Advanced Photonics Research
·
2022
·Vol. 3
·期 4
·2100289
·
IF 0
Xixi Zheng,Jinxin Huang,Yaoyu Liu,Tianyu Wang,Shiguo Han,Zongqi Wang,Bing Teng,Shaohua Ji
Owing to their excellent photoelectric properties, perovskite materials have broad application prospects; however, the toxicity of Pb limits the application of Pb-based perovskite materials. To overcome this problem, Pb-free perovskite materials are prepared by replacing Pb with nontoxic elements including Ge and Sn; nevertheless, the stabilities of these materials are low. Herein, single crystals of nontoxic Cu(I)-based ternary metal halide (Cs 3 Cu 2 Br 5 ) with outstanding stabilities and self-trapped excition (STE) emission are constructed by an antisolvent method for the first time; these crystals exhibit central blue emission at 458 nm and large Stokes shifts. Photoluminescence (PL) intensities of the single crystals remain above 96.9% of their initial intensities when these crystals are exposed to an atmospheric environment for 90 days. Moreover, the stabilities of the Cs 3 Cu 2 Br 5 single crystals are investigated by temperature-dependent PL spectroscopy, which suggests a considerable exciton binding energy of 503 meV, and derivative thermogravimetric analysis, which indicate that the temperature of complete decomposition of Cs 3 Cu 2 Br 5 is above 930 °C. Furthermore, a new class of white light-emitting diodes with an ultrahigh color rendering index of 97.8 and satisfactory performance is produced using the Cs 3 Cu 2 Br 5 single crystals. The study demonstrates significant potentials of Cu(I)-based single crystals in the field of optoelectronics.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
INORGANIC CHEMISTRY
·
2021
·
IF 5.165
Chen Sun,Qian-Qian Zhong,Xin Zhang,Pan-Chao Xiao,Yu Cheng,Yu-Jia Gao,Guo-Dong Liu,Xiao-Wu Lei
Low-dimensional organic–inorganic hybrid metal halide materials have been extensively studied due to their excellent optoelectronic performances. Herein, by using the facile wet-chemistry method, we designed one new hybrid cadmium bromide of (H3AEP)2CdBr6·2Br based on discrete octahedral [CdBr6]4– units. Remarkably, the bulk crystal of (H3AEP)2CdBr6·2Br exhibits strong broadband orange–red light emission from the radiative recombination of self-trapped excitons (STEs) with a high photoluminescence quantum yield (PLQY) of 9%. Benefiting from the highly efficient luminescent performance, this 0D cadmium perovskite can be utilized as an excellent down-conversion red phosphor to assemble a white light-emitting diode, and a high color rendering index (CRI) of 93 is realized. As far as we know, this is the first orange–red light-emitting hybrid cadmium perovskite which promotes the full-color display in this system.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2022
·
IF 10.383
Shu-Yi Yao,Hao Li,Min Zhou,Tian-Chi Wang,Xue Yu,Yin-Sheng Xu,Jian-Hong Yi,Jian-Bei Qiu,Jie Yu,Xu-Hui Xu
X-rays play an extremely significant role in medical diagnosis, safety testing, scientific research, and other practical applications. However, as the main sources of radioactive pollution, the hazard of X-rays to human health and the environment has been a major concern. Herein, the explored perovskite scintillator of Cs2Zr1–xPbxCl6 in this work exhibits an ultrahigh radioluminescence intensity owing to the enhanced X-ray absorption for the introduction of Pb2+ ions. The Cs2Zr1–xPbxCl6 crystals are demonstrated as efficient scintillators with a self-trapped exciton emission and extremely high steady-state light yield (∼101,944 photons meV–1). This fascinating scintillator provides a convenient visual tool for X-ray detection even for an indoor lighting environment, reaching a low detection limit of ∼14.2 nGy·s–1, which is about 1/387 of the typical medical imaging dose (5.5 μGy·s–1). Moreover, X-ray imaging with a high resolution of 16.6 lp·mm–1 is achieved with the as-explored Cs2Zr1–xPbxCl6 scintillator film. Herein, the Cs2Zr1–xPbxCl6 scintillator provides a feasible strategy for X-ray monitoring in the field of biomedicine, high-energy physics, national security, and other applications.
研究领域:
材料科学
·
医学成像
·
辐射探测
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Ranran Fan,Junpeng Qiao,Jiaxin Xu,Sujuan Feng,Guangqiang Liu
In this paper, the one-dimensional Cs 2 AgI 3 and Cu + -doped Cs 2 AgI 3 single crystals had been synthesized by antisolvent infiltration method. A blue-emission with peak at 473 nm and a large Stokes shift was observed in the Cs 2 AgI 3 single crystals, which might originate from the self-trapped excitons (STEs). Experimental studies revealed that appropriate Cu + dopant greatly enhanced the Cs 2 AgI 3 photoluminescence quantum yield (PLQY). Theoretical calculation confirmed that the optimized Cu + concentration could effectively modulate the electronic band structure , and the electronic states highlighted in CuI 4 tetrahedron showed strong localized characteristic, which was beneficial to improve the luminescence efficiency of the blue band. In addition, this kind of metal halides exhibited strong stability in air ambient. This work supplies a feasible strategy to improve the optoelectronic performance by extrinsic chemical doping and could prompt the commercial application of lead-free metal halides.
研究领域:
材料科学
·
光学
✓ 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
Journal of Materials Chemistry C
·
2025
·
IF 5.1
Chao Tan,Weilong Liu,Wenzhuo Li,Hongbo Qi,Xiaojun Zhu,Zhongfang Ji,Jian Cheng,Wenzhi Wu,Qingxin Yang
Appropriately doped lead-free double perovskites (LFDPs) or vacancy-ordered double perovskites (VODPs) exhibit efficient and stable white-light emission via self-trapped excitons (STEs), and therefore hold significant potential for applications in lighting and display technologies. However, the intrinsic luminescence of the host is often disregarded when studying the doped materials because most LFDPs or VODPs possess indirect bandgaps or parity-forbidden transitions from conduction band to valence band. Here, we report a weak warm white light emission from pure Cs2SnCl6 microcrystals, and attribute this emission to the deep trap state according to the observations of absorption and photoluminescence (PL) spectra. The bandgap and structural characteristics of Cs2SnCl6 were further illustrated by analyzing the absorption, PL, Raman spectra and PL dynamics under variable pressure and temperature conditions. The emission mechanism of the deep trap levels in Cs2SnCl6 microcrystals and their potential impact on the STEs emission were discussed based on the spectroscopic observations.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
Small
·
2023
·Vol. 19
·期 21
·2300862
·
IF 13.3
Hong Zhu,Yuexiao Pan,Chengdong Peng,Yihong Ding,Hongzhou Lian,Jun Lin,Liyi Li
Single-component white light emitters based on the all-inorganic perovskites will act as outstanding candidates for applications in solid-state lighting thanks to their abundant energy states for self-trapped excitons (STE) with ultra-high photoluminescence (PL) efficiency. Here, a complementary white light is realized by dual STEs emissions with blue and yellow colors in a single-component perovskite Cs 2 SnCl 6 :La 3+ microcrystal (MC). The dual emission bands centered at 450 and 560 nm are attributed to the intrinsic STE1 emission in host lattice Cs 2 SnCl 6 and the STE2 emission induced by the heterovalent La 3+ doping, respectively. The hue of the white light can be tunable through energy transfer between the two STEs, the variation of excitation wavelength, and the Sn 4+ /Cs + ratios in starting materials. The effects of the doping heterovalent La 3+ ions on the electronic structure and photophysical properties of the Cs 2 SnCl 6 crystals and the created impurity point defect states are investigated by the chemical potentials calculated using density functional theory (DFT) and confirmed by the experimental results. These results provide a facile approach to gaining novel single-component white light emitter and offer fundamental insights into the defect chemistry in the heterovalent ions doped perovskite luminescent crystals.
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
·
2024
·
IF 3.3
Heng Guo
Low-dimensional metal halides, which possess efficient luminescent properties, have garnered significant interest in the fields of optoelectronics and radiation detection. This study introduces novel lead-free silver-based metal halide material, CsAgCl 2 microcrystals (MCs). These MCs have a one-dimensional atomic chain structure and a unique [AgCl 5 ] 4- tetragonal shared triangular configuration. CsAgCl 2 MCs exhibit excellent performance as X-ray scintillators due to their bright broadband yellow emission and fast decay time in the microsecond range. The large Stokes shift of 350 nm is produced by self-trapped exciton emission. In X-ray scintillation applications, CsAgCl 2 MCs demonstrate a high light yield of 13280 photons/MeV and a wide range of linear scintillation response. It is noteworthy that the CsAgCl 2 MCs maintain good stability under both atmospheric conditions and continuous X-ray irradiation. The sample was used in an X-ray imaging screen, which clearly presented the X-ray projection image of a wooden stick. As a result, this research not only contributes to the collection of lead-free metal halide scintillators but also indicates that CsAgCl 2 MCs have a wide range of future applications and potential in areas such as medical imaging, scientific research, and diagnostic and detection technologies.
研究领域:
材料科学
·
辐射检测
·
医学影像
✓ 已验证
产品关联
DOI
高影响因子
Materials Today Chemistry
·
2022
·
IF 7.613
J. Ding,X. Cui,Q. Ren,Y. Mao,J. Zhang,G. Zhou,X.-M. Zhang
Organic-inorganic metal halides have garnered extensive attention due to their versatile structures as well as fascinating optical properties , among which especially antimony halides are the focus of recent research. Herein, we design a series of novel zero-dimensional (0D) antimony halides of (C 13 H 14 N 3 ) 3 SbCl 6– x Br x ( x = 0, 3, 6) with bright and tunable broadband emissions from yellow (576 nm) to orange (600 nm), which are attributed to the triplet self-trapped excitons (STEs) of the six-coordinated [SbX 6 ] 3– (X = Cl − or Br − ) units. The role of halogens on their specific 3 P 1 → 1 S 0 transition is determined, wherein Cl/Br transmutation reveals a common law modulating photoluminescence behaviors. Furthermore, a new two-step compound technology is innovatively developed for performance optimization, enabling by incorporating the pristine antimony halides into polymethyl methacrylate (PMMA) with high transparency and strong moisture resistance . The composites (C 13 H 14 N 3 ) 3 SbCl 6– x Br x /PMMA ( x = 0, 3, 6) were fabricated through a demanding technology that significantly improve the processability and water stability of antimony halides while maintaining high photoluminescence quantum yields . This work not only proposes a method for halogen substitutions to tune emission, but also opens up a feasible research avenue for performance optimization in the multifunctional luminescence materials.
研究领域:
材料科学
·
光学
·
化学工程
✓ 已验证
DOI
高影响因子
Journal of Physical Chemistry C
·
2023
·
IF 3.7
Hui Wang,Chao Wang,Yanan Wang,Mengjiao Sun,Guangjiu Zhao
In this work, we report a zero-dimensional single-component (0D) (C4H16N3)InBr6 (C4H13N3 (DETA) = diethylenetriamine), which emits white light through a simple mechanochemical method. The blue emission band at 400 nm and the yellow emission band at 550 nm are coupled to give rise to cold white emission. Theoretical calculations and spectra reveal that the photoluminescence of (DETA)InBr6 at 400 and 550 nm is attributed to free exciton and self-trapped exciton emission, respectively. It demonstrates that the nonadiabatic transition from free exciton to self-trapped exciton occurs at the ultrafast scale of <210 fs by a femtosecond transient absorption (fs-TA) measurement. The energy level of the antimony cation is located between the free exciton and the self-trapped exciton state as an “intermediate state”. When doping Sb3+, energy barriers are decreased and the nonradiative recombination process is suppressed, leading to an increase in the photoluminescence quantum yields (PLQY) from 1.40% to 24.12% for (DETA)InBr6:1.5%Sb3+. In addition, the energy level of Sb3+ can facilitate the nonadiabatic transition to a self-trapped exciton, and the free exciton emission disappeared, which results in the transformation from white to yellow emission with 585 nm. These findings not only shed light on the mechanism of indium-based halide perovskite enhanced photoluminescence via an antimony(III) cation, but pave the way for the application of a simple method of mixing organic–inorganic metal halides in solid-state lighting.
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
·
2023
·Vol. 12
·期 4
·1309-1316
·
IF 6.4
Zhichao Liu,Yuexiao Pan,Xiaoxiao Fu,Yihong Ding,Liyi Li
The development of efficient, non-toxic, and cost-effective white-light emitters is crucial for advancing lighting technology. Here, we present a groundbreaking study on a new all-inorganic perovskite crystal, CsCaCl3:Mn2+, which exhibits temperature sensing and hue-tunable white light emission. The CsCaCl3 matrix emits broad blue light at 455 nm due to self-trapped exciton (STE) emission. Upon Mn2+ doping, the CsCaCl3:Mn2+ crystal emits broad yellow light at 555 nm, originating from the Mn2+ 4T1(G)–6A1(S) transition. Increasing Mn2+ concentration led to a decrease in blue emission intensity, accompanied by enhanced yellow emission, suggesting an energy transfer from STEs to Mn2+. The enhanced stability of CsCaCl3:Mn2+ compared to pure CsCaCl3 is demonstrated through thermal analysis. The distinctive temperature-dependent responses of STE and Mn2+ emissions in CsCaCl3:Mn2+ suggest its potential application in temperature sensing. The synthesis process for this luminescent crystal is both straightforward and scalable, making it a promising candidate for large-scale applications.
研究领域:
材料科学
·
光学工程
·
发光材料
✓ 已验证
产品关联
DOI
高影响因子
Advanced Optical Materials
·
2019
·Vol. 7
·期 24
·1901335
·
IF 7.125
Guojun Zhou,Mingze Li,Jing Zhao,Maxim S. Molokeev,Zhiguo Xia
With single-component photoinduced white-light (WL) emission, low-dimensional hybrid halide perovskites have emerged as a new generation of luminescent materials; however, the effect of halogens on the intrinsic light emissions and the corresponding mechanisms is still unknown. Herein, the investigation of a family of two-dimensional (2D) hybrid perovskites R 2 PbBr 4− x Cl x ( R = BA + , PMA + , PEA + ; x = 0, 1, 2, 3, 4) highlights the influence of halogens on intrinsic emission to reveal the dependence of the photoluminescence on the nature and contribution of the halogens. Ultrabroad emissions covering the entire visible-light region are achieved in the halogen hybrid systems with the stoichiometry of R 2 PbBr 2 Cl 2 ( R = BA + , PMA + , PEA + ), showing their potential as single-component WL phosphors in solid-state lighting devices. The origin of the WL emissions is the synergistic recombination emission of free excitons and self-trapped excitons. The ratio of halogens (Br/Cl) is confirmed to be a critical factor to fine-tune the intrinsic emission properties. This work provides a feasible strategy to achieve single-component WL emission in 2D hybrid perovskites, and proposes a method for regulating halogen contents for optimizing luminescent properties.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）