EFFICIENT SOLUTION-PROCESSED NEAR-INFRARED LIGHT-EMITTING DIODES

Abstract

Currently, it is challenging to develop highly efficient near-infrared light-emitting diodes (NIR LEDs), especially through the solution-processed approach. Traditional Ⅲ-Ⅴ semiconductors are epitaxially grown on crystalline substrates under high temperature in delicate clean rooms, which increase their cost and limit their integration with other materials. Solution-processed NIR LEDs based on organic semiconductors, metal halide perovskites and colloidal quantum dots (CQD) emerged as new technology have shown promise, but efficiency is still far from their visible counterparts. Moreover, the scalability from small area to large area is another issue that needs to be addressed in the future application. In this thesis, we aim to fabricate highly efficient NIR LEDs by solution-processed approaches (spin-coating) and explore their potential applications. We start form metal halide perovskites, followed by CQD and investigate how the quality of NIR emitters and device engineering play a role in performance of LEDs. The related characterizations are used to demonstrate proposed mechanism.