Zhuang Bin, Liu Yue, Yuan Shuo, Huang Hai, Chen Jiangkun, Chen Daqin
College of Physics and Energy, Fujian Normal University, Fuzhou, 350117, China.
Nanoscale. 2019 Aug 15;11(32):15010-15016. doi: 10.1039/c9nr05831a.
Mn-Doped CsPb(Cl/Br)3 quantum dots possess multi-functional optical, electronic and magnetic characteristics. However, they usually suffer from decomposition in air, and Mn2+ dopants will be gradually expelled from the perovskite host due to a radius mismatch between Pb2+ and Mn2+. To solve these crucial issues, the synthesis of glass stabilized Mn-doped quantum dots via an appropriate glass composition design and in situ glass crystallization is reported. Mn2+ dopants act as nucleating agents to promote the nucleation/growth of CsPb(Cl/Br)3 from B-P-Zn-Cs-Pb based oxyhalide glass and partition into the perovskite host to produce dual-color luminescence via efficient exciton-to-dopant energy transfer. Benefitting from the effective protection of robust glass, Mn-doped CsPb(Cl/Br)3 quantum dots exhibit superior water resistance and thermal stability. Particularly, almost 100% luminescence is retained after immersing the composite in water for 30 days. Interestingly, rapid thermal quenching for exciton recombination relative to Mn2+ d-d transition at cryogenic temperatures enables its promising applications as a ratiometric temperature sensing medium.
锰掺杂的 CsPb(Cl/Br)3 量子点具有多功能光学、电子和磁性特性。然而，它们通常在空气中会发生分解，并且由于 Pb2+ 和 Mn2+ 之间的半径不匹配，Mn2+ 掺杂剂会逐渐从钙钛矿主体中被逐出。为了解决这些关键问题，本文报道了通过适当的玻璃成分设计和原位玻璃结晶来合成玻璃稳定的锰掺杂量子点。Mn2+ 掺杂剂作为成核剂，促进 CsPb(Cl/Br)3 从 B-P-Zn-Cs-Pb 基卤氧化物玻璃中形核/生长，并分配到钙钛矿主体中，通过高效的激子到掺杂剂的能量转移产生双色发光。受益于坚固玻璃的有效保护，锰掺杂的 CsPb(Cl/Br)3 量子点表现出优异的耐水性和热稳定性。特别是，将复合材料在水中浸泡 30 天后，几乎保留了 100% 的发光。有趣的是，在低温下相对于 Mn2+ 的 d-d 跃迁，激子复合的快速热猝灭使其有望作为一种比率温度传感介质应用。
