Yu Yang, Zhou Wei, Li Cheng, Han Peigeng, Li Hui, Zhao Kun
Institute of Ultrafast Optical Physics, MIIT Key Laboratory of Semiconductor Microstructure and Quantum Sensing & Department of Applied Physics, Nanjing University of Science and Technology, Nanjing 210094, China.
State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China.
Nanomaterials (Basel). 2023 Jan 29;13(3):549. doi: 10.3390/nano13030549.
Lead halide perovskites have achieved remarkable success in various photovoltaic and optoelectronic applications, especially solar cells and light-emitting diodes (LEDs). Despite the significant advances of lead halide perovskites, lead toxicity and insufficient stability limit their commercialization. Lead-free double perovskites (DPs) are potential materials to address these issues because of their non-toxicity and high stability. By doping DP nanocrystals (NCs) with lanthanide ions (Ln), it is possible to make them more stable and impart their optical properties. In this work, a variable temperature hot injection method is used to synthesize lead-free Tb-doped CsNaInCl DP NCs, which exhibit a major narrow green photoluminescence (PL) peak at 544 nm derived from the transition of TbD→F. With further Bi co-doping, the Tb-Bi-co-doped CsNaInCl DP NCs are not only directly excited at 280 nm but are also excited at 310 nm and 342 nm. The latter have a higher PL intensity because partial Tb ions are excited through more efficient energy transfer channels from the Bi to the Tb ions. The investigation of the underlying mechanism between the intrinsic emission of CsNaInCl NCs and the narrow green PL caused by lanthanide ion doping in this paper will facilitate the development of lead-free halide perovskite NCs.
卤化铅钙钛矿在各种光伏和光电子应用中取得了显著成功，尤其是在太阳能电池和发光二极管（LED）方面。尽管卤化铅钙钛矿取得了重大进展，但铅毒性和稳定性不足限制了它们的商业化。无铅双钙钛矿（DPs）因其无毒和高稳定性而成为解决这些问题的潜在材料。通过用镧系离子（Ln）掺杂DP纳米晶体（NCs），可以使其更稳定并赋予其光学性质。在这项工作中，采用变温热注射法合成了无铅铽掺杂的CsNaInCl DP NCs，其在544 nm处呈现出一个主要的窄绿色光致发光（PL）峰，源于TbD→F跃迁。通过进一步的铋共掺杂，铽-铋共掺杂的CsNaInCl DP NCs不仅在280 nm处被直接激发，还在310 nm和342 nm处被激发。后者具有更高的PL强度，因为部分铽离子通过从铋到铽离子的更高效能量转移通道被激发。本文对CsNaInCl NCs的本征发射与镧系离子掺杂引起的窄绿色PL之间潜在机制的研究将促进无铅卤化钙钛矿NCs的发展。
