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针对聚合物电致发光二极管(PLED)面光源的结构特点,建立了PLED面光源正负极双通道的散热模型。采用有限元分析软件对PLED面光源在光强为1000 cd/m2时的热特性进行模拟,获得其在自然对流和强制对流下的温度场分布图,从仿真结果知PLED器件的最高温度TH均处于PFO-BT发光层,分别为43.934℃和26.234℃。模拟PLED面光源由开始加载电压至光强为5000 cd/m2的全过程,获得PLED面光源最高温度TH与输入功率P之间线性关系。通过改变PLED面光源电极形状及开口率大小,分别模拟得出其对PLED面光源热特性的影响。仿真结果表明电极形状是PLED面光源最高温度TH重要影响因素之一,采用圆形电极更有利于PLED面光源散热,PLED面光源最高温度TH随着开口率增大而增大,但并非呈现简单线性关系。PLED面光源的热学研究结果为其优化设计提供了理论依据。
Aiming at the structural characteristics of PLED surface light source, a two-channel heat dissipation model of PLED surface light source is established. The finite element analysis software was used to simulate the thermal characteristics of PLED surface light source at a light intensity of 1000 cd / m2. The temperature field distribution under natural convection and forced convection was obtained. From the simulation results, the maximum temperature of PLED device, TH In the PFO-BT emitting layer, respectively 43.934 ℃ and 26.234 ℃. The simulated PLED surface light source is loaded with voltage from the beginning to the light intensity of 5000 cd / m2 of the whole process to obtain the linear relationship between the maximum temperature of the PLED surface light source TH and the input power P. By changing the shape and aperture ratio of the PLED surface light source, the influence of the PLED surface heat source on its thermal characteristics was simulated. The simulation results show that the shape of the electrode is one of the most important factors affecting the maximum temperature TH of the PLED surface light source. The circular electrode is more favorable for the heat dissipation of the PLED surface light source. The maximum temperature PL of the PLED surface light source increases with the increase of the aperture ratio, Linear relationship. The thermal study results of PLED surface light source provide the theoretical basis for its optimal design.