Advanced Optical Materials
·
2024
·Vol. 12
·期 20
·2400184
·
IF 8
Yue Li,Haolin Lu,Rui Yun,Huanxin Yang,Yuling Liu,Zhaoyu Wang,Song Wang,Guankui Long,Xiyan Li
Lead-free perovskites exhibit unique crystal structures and optical properties due to their low-dimensional structure. However, the 0D structure of Cs 2 InCl 5 ·H 2 O usually demonstrates poor optical properties at room temperature due to their extremely strong electron–phonon coupling interaction. In this study, a doping strategy is employed by introducing Pb 2+ into Cs 2 InCl 5 ·H 2 O, resulting in the achievement of an efficient broadband blue emission, with a photoluminescence quantum yield (PLQY) of 58%. The temperature-dependent PL spectra reveal that the efficient emission is attributed to the weakening of the electron–phonon coupling strength in the lattice and the inhibition of the phonon-assisted non-radiative recombination process through Pb 2+ doping. The validity of this deduction is further corroborated by the results of the Raman spectra. The results of the first-principle calculation demonstrate that the broadband emission originates from multiple emission paths in In 3+ and Pb 2+ polyhedrons. In addition, Pb 2+ -doped Cs 2 InCl 5 ·H 2 O can realize the transformation from sky-blue emission to deep-blue emission by absorbing water in the air. Remarkably, this change is reversible during the heating–cooling cycles, demonstrating excellent optical stability with repeatable recyclability.
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 Physical Chemistry C
·
2023
·
IF 3.7
Liang Jing,Qingmei Cen,Qi Pang,Jin Zhong Zhang
In this work, lead-free zero-dimensional (0D) all-inorganic perovskite Mn2+-doped Cs2InCl5·H2O microcrystals (MCs) with introduced Bi3+ ion were synthesized by supersaturation recrystallization at room temperature. The electronic bandgap of the MCs is tuned from ∼5.1 to ∼3.1 eV, and the electronic absorption is enhanced in the 200–400 nm region by Bi3+ incorporation. Upon excitation at 365 nm, the MCs with introduced Bi3+ exhibit strong red emission peaking at 640 nm, which is attributed to the Mn2+ transition (4T1g → 6A1g). Simultaneous Mn2+ and Bi3+ incorporation into Cs2InCl5·H2O shows 60 times enhancement of the 640 nm emission band compared to Mn2+ alone. This PL enhancement is attributed to the energy transfer (ET) from the [BiCl6]3– octahedron, which acts as a UV light absorber and exciton donor, to [MnCl6]4–. In addition, a yellow-light-emitting diode (LED) device based on the Cs2In0.45Bi0.55Cl5·H2O:17%Mn MCs was fabricated and evaluated, showing high color saturation at a drive current of 420 mA and good stability. This study demonstrates a new method for achieving efficient red emission by incorporating ns2 metal ions and Mn ions in 0D lead-free metal halides.
研究领域:
材料科学
·
光电
·
光子学
✓ 已验证
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DOI
高影响因子
Science China-Materials
·
2021
·Vol. 65
·期 3
·764-772
·
IF 8.273
Wei Jun-Hua,Luo Jian-Bin,Liao Jin-Feng,Ou Wei-Tao,Kuang Dai-Bin
Zero-dimensional metal halide perovskites have captured intense research interest owing to their unique optoelectronic properties. Particularly, metal halides with the n s 2 electronic configuration are of great interest owing to the high-temperature sensitivity of their photoluminescence, which could be applied to remote optical thermometry (ROT). Herein, all-inorganic and lead-free halide perovskite Te 4+ -doped Cs 2 InCl 5 ·H 2 O single crystals (SCs) were prepared through the hydrothermal method and showed a strong temperature dependence of photoluminescence lifetime. Upon Te 4+ doping, the nonemissive Cs 2 InCl 5 ·H 2 O SC exhibits a bright orange emission at 660 nm with a wide full width at half maximum of 180 nm. The strong phonon-exciton coupling promotes the formation of self-trapped excitons in the soft lattice of the zero-dimensional Te 4+ -doped Cs 2 InCl 5 ·H 2 O SC. The Te 4+ ions with the 5s 2 electronic configuration endow the Te 4+ -doped Cs 2 InCl 5 ·H 2 O SC with a strong temperature-dependent photoluminescence lifetime. This SC reaches a maximum specific sensitivity of 0.062K −1 at 320 K, thereby showing the potential advantages of indium-based metal halide perovskites in ROT applications.
研究领域:
材料科学
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光学传感
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钙钛矿光子学
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固态化学
✓ 已验证
DOI
高影响因子
INORGANIC CHEMISTRY
·
2024
·
IF 4.3
Maohao Yang,Wanyin Ge,Toshiharu Teranishi
Inorganic metal halides (IMHs) often suffer from severe fluorescence thermal quenching, limiting their application at elevated temperatures. Therefore, the exploration of IMHs exhibiting antithermal quenching (ATQ) behavior is of great importance. In this study, we developed a green synthetic route using a solvent evaporation method to successfully synthesize the 0D IMHs Cs2InCl5(H2O). By precise control over the doping ratios of Sb3+, Yb3+, and Er3+, unique dual-mode emission properties are obtained. As the temperature increases, the compound exhibited downconversion and upconversion luminescence, with relative sensitivity SR-max values of 7.11% K–1 and 1.21% K–1, respectively. Particularly anomalous is the compound’s manifestation of an unconventional ATQ behavior during the upconversion process. In situ structural analysis confirmed that under high-temperature conditions, the 0D Cs2InCl5(H2O) metal halide undergoes structural evolution, transitioning through a Cs3In2Cl9 phase, which is responsible for the ATQ. This study provides experimental evidence for the abnormal ATQ of 0D metal halides, offering new inspiration for the multifunctionalization of 0D metal halides in high-temperature temperature sensing and dual-mode luminescence.
研究领域:
材料科学
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光学
·
温度传感
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MICROCHEMICAL JOURNAL
·
2025
·
IF 5.1
Yao-Wen Yue,Le-Xi Zhang,Quan-Wei Song,Ji-Heng Chai,Yan-Yan Yin,Si-Si Chen,Li-Jian Bie
Recently, halide perovskites (HPs) are considered as rising star materials for humidity sensing beyond their wide applications in the field of optoelectronics. However, the structural instability and toxicity of lead have always limited the application and development of HP materials in electronic devices. In this study, all-inorganic lead-free halide perovskite Cs 2 InCl 5 ·H 2 O (CICH-1) was synthesized by a facile precipitation method at room temperature. Compared with the sample via a harsh hydrothermal method (CICH-2), the CICH-1 perovskite in this work exhibits higher defect density, which brings significant advantages for humidity sensing. In the relative humidity (RH) range of 33%–97%, CICH-1 exhibits good linearity (Adj. R 2 = 0.99), high response (9.1 × 10 3 ), fast response (3 s), small hysteresis (0.89% RH), as well as excellent repeatability and long-term stability. This fine humidity sensing performance enables real-time non-contact monitoring of human finger and breath moisture changes with rapid response-recovery behaviors. This contribution provides a favourable candidate material for humidity detection, and opens up new possibilities for the application of all-inorganic lead-free HPs in sensory devices and further human healthcare.
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产品关联
DOI
高影响因子
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