OPTICAL ENGINEERING
·
2023
·
IF 1.3
Jie Zheng,Xian Wu,Wenkai Zhang,Jiahao Cheng,Ke Liu,Guijie Liang,Xin Zhang,Jingyang Wang,Yating Zhang,Qingsong Hu
In recent years, lead-free metal halide luminescent materials have attracted extensive attention because of their excellent properties including but not limited to good environmental compatibility, ultrawide emission band, and high photoluminescence quantum yield. They are considered to have great application potential in the photoelectric field. We modified the previously reported synthesis and prepared pure phase Cs2SnCl6 : Bi3 + , Te4 + using simple solution method. Then the emitter was further coated with polysiloxane to form polysiloxane luminescent ceramic (PSOLC). The prepared PSOLCs have almost the same luminescence as the powders, and their color coordinates and color temperature can be tuned freely by adjusting the ratio of blue and yellow emission, which both encourage outdoor-lighting application. Additionally, they are demonstrated to support flexible luminescence and show highly improved machinability. To test their performance in practical application, we apply the PSOLCs to safety identification board and finally get a satisfactory result, directly indicating that the PSOLCs prepared from lead-free perovskite are quite suitable for flexible-lighting-related display applications.
研究领域:
材料科学
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光学工程
✓ 已验证
产品关联
DOI
高影响因子
Surfaces and Interfaces
·
2024
·
IF 5.7
Wanying Wu,Jieni Ning,Zhengheng Li,Chaoyang Lei,Qiuxue Jian,Chenzhang Gu,Zhiyao Zhou,Binli Xiao,Sheng Wu,Yinzhen Wang
Te doped Y 3 Al 5 O 12 blue-emission nanophosphors were successfully fabricated by the sol-gel method. The effects of Te doping on the structure, morphology, valence state and luminescence properties of samples were investigated using XRD, SEM, XPS and PL techniques. The results demonstrate that all diffraction peaks are in line with pure Y 3 Al 5 O 12 phase. SEM images exhibit that the prepared samples possess a uniform grain size and nearly spherical shape. The YAG:2 %Te 4+ powder sintered at 900 °C shows intense blue emission at 467 nm under 280 nm excitation, with a lifetime of 2.36 μs. These findings suggest that YAG:Te 4+ powders hold significant potential as suitable candidates for NUV-LED applications.
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
·
2024
·
IF 5.7
Mengyao Wang,Xiaofei Qing,Tianyun Du,Chuanli Wu,Xiuxun Han
The rising demand of X-ray imaging technologies in medical radiography and nondestructive detection calls for novel scintillator materials particularly with effective cost, high resolution, and low detection limit. Here we reported the investigations on the scintillating behavior of vacancy-ordered double perovskite Cs2SnCl6 fabricated via a simple co-precipitation process. By introducing Te4+ doping, an intense yellow emission was achieved upon X-ray radiation. Combined with PDMS, flexible imaging screens with tunable size and thickness could be obtained, and demonstrated a high resolution of 20 LP mm-1, low detection limit of 132 nGyair/s, and high X-ray radiation endurance. Its excellent flexibility enables clear and less vignetting X-ray imaging for nonplanar subjects. The findings open a new avenue towards versatile applications for Sn-based vacancy-ordered double perovskites other than visible and near-infrared emissions.
研究领域:
材料科学
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医学影像学
✓ 已验证
产品关联
DOI
高影响因子
Inorganic Chemistry Frontiers
·
2024
·Vol. 11
·期 8
·2457-2470
·
IF 6.1
Ruxin Liu,Kaishun Zou,Guanglu Zhang,Min Feng,Mingxuan Li,Juncheng Liu
Vacancy-ordered double perovskites (VODPs) have attracted much attention because of their excellent photoelectric properties. However, the competition mechanism of self-trapped exciton emission and Te4+ ion emission in Te4+-doped VODPs is still unclear. Herein, we synthesized Rb2HfCl6 microparticles with a blue self-trapped excitons (STEs) emission, which have a near-unity photoluminescence quantum yield (PLQY), the highest reported value (98.56%) for a VODP matrix. In addition, it has a new broadband yellow emission peak at 560 nm with a PLQY of 76.72% via the equivalent doping of Te4+ ions. The combination of the blue luminescence of pristine Rb2HfCl6 with the yellow luminescence from the Te4+ ion emission could be used in fluorescence anti-counterfeiting. We also prepared a white light-emitting diode (WLED) with the Commission Internationale de l'Eclairage (CIE) coordinates at (0.3502, 0.3527), a correlated color temperature (CCT) of 4814 K and a color-rendering index (CRI) of 75.3. Moreover, optimized Rb2HfCl6:Te4+ exhibited excellent air and thermal stability. The luminescence dynamics and theoretical calculations jointly reveal that this efficient emission originates from the electron transitions in the different paths. This work provides a new perspective and new theoretical support for the future research on ion-doped luminescent systems.
研究领域:
材料科学
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光学
·
物理化学
✓ 已验证
产品关联
DOI
高影响因子
Materials Chemistry Frontiers
·
2021
·Vol. 5
·期 13
·4997-5003
·
IF 6.482
Jun Zhou,Ximing Rong,Maxim S. Molokeev,Yulong Wang,Xiangyan Yun,Denghui Xu,Xiong Li
Doping or alloying in perovskites and perovskite variants provides a promising way for modulating the electronic and photoluminescence properties and the structural stability. In this work, a series of yellow-emitting Rb2−xCsxZrCl6:Te4+ solid solution phosphors were prepared by a hydrothermal method, and their broad emission is assigned to the triplet 3P1–1S0 self-trapped excitons (STEs). Upon increasing the alloying ion Cs+, the yellow emission can be greatly enhanced by a stronger Jahn–Teller distortion. Moreover, Cs2ZrCl6:Te4+ shows a high photoluminescence quantum yield (PLQY), and impressive thermal and anti-water stability. This doping–alloying strategy presents a new direction towards designing lead-free, high-performance and stable perovskite derivatives.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2024
·Vol. 48
·期 27
·12342-12347
·
IF 2.7
Yu Qi,Chengyue Xin,Wenjun Zhang,Zhongfa Li,Zihan Chen,Zhongyu Duan
Te4+-doped Cs2ZrCl6 vacancy-ordered perovskites with excitation wavelength-dependent tunable color have been synthesised by a simple precipitation method at room temperature, with two luminescent centres originating from the Te4+ and the STE (self-trapping exciton) of the Cs2ZrCl6 itself, respectively. They exhibit two different emission characteristics at 254 nm and 365 nm excitation wavelengths. At an excitation wavelength of 254 nm, the emission characteristics allow Te4+-doped Cs2ZrCl6 to exhibit tunable emission from blue to white to yellow under the control of Te4+ doping. And the excitation wavelength of 365 nm shows yellow emission. Te4+ doped Cs2ZrCl6 phosphors were used for optical anti-counterfeiting, and the anti-counterfeiting patterns were well distinguished under 254 nm and 365 nm UV lamps, demonstrating the potential of this excitation wavelength-dependent tunable color material for optical anti-counterfeiting applications.
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
·
2024
·
IF 5.7
Hao Song,Junheng Yuan,Lulu Han,Dedan Mu,Xuhui Xu,Peng Zhang
Ratiometric and lifetime-technology temperature measurement are prominent techniques in the field of optical thermometry due to their advantages of visual detection and high sensitivity in temperature precision, respectively. However, the integration of both temperature measurement advantages is only effectively achievable with large-scale equipment, which restricts the application of multimode optical thermometry in everyday scenarios. Herein, the Te4+-doped halide perovskite single crystal Rb2InCl5·H2O:0.5%Te4+ has been demonstrated to function as a dual-mode optical temperature sensor and has been further developed into a portable temperature measurement indicator light. The rapid decay of the Te4+ lifetime results in a high relative sensitivity (Sr) of 14.65% K-1 between 300 K and 350 K. Under blue light excitation, the differing temperature-dependent behaviors of the host ions and Te4+ enable the ratio mode temperature sensor, with luminescence color transitioning from orange-red to white. Using its high sensitivity and color-changing capabilities within the temperature range of 300 K to 350 K, it is integrated into mobile power supplies to realize both precise temperature measurements of everyday electronic devices in lifetime mode and visual temperature monitoring through the color-changing temperature indicator light in ratio mode. As the same time, the synthesis of this single crystal results in enhanced temperature and humidity stability, thereby prolonging its service life. This research offers insights for the design of perovskite dual-mode optical thermometers and paves the way for portable temperature measurement.
研究领域:
材料科学
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光学工程
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电子器件
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry C
·
2021
·Vol. 10
·期 1
·204-209
·
IF 7.393
Xiaoxia Liu,Chengdong Peng,Lijie Zhang,Daying Guo,Yuexiao Pan
As an all-inorganic zero-dimensional (0D) lead-free metal halide, Cs2ZnCl4 is a potentially excellent matrix for preparing chemically stable and environmentally friendly photoluminescent materials through an ion-doping strategy. Therefore, it is necessary to study the emission properties of every kind of doping ion in the tetrahedral coordination of Cs2ZnCl4. Here, for the first time, we successfully synthesized Te4+-doped Cs2ZnCl4 single crystals via a facile hydrothermal method. X-ray crystallography clearly reveals the strong distortion of the tetrahedral units in Cs2ZnCl4 caused by doping with Te4+. Broadband yellow-light emission covering the range from 450 nm to 700 nm with a large Stokes shift is observed in Cs2ZnCl4:Te4+ single crystals, and this is attributed to self-trapped excitons (STEs) caused by the lattice vibration of the distorted structure. It is worth mentioning that this broadband yellow phosphor can be excited by a wide range of blue light, implicitly giving it an excellent ability to adapt to multiple models of blue LED chips, thus serving as a suitable yellow phosphor that can be applied to fabricate WLEDs without the need to worry about the lack of red light.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
INORGANIC CHEMISTRY
·
2024
·
IF 4.3
Lei Zhou,Shuigen Zhou,Xiaowei Liu,Junhao Ma,Ting Zhang,Kailei Li,Yuanyuan Chang,Wei Shen,Ming Li,Rongxing He
Low-dimensional lead-halide hybrids are an emerging class of optical functional material but suffer the problems of toxicity and poor air stability. Among lead-free metal halides, tin(IV)-based metal halides are promising optoelectronic materials due to their robust structure and environmental friendliness. However, their photoluminescence (PL) properties are poor, and the underlying mechanisms are still elusive. Herein, a stable Sn4+-based halide hybrid, (C4H7N2)2SnCl6, was developed, which however exhibits poor PL properties at room temperature (RT) due to the lattice defects and the robust crystal structure. To enhance its PL efficiency, the Te4+ ion with a stereoactive 5s2 lone pair has been introduced into the lattice. As a result, Te4+-doped (C4H7N2)2SnCl6 displays broadband orange emission (∼640 nm) with a PL efficiency of ∼46% at RT. Interestingly, Te4+-doped (C4H7N2)2SnCl6 shows triple emission bands at 80 K, which could be due to the synergistic effect of the organic cations and the self-trapped state induced by Te4+. Additionally, high-performance white light-emitting diodes were prepared using Te4+-doped (C4H7N2)2SnCl6, revealing the potential of this material for lighting applications. This study provides new insight into the PL mechanism of Sn4+-based metal-halide hybrids and thus facilitates the design and development of eco-friendly light-emitting metal halides.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INORGANIC CHEMISTRY
·
2025
·
IF 4.7
Lingkang Yu,Yining Wang,Xiaole Xing,Zheng Xu,Mengmeng Shang
Presently, a multitude of all-inorganic and lead-free metal halide perovskites are chosen as matrices for Cr3+ doping due to their favorable coordination environments, aiming to achieve a near-infrared (NIR) emission. Nonetheless, the acquisition of a more efficient NIR emission remains challenging. Herein, we successfully enhanced NIR luminescence within the Cs2ScCl5·H2O:Cr3+ by codoping Te4+ ions. The weak symmetry of Cs2ScCl5·H2O provides an appropriate crystal environment for the broadband near-infrared emission of Cr3+. The NIR emission from the 4T2 → 4A2 transition of Cr3+ is significantly enhanced due to the energy transfer by the emission of STEs, with a photoluminescence quantum yield (PLQY) of 11.02%. Compared to single doping with Cr3+, the emission intensity of Cs2ScCl5·H2O:Cr3+, Te4+ in the NIR region obtains a 3-fold enhancement, while a new yellow emission is simultaneously obtained. This discovery offers a viable method for achieving efficient NIR emission in lead-free metal halides via codoping with ns2 ions and Cr3+. Additionally, Cs2ScCl5·H2O:Cr3+, Te4+ sample was combined with a 380 nm violet light chip for encapsulation, demonstrating its potential applications in the fields of nondestructive material testing and night vision.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INORGANIC CHEMISTRY
·
2024
·
IF 4.3
Xi Chen,Yuexiao Pan,Yihong Ding,Hongzhou Lian,Jun Lin,Liyi Li
The quest for efficient and tunable luminescent materials has been at the forefront of research in the fields of chemistry and materials science. This work delves into the investigation of the luminescence properties of Er3+ ions triggered by 1% Te4+ in the environmentally benign perovskite Cs2NaYbCl6 (CNYC) crystals, aiming to enhance their efficiency and tune the luminescence color. The ratio of the green (2H11/2, 4S3/2–4I15/2) to red (4F9/2–4I15/2) emissions of Er3+ can be freely tunable by varying the concentration of Er3+ and producing the defects induced by codoping Te4+. The calculations reveal that the multiexcitonic excitations of Er3+ stem from f–f (4I15/2–4G11/2, 2H9/2) rather than d–f transitions. The broadened excitation, tuning of color, and enhancement of efficiency achieved in the luminescence perovskite crystals Cs2NaYbCl6:Te4+, Er3+ (CNYC:Te4+,Er3+) presents promising opportunities for the development of advanced optoelectronic devices with superior performance. Moreover, our investigation demonstrates the tunable luminescence response of CNYC:Er3+ to temperature variations, offering potential applications in temperature sensing.
研究领域:
材料科学
·
光学
·
物理化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF LUMINESCENCE
·
2023
·
IF 3.6
Qing Hu,Huidong Tang,Hezhen Wu,Sihui Pan,Yanqiao Xu,Weihui Jiang,Lianjun Wang,Wan Jiang
Lead-free vacancy‐ordered halide double perovskite microcrystals are new alternatives to lead-based halide perovskite materials for lighting applications; however, they are limited by harsh synthesis conditions and low quantum efficiency. Hence, a facile solution recrystallization method was used to synthesize Te 4+ -doped Rb 2 SnCl 6 phosphors. Via Te 4+ doping, the phosphors show a yellow–green emission at 550 nm and a broadband emission line width of approximately 97 nm, achieving a high photoluminescence quantum yield of 74.2%, arising from the Te 4+ 1 S 0 → 3 P 1 self-trapping exciton transition. The Te 4+ -doped Rb 2 SnCl 6 microcrystals are subsequently used to fabricate a white light-emitting diode device, which shows a high color-rendering index of 97.1 and a correlated color temperature of 4739 K. This work reports a facile method to synthesize alloy double perovskite phosphors, opening up new avenues for the development of environment-friendly lighting applications.
研究领域:
材料科学
·
光电技术
·
照明技术
✓ 已验证
DOI
高影响因子
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