在现场化物空隙调整低维佩洛夫斯基特,实现多重可调节的发光性能
Chen Sun1,2, Chang-Qing Jing1,3, Dong-Yang Li1,2
1Research Institute of Optoelectronic Functional Materials, School of Chemistry, Chemical Engineering and Materials, Jining University, Qufu, Shandong, 273155, China.
Advanced science (Weinheim, Baden-Wurttemberg, Germany)
|March 17, 2025
概括
在二氨基烯胺化矿晶体中的缺陷工程调整了从蓝白色到绿色的发光. 减少化物空缺可以提高量子产量和寿命,从而改善光电子应用.
科学领域:
- 材料科学 材料科学 材料科学
- 固态化学 固态化学
- 光物理学的光学物理学
背景情况:
- 表面缺陷显著影响矿的光物理性质和光电子设备性能.
- 目前的缺陷被动化方法提高了发光效率,但缺乏通过缺陷化学进行全面的优化.
研究的目的:
- 在0D矿单晶中展示可调节发光的缺陷工程策略.
- 通过控制化物空隙度,实现同时修改多个发光性质.
主要方法:
- 在受控结晶环境下制造[DADPA]PbBr5单晶.
- 光谱检测 (光发光,时间分辨光发光).
- 了解缺陷属性关系的第一原则计算.
主要成果:
- 可调节的发光从宽带蓝白到狭窄的绿色辐射 (445-535nm) 通过减少空隙 (VBr).
- 量子产量显著增加,从3.7%增加到80.8%,寿命从5.4增加到57.7 ns.
- 减少的VBr缩小了带隙,抑制了非辐射性重组,并增强了结合激子发射.
结论:
- 通过VBr减小的缺陷工程提供了一种通用策略,用于对矿的多维发光控制.
- 这种方法提高了光发光的性能,并为先进的光电子应用开辟了道路.
- 该策略可扩展到其他矿系统,使其具有广泛适用性.
更多相关视频
08:12Low Pressure Vapor-assisted Solution Process for Tunable Band Gap Pinhole-free Methylammonium Lead Halide Perovskite Films
Published on: September 8, 2017
9.5K
04:14Facile Synthesis of Colloidal Lead Halide Perovskite Nanoplatelets via Ligand-Assisted Reprecipitation
Published on: October 1, 2019
12.8K
相关概念视频
01:14Photoluminescence: Applications
Photoluminescence offers a wide range of applications due to its inherent sensitivity and selectivity. This technique allows for both direct and indirect analyses of the analyte. Direct quantitative analysis is possible when the analyte exhibits a favorable quantum yield for fluorescence or phosphorescence. However, an indirect analysis may be feasible if the analyte is not fluorescent or phosphorescent, or if the quantum yield is unfavorable. Indirect methods include reacting the analyte with...
01:26Imperfections in Crystal Structure: Stoichiometric Point Defects
Schottky defects arise when some lattice points in a crystal, such as those in NaCl, remain unoccupied, creating lattice vacancies without disturbing the overall electrical neutrality of the crystal. This defect is common in ionic crystals where the positive and negative ions are similar in size, as seen in sodium chloride and cesium chloride. The presence of Schottky defects enables the crystal to conduct electricity to a small extent through an ionic mechanism. Electric fields cause nearby...