Manipulating Ion Migration for Highly Stable Light-Emitting Diodes with Single-Crystalline Organometal Halide Perovskite Microplatelets

作者：Chen, Mingming; Shan, Xin; Geske, Thomas; Li, Junqiang; Yu, Zhibin^*

来源：ACS Nano, 2017, 11(6): 6312-6318.

DOI：10.1021/acsnano.7b02629

• halide perovskites
• microplatelets
• light-emitting diodes
• ion migration
• laser
• single crystal

Ion migration has been commonly observed as a detrimental phenomenon in organometal halide perovskite semiconductors, causing the measurement hysteresis in solar cells and ultrashort operation lifetimes in light-emitting diodes. In this work, ion migration is utilized for the formation of a p-i-n junction at ambient temperature in single-crystalline organometal halide perovskites. The junction is subsequently stabilized by quenching the ionic movement at a low temperature. Such a strategy of manipulating the ion migration has led to efficient single-crystalline light-emitting diodes that emit 2:3 eV photons starting at 1.8 V and sustain a continuous operation for 54 h at similar to 5000 cd m(-2) without degradation of brightness. In addition, a whispering-gallery-mode cavity and exciton-exciton interaction in the perovskite microplatelets have both been observed that can be potentially useful for achieving electrically driven laser diodes based on single-crystalline organometal halide perovskite semiconductors.

• 出版日期2017-6
• 单位江苏大学