Transient thermal analysis of white organic light-emitting diode for heat-dissipation application

摘要

The thermal conductivity of the organic light-emitting material in a white organic light-emitting diode (WOLED) wasprecisely estimated by solving two-dimensional transient heat transfer equation and fitting experimental data. A WOLEDusually operates in relatively high current mode to maintain higher brightness for lighting application. A practicalsolution for heat dissipation is crucial for properly applying WOLED in lighting application. Thermal conductivity of amaterial is a critical parameter for developing heat dissipation solution. A typical WOLED consists of several thinorganic light-emitting layers with similar thermal characteristics sandwiched by anode and cathode. These organic layerscan be regarded as a single organic light-emitting material for simplifying thermal analysis. The thermal characteristic ofthe organic light-emitting material can be represented by an effective or equivalent thermal conductivity in analyticalmodel. The analytical model of temperature distribution was obtained from solving two-dimensional transient heattransfer equation with simplified bi-layer structure. The effective thermal conductivity of the thin-film organiclight-emitting material can be precisely estimated by fitting analytical temperature distribution function to theexperimental data. Our preliminary investigation indicates that the thermal conductivity of the organic light-emittingmaterial is estimated between 0.28 and 0.29 w/m°C, similar to well-known organic compounds.© (2012) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.