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
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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
·
医学影像学
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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
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DOI
PubMed
高影响因子
JOURNAL OF RARE EARTHS
·
2025
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IF 7.2
Jingheng Nie,Siqi Li,Chaohong Liao,Xicheng Liu,Yiping Wu,Ziying Zhong,Renping Cao,Bang Lan,Jing Wang
Achieving robust multiband luminescence in metal halide perovskites under blue-light excitation remains challenging due to inefficient energy transfer and weak absorption of lanthanide (Ln 3+ ) ions. Herein, Te 4+ /Ln 3+ (Ln=Er, Ho, Tm, Sm) co-doped Cs 2 NaInCl 6 perovskites were developed as an efficient multiband luminescence material. A unique broadband excitation centered at 435 nm (5s 2 → 5s 1 5p 1 electronic transitions) was introduced through Te 4+ doping, which demonstrates enhanced blue-light compatibility compared to conventional sensitizers such as Sb 3+ /Bi 3+ . Systematic investigations reveal that self-trapped excitons generated in [TeCl 6 ] 2− octahedrons act as efficient energy donors, enabling broadband sensitization of Ln 3+ ions. The optimized Te 4+ /Ln 3+ codoped systems exhibit characteristic multiband emissions spanning both visible and near-infrared (NIR) wavelengths under 435 nm excitation, achieving NIR photoluminescence quantum yields of 10.26% for Te 4+ /Tm 3+ (1223 nm emission) and 9.36% for Te 4+ /Er 3+ (1540 nm emission). These findings establish Cs 2 NaInCl 6 :Te 4+ /Ln 3+ as a versatile optoelectronic platform, combining blue-LED-driven multicolor emission with exceptional stability for practical applications.
研究领域:
材料科学
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光学
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DOI
高影响因子
Journal of Materials Chemistry C
·
2024
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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
·
电子器件
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DOI
高影响因子
Materials
·
2024
·Vol. 17
·期 11
·2530
·
IF 3.1
Guoxue Pan,Mingqing Li,Xiaotong Yu,Yuanhao Zhou,Minghui Xu,Xinxin Yang,Zhan Xu,Qianli Li,He Feng
A series of lead-free Rb2ZrCl6:xTe4+(x= 0%, 0.1%, 0.5%, 1.0%, 2.0%, 3.0%, 5.0%, 10.0%) perovskite materials were synthesized through a hydrothermal method in this work. The substitution of Te4+for Zr in Rb2ZrCl6was investigated to examine the effect of Te4+doping on the spectral properties of Rb2ZrCl6and its potential applications. The incorporation of Te4+induced yellow emission of triplet self-trapped emission (STE). Different luminescence wavelengths were regulated by Te4+concentration and excitation wavelength, and under a low concentration of Te4+doping (x≤ 0.1%), different types of host STE emission and Te4+triplet state emission could be achieved through various excitation energies. These luminescent properties made it suitable for applications in information encryption. When Te4+was doped at high concentrations (x≥ 1%), yellow triplet state emission of Te4+predominated, resulting in intense yellow emission, which stemmed from strong exciton binding energy and intense electron-phonon coupling. In addition, a Rb2ZrCl6:2%Te4+@RTV scintillating film was fabricated and a spatial resolution of 3.7 lp/mm was achieved, demonstrating the potential applications of Rb2ZrCl6:xTe4+in nondestructive detection and bioimaging.
研究领域:
材料科学
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光学工程
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医学影像
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DOI
PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2022
·
IF 9.965
Xiang Li,Zhiwei Wang,Hongcan Sun,Fuquan Bai,Shuhong Xu,Chunlei Wang
Since traditional fluorescent materials are too easily observed by the eyes just under the UV light, off-on fluorescent materials are explored as the new generation of fluorescent labels. In the “off” state, such off-on fluorescent labels cannot be observed by naked eyes under either natural light or UV light. Only after a specific decryption treatment to make the fluorescent materials turning into the “on” state, the fluorescent labels can be observed under the UV light. Up to now, it is still a challenge to prepare fluorescent inks with aforementioned ideal properties by using halide perovskite materials. Herein, we reported the first example of Te 4+ doped indium halide perovskite inks with both off-on fluorescence under solvent stimuli and invisible ink color by the naked eyes. The synergistic effect of doping/undoping of Te 4+ together with the reversible phase transformation between Cs 2 InCl 5 (H 2 O) and Cs 3 InCl 6 under solvent stimuli is key for the off-on fluorescence of crystals. Under acid solvent, the substitutional doping of Te 4+ during the process of phase transformation from Cs 3 InCl 6 to Cs 2 InCl 5 (H 2 O):Te 4+ gives rise to “turning-on” orange emission from Te-induced self-trap emission (STE). Under the stimuli of methanol, the dissolution of Te 4+ from the crystals destroys the structure of Te 4+ in ligand-field and results in “turning-off” Te-induced emission during the process of phase transformation from Cs 2 InCl 5 (H 2 O):Te 4+ to Cs 3 InCl 6 . On the basis of the Te 4+ doped indium halide perovskite , printable and colorless ink can be prepared for the confidential information encryption and decryption. Since the mixture of Cs 3 InCl 6 crystals and TeCl 4 have no absorption in visible light scope, the printed encrypted information by such off-state fluorescent ink is colorless and invisible by the naked eyes under either ambient light or UV light. After decryption by acid solvent stimuli, the resulted Cs 2 InCl 5 (H 2 O):Te 4+ doping crystals have a large Stokes shift with absorption below 450 nm from the excitation of Te 4+ in ligand-field and emission around 570 nm from Te-induced STE. It makes the decryption information still colorless and invisible by the naked eyes under the ambient light but visible and readable under the UV light. In comparison to traditional undoped CsPbBr 3 /CsPb 2 Br 5 perovskites with small Stokes shift and eye-visible ink color, the current colorless Te 4+ doped indium halide perovskites are no doubt providing better security level for both encrypted and decrypted information.
研究领域:
材料科学
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光学
·
化学
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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
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DOI
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
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DOI
高影响因子
Laser & Photonics Reviews
·
2024
·
IF 9.8
Jianglong Chang,Yichao Wang,You Li,Yuefeng Gao,Hongquan Yu,Yongze Cao,Xizhen Zhang,Baojiu Chen,Sai Xu
Fluorescence thermometry has garnered significant attention for its noninvasive, remote, highly sensitive, and rapid temperature measurement capabilities. However, achieving superior sensitivity at high temperatures remains a persistent challenge. Herein, a series of Rb 2− x Cs x HfCl 6 : y%Te 4+ perovskites are synthesized to investigate the impact exerted by A-site regulating regarding the luminescence efficiency and temperature-responsive capabilities. Te 4+ doping significantly enhances luminescence intensity, with the broadband yellow light resulting from electron–phonon coupling within the soft lattice, driven by self-trapped exciton emission. Furthermore, A-site regulation demonstrates that increasing Cs⁺ content induces enhanced Jahn–Teller distortion, thereby boosting luminescence efficiency. However, the pure Rb sample exhibits the lowest thermal activation energy, as the temperature rises, increased phonon-exciton coupling and the defect activity accelerate the nonradiative recombination, drastically decreasing fluorescence lifetime by two orders of magnitude from 300 to 390 K. Utilizing this exceptional thermal sensitivity, a lifetime-based fluorescence thermometer is developed, attaining a breakthrough relative sensitivity reaching 20.69% K −1 at 390 K, with high repeatability across multiple heating and cooling cycles. Additionally, a high-temperature warning system for lubricating oil pipelines is designed, demonstrating robust monitoring capabilities. This work offers a new perspective on developing highly sensitive thermometers that utilize halide perovskites for high-temperature applications.
研究领域:
材料科学
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光学
·
测温学
·
化学
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产品关联
DOI
高影响因子
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