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13 September 2012Transient thermal analysis of white organic light-emitting diode for heat-dissipation application
The thermal conductivity of the organic light-emitting material in a white organic light-emitting diode (WOLED) was
precisely estimated by solving two-dimensional transient heat transfer equation and fitting experimental data. A WOLED
usually operates in relatively high current mode to maintain higher brightness for lighting application. A practical
solution for heat dissipation is crucial for properly applying WOLED in lighting application. Thermal conductivity of a
material is a critical parameter for developing heat dissipation solution. A typical WOLED consists of several thin
organic light-emitting layers with similar thermal characteristics sandwiched by anode and cathode. These organic layers
can be regarded as a single organic light-emitting material for simplifying thermal analysis. The thermal characteristic of
the organic light-emitting material can be represented by an effective or equivalent thermal conductivity in analytical
model. The analytical model of temperature distribution was obtained from solving two-dimensional transient heat
transfer equation with simplified bi-layer structure. The effective thermal conductivity of the thin-film organic
light-emitting material can be precisely estimated by fitting analytical temperature distribution function to the
experimental data. Our preliminary investigation indicates that the thermal conductivity of the organic light-emitting
material is estimated between 0.28 and 0.29 w/m°C, similar to well-known organic compounds.
"Transient thermal analysis of white organic light-emitting diode for heat-dissipation application", Proc. SPIE 8476, Organic Light Emitting Materials and Devices XVI, 847624 (13 September 2012); https://doi.org/10.1117/12.929320
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Henglong Yang, "Transient thermal analysis of white organic light-emitting diode for heat-dissipation application," Proc. SPIE 8476, Organic Light Emitting Materials and Devices XVI, 847624 (13 September 2012); https://doi.org/10.1117/12.929320