NCs) with low-toxicity and good stability have attracted attention for light-emitting device (LED) applications. However, low photoluminescence quantum yields (PLQYs) limit their development. Here, we synthesized Tb3+,Sb3+ co-doped Cs2NaInCl6 NCs using an improved hot-injection method. The as-prepared Cs2NaInCl6:Sb,Tb NCs exhibit dual-emission from self-trapped excitons (STEs) to Tb3+ ions. The maximum PLQY of Cs2NaInCl6:Sb,Tb NCs is 74%, which exceeds that of most lead-free DP NCs. The energy transfer channel from STEs to Tb3+ ions in Tb3+,Sb3+ co-doped Cs2NaInCl6 NCs has been proved and studied. In addition, we further introduce Mn2+ ions and fabricate the corresponding warm white light-emitting diodes (WLEDs). This work provides a reliable way to realize DP NCs with enhanced photoluminescence properties and further promoted their development for WLED applications.
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
ADVANCED FUNCTIONAL MATERIALS
·
2024
·
IF 18.5
Gaoqiang Li,Shanshan Cheng,Xu Chen,Meng Wang,Fei Zhang,Zhipeng Chen,Yurun Liang,Xu Li,Huifang Ji,Dongwen Yang,Yanbing Han,Xinjian Li,Wen Xu,Mochen Jia,Chongxin Shan,Zhifeng Shi
Self-trapped excitons (STEs) of lead-free perovskites have aroused tremendous interest in remote optical thermometry due to strong exciton–phonon coupling and large Stokes shifts. Herein, a bright multimodal and multiplexed optical thermometer is constructed with high sensitivity ( S r ) and self-calibrating ability based on Cs 2 NaInCl 6 :Er 3+ double perovskite, allowing for fast and simplified reading via mobile devices. Intriguingly, Er 3+ doping not only shows the characteristic green emissions but also introduces nanoelectronic domains through a new localized valance band maximum and breaks the symmetry of In 3+ site, which facilitates the generation of more STEs. The temperature-sensitive blue emission of STEs and temperature-insensitive green emission of Er 3+ endow multimodal optical thermometry including time-resolved and ratiometric readout schemes with a maximum S r of 3.8% K −1 , where an upconversion primary thermometry serves as a reference to calibrate other modes. Meanwhile, the designed thermometers show robust photostability, repeatability, and structural stability for long-time working and storage. In addition, the remarkable thermochromic phenomenon from blue to green enables a quick color-multiplexed thermography on a smartphone, which is utilized to capture real-time 2D thermal imaging of microelectronic devices. This work demonstrates the great potential of lead-free double perovskite for low-cost and portable optical thermometry.
研究领域:
材料科学
·
光学
·
纳米技术
·
测温学
·
光子学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2024
·
IF 11.2
Zhuo Li,Nan Yang,Shiqin Ding,Ziwang Zhang,Weijie Huang,Zhibin Ye,Meihua Zhao,Jianxin Shi
Inorganic lead-free double perovskites have the advantages of low toxicity, broadband emission, and good stability, which make them promising luminescent materials for lighting applications. However, due to the limited regulation of their self-trapped exciton emission, it is still greatly challenging to achieve white light emitting from a single double perovskite host. Herein, efficient and tunable white light is realized in Cs 2 NaInCl 6 : Sb 3+ , Tb 3+ , Sm 3+ double perovskite by controlling the ratios of the doped three ions with blue, green, and red emissions, respectively. The steady-state and transient fluorescence spectra of singly- and doubly-doped double perovskites reveal the existence of multiple energy transfer channels in the triply-doped phosphors, including from Sb 3+ to Tb 3+ , Sb 3+ to Sm 3+ , and Tb 3+ to Sm 3+ . Benefiting from these channels, the color coordinates of the triply-doped phosphors can cross the whole white light area of the CIE chromaticity diagram by adjusting the ratios of the three dopants , and the maximum internal quantum yield of the white light phosphors is 66.61 %. The white emission phosphors show the characteristic of being independent of excitation wavelength within 310–360 nm. Furthermore, the emission intensity at 430 K of the white light phosphor Cs 2 NaInCl 6 : 0.01Sb 3+ , 0.65Tb 3+ , 0.20Sm 3+ remains 50 % of that at room temperature. A WLED device fabricated with the phosphor and a 365 nm LED chip exhibits a high color rendering index of 90.9, correlated color temperature of 5469 K, and CIE coordinates of (0.333 and 0.328). The results indicate that the as-prepared double perovskite materials are promising candidates in the solid-state lighting field.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry C
·
2025
·
IF 5.1
Hui Xie,Hui Fu,Zhentao Du,Linjie Tong,Jinliang Jiang,Xue Jiang,Jialong Zhao,Weiyou Yang,Jinju Zheng
The increasing need for simultaneous detection of multiple components and precise analysis has driven the search for high-performance, broadband-emitting near-infrared (NIR) materials. Herein, the Cr3+-doped Cs2NaInCl6 (CNIC) lead-free double perovskites (DPs) are fabricated by a hydrothermal approach. The as-synthesized DPs exhibit a remarkable photoluminescence quantum yield (PLQY) of 92.41%, with a broad emission spectrum centered at 960 nm and a full width at half maximum (FWHM) of 160 nm. This exceptional performance is attributed to the Cr3+ ions with the spin-allowed 4T2 → 4A2 transition in a weak crystal field. The CNIC: Cr3+ DPs demonstrate not only excellent air and thermal stability but also impressive photostability. Furthermore, Cr3+/Ln3+ (Ln3+ = Ho3+, Tm3+, and Er3+) co-doped CNIC DPs are employed to achieve multi-peak emissions from NIR Ⅰ to NIR Ⅱ by facilitating energy transfer from Cr3+ to Ln3+. The optimal PLQYs of the co-doped DPs are found to be 69.34% (Ho3+ emission: 14.67%), 79.94% (Tm3+ emission: 31.95%), and 71.07% (Er3+ emission: 25.88%), respectively. These co-doped DPs have been successfully incorporated into high-performance NIR phosphor-converted light-emitting diodes (NIR pc-LEDs), with promising applications in synchronous multi-substance analysis, biological detection, and food safety monitoring, highlighting their potential for multifunctional applications.
✓ 已验证
产品关联
DOI
高影响因子
APL Materials
·
2024
·Vol. 12
·期 6
·
IF 5.3
Li Cheng,Yu Yang,Han Peigeng,Zhou Wei,Li Hui,Lu Ruifeng
Lead-free halide double perovskites (DPs) have been regarded as a class of environmentally friendly and promising optoelectronic materials. Herein, we report the synthesis, luminescence properties, and optoelectronic applications of lanthanide (Ln = Yb 3+ /Er 3+ )/M (M = Bi 3+ /Sb 3+ /Mn 2+ ) codoped Cs 2 NaInCl 6 single crystals (SCs). The Yb/Er codoped Cs 2 NaInCl 6 SCs show upconversion and downshifting visible/short-wave infrared (SWIR) photoluminescence emission. After further introduction of Sb 3+ /Mn 2+ ions into the host, bright blue and red emissions are observed with the PLQYs of 96.28% and 21.58%, respectively. With the incorporation of Bi 3+ ions, the upconversion and visible/SWIR luminescence intensities of Yb/Er/Bi codoped Cs 2 NaInCl 6 SCs are significantly enhanced. The incorporation of Bi 3+ dopant in the DP host can construct a more efficient energy transfer process, resulting in excellent luminescence efficiency. The multi-ion codoped DP system exhibits great potential for optoelectronic applications in the fields of anticounterfeiting, photodetector, and x-ray imaging. This work will help guide the design and development of environmentally friendly multi-functional materials.
研究领域:
材料科学
·
光电技术
·
纳米技术
·
光子学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）