Electroluminescence from double heterostructures of perovskite semiconductors and thiophene/phenylene co-oligomers

Abstract

We report LED properties in perovskite semiconductor and thiophene/phenylene co-oligomer (TPCO) double heterostructures. Perovskite semiconductors were formed by using a simple solution process, the “cast-capping method”, on substrates with TPCOs. The electroluminescence was quenched rapidly, but it recovered to nearly its initial states. Under pulsed operation within 3 V, the device had rather long durability. We compared the LED properties with those of TPCO LEDs. Ion migrations and/or light-emitting electrochemical cell operations were strongly suggested in the perovskite/TPCO LEDs.