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 ELECTRONIC MATERIALS
·
2024
·
IF 2.2
Cao Yang,Zhang Yong,Wei Wei,Wang Chen,Zhao Xiaoyu,Chen Xudan,Lu Zhenhao
Organic–inorganic metal halides have recently garnered significant interest owing to their excellent photoluminescence performance and high stability. Therefore, a synthetic procedure was designed here to obtain (PPZ)ZnBr 4 (PPZ = 1-phenylpiperazine) nanocrystals (NCs) incorporating Pb 2+ and Sn 2+ ions, obtaining blue and orange light emitters, respectively. Photoluminescence quantum yields of blue and orange emissions were up to 43.2% and 29.9%, respectively, under 365-nm excitation. The prepared NCs also demonstrated long-term stability and humidity resistance. This study not only provided a deep comprehension of low-dimensional perovskites, but also established an avenue for the strategic design of high-performance light-emitting perovskites.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Jie Guo,Qiang Hu,Min Lu,Asu Li,Xiaoyu Zhang,Ren Sheng,Ping Chen,Yu Zhang,Jinlei Wu,Yuhao Fu,Guang Sun,William W. Yu,Xue Bai
One-dimensional (1D) semiconductor nanorods (NRs) are very promising materials for light-emitting diodes (LEDs) due to their unique optoelectronic properties, while the research on 1D perovskite NRs is relatively rare. Herein, the 1D CsCdBr 3 perovskite NRs were synthesized by simple thermal injection method, in which the [CdX 6 ] 4- octahedra sharing opposite faces can form infinite linear chains along the c axis. But their low photoluminescence quantum yields (PL QYs) limit their application in LEDs. To improve the optoelectronic properties of CsCdBr 3 NRs, the PbBr 2 is chosen as the dopant to synthesize the Pb 2+ doped CsCdBr 3 perovskite NRs. When the molar ratio of PbBr 2 :CdBr 2 is 0.25, the perovskite NRs with the PL QYs of 48% and pure-blue emission centered at 459 nm were obtained. Furthermore, the optimized NRs were used as the emissive layer to fabricate a perovskite LED that is the only one blue perovskite LED based on 1D NRs. This device shows bright pure-blue emission with good spectral stability, suggesting that the 1D perovskite NRs are good choice to achieve next-generation lighting and display.
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
Journal of Physical Chemistry Letters
·
2023
·
IF 5.7
Yacong Li,Chuying Wang,Guangyong Xu,Guigen Luo,Zhengtao Deng
The absorption and photoluminescence (PL) of CsMnBr3 with Mn(II) in octahedral crystal fields are extremely weak due to a d–d forbidden transition. Herein, we introduce a facile and general synthetic procedure that can prepare undoped and heterometallic doped CsMnBr3 NCs at room temperature. Importantly, both PL and absorption of CsMnBr3 NCs were significantly improved after doping a small amount of Pb2+ (4.9%). The absolute photoluminescence quantum yield (PL QY) of Pb-doped CsMnBr3 NCs is up to 41.5%, 11-fold higher than undoped CsMnBr3 NCs (3.7%). The PL enhancement is attributed to the synergistic effects between [MnBr6]4– units and [PbBr6]4– units. Furthermore, we verified the similar synergistic effects between [MnBr6]4– units and [SbBr6]4– units in Sb-doped CsMnBr3 NCs. Our results highlight the potential of tailoring luminescence properties of manganese halides through heterometallic doping.
研究领域:
材料科学
·
纳米技术
·
光电子学
·
无机化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）