微腔效应影响有机发光器件调制带宽特性研究OA北大核心CSTPCD

Visible light communication(VLC)technology ingeniously integrates communication and illumination or display,providing an efficient and convenient solution for communication.Organic light-emitting diodes(OLEDs),serving as an artificial light source closest to natural sunlight,exhibit tremendous application potential at the transmitter end of VLC systems.However,constrained by the slow radiative recombination rate of organic lumi-nescent dyes,OLEDs always demonstrate a sluggish response speed under high-frequency signal excitation.To over-come this limitation,we propose the utilization of a microcavity structure with the aim of enhancing the spontaneous emission rate of organic emitters through the microcavity effect,thereby improving the device,s frequency response.Research results indicate that the Purcell effect induced by an optical microcavity with a specific cavity length can el-evate the photon density at the emitter position,accelerating its spontaneous emission rate.This enhancement success-fully increases the modulation bandwidth from 4 kHz to 7 kHz,expanding the response frequency range by nearly 75%.