Su Binbin, Molokeev Maxim S, Xia Zhiguo
The State Key Laboratory of Luminescent Materials and Devices, Guangdong Provincial Key Laboratory of Fiber Laser Materials and Applied Techniques, School of Materials Science and Technology, South China University of Technology, Guangzhou 510640, P. R. China.
Laboratory of Crystal Physics, Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk 660036, Russia.
J Phys Chem Lett. 2020 Apr 2;11(7):2510-2517. doi: 10.1021/acs.jpclett.0c00593. Epub 2020 Mar 16.
Doping is able to create novel optoelectronic properties of halide perovskites, and the involved mechanism of efficient emission is still a challenge. Herein Mn substitution into 2D layered perovskites (CHN)PbBr was investigated, demonstrating broad-band orange-red emission originating from the T → A transition of Mn dopant. The photoluminescence quantum yield (PLQY) of Mn emission is up to 60.8% related to the energy transfer in coupled states. We verify that an actual Mn dopant as low as 0.476% reaches a high PLQY, whereas the nominal adding amount is 0.8 as the Mn/Pb ratio. The small activation energy (∼6.72 meV) between the Mn d state and the trap state accounts for this highly efficient energy transfer and photoluminescence. The proposed luminescence mechanism in Mn-doped 2D halide perovskites would provide unique insights into the doping design toward high-performance luminescence materials.
掺杂能够赋予卤化物钙钛矿新的光电特性，而其高效发光的相关机制仍是一个挑战。在此，研究了将锰掺入二维层状钙钛矿（CHN）PbBr中，结果表明宽带橙红色发射源自锰掺杂剂的T→A跃迁。与耦合态中的能量转移相关，锰发射的光致发光量子产率（PLQY）高达60.8%。我们证实，实际锰掺杂剂低至0.476%时就能实现高PLQY，而锰/铅比的标称添加量为0.8。锰d态与陷阱态之间较小的活化能（约6.72 meV）解释了这种高效的能量转移和光致发光现象。所提出的锰掺杂二维卤化物钙钛矿发光机制将为高性能发光材料的掺杂设计提供独特见解。
