Dintakurti Sai S H, Vashishtha Parth, Giovanni David, Fang Yanan, Foo Norton, Shen Zexiang, Guet Claude, Sum Tze Chien, White Tim
ERI@N, Interdisciplinary Graduate School, Nanyang Technological University Singapore 639798
School of Materials Science and Engineering, Nanyang Technological University Singapore 639798
RSC Adv. 2021 Jul 8;11(39):24137-24143. doi: 10.1039/d1ra03965b. eCollection 2021 Jul 6.
Hybrid organic-inorganic lead halide perovskite nanoparticles are promising candidates for optoelectronic applications. This investigation describes the structural and optical properties of MA Cs PbBr mixed cation colloidal nanoparticles spanning the complete compositional range of Cs substitution. A monotonic progression in the cubic lattice parameter () with changes in the Cs content confirmed the formation of mixed cation materials. More importantly, time-resolved photoluminescence (TRPL) revealed the optimized 13 mol% Cs nanoparticle composition exhibits the longest charge carrier lifetime and enhancement in radiative pathways. This sample also showed the highest photoluminescence quantum yield (PLQY) of ∼88% and displays ∼100% improvement in the PLQY of pure MAPbBr and CsPbBr. Prototype LEDs fabricated from MACsPbBr were demonstrated.
有机-无机杂化卤化铅钙钛矿纳米颗粒是光电子应用的有前途的候选材料。本研究描述了跨越铯取代完整组成范围的MA Cs PbBr混合阳离子胶体纳米颗粒的结构和光学性质。随着铯含量的变化，立方晶格参数（）呈单调变化，证实了混合阳离子材料的形成。更重要的是，时间分辨光致发光（TRPL）表明，优化后的13 mol%铯纳米颗粒组成表现出最长的电荷载流子寿命，并增强了辐射途径。该样品还显示出约88%的最高光致发光量子产率（PLQY），并且在纯MAPbBr和CsPbBr的PLQY方面提高了约100%。展示了由MACsPbBr制成的原型发光二极管。
