白色发光混合胺矿的结构多样性
Lingling Mao1, Peijun Guo2, Mikaël Kepenekian3
1Department of Chemistry , Northwestern University , 2145 Sheridan Road , Evanston , Illinois 60208 , United States.
Journal of the American Chemical Society
|September 14, 2018
概括
研究人员合成了具有多样性结构的新混合胺矿,显示可调节的宽带发射. 1D结构 (2,6dmpz) 3Pb2Br10由于有效的电荷载体放松,实现了12%的光发光量子产量.
科学领域:
- 材料科学
- 固态化学
- 光电子产品
背景情况:
- 混合有机-无机化矿对光电子具有前景.
- 化和化呈现自捕捉激子 (STEs) 的白光发射.
研究的目的:
- 合成和描述具有多样性结构的新混合化.
- 研究结构多样性,电子特性和发光之间的关系.
- 探索这些材料在光电子应用中的潜力.
主要方法:
- 单晶X射线衍射
- 低频拉曼光谱
- 密度函数理论 (DFT) 的计算
- 光辐射光谱学
- 温度依赖的光发光 (PL) 测量
主要成果:
- 合成了结构多样化的混合胺 (1D,2D,3D) 带可调节的间隙 (2.923.50 eV).
- 观察到PbBr6八面体连接性和带隙能量之间的相关性:角共享 < 边共享 < 面共享.
- DFT计算显示电子结构依赖于八面体的连接性.
- 在化合物中确定恒定价值带能量和变化的导电带能量.
- 1D化合物表现出自由激子和STE辐射,其中 (2,6dmpz) 3Pb2Br10显示出最高的光发光量子产量 (12%).
结论:
- 混合胺矿的结构多样性显著影响其光电子特性.
- (2,6dmpz) 3Pb2Br10的1D结构促进了有效的电荷载体放松和高光发光量子产量.
- 这些发现为设计先进光电子设备的新矿材料提供了途径.
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