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合成出近白色电致发光材料--2-(2-羟基苯基)苯并噻唑螯合锌(zn(BTZ)2),以该配合物作为具有电子传输性能的发光层主体,并在其中掺入不同含量的橙红色荧光染料Rubrene,制备出具有单一发光层白色OLED器件ITO/PVK:TPD/Zn(BTZ)2:Rubrene/Al.由其电致发光(EL)光谱图及相应色坐标值, 确定了Rubrene在Zn(BTZ)2中的最佳掺杂浓度比为0.05%.按此掺杂比制备的器件,色度随外加驱动电压在很大范围内(10-22.5 V)变化很小,其色坐标均非常接近于白色等能点.当电流密度为0.1 A/cm2, 驱动电压约为20 V,器件外量子效率最高值为0.63%,相应发光效率为4.05 cd/A,此时器件的色坐标为(x=0341,y=0.334),亮度为4048 cd/m2,器件综合性能达最优.文中还对上述掺杂型白光器件的发光和电学性能及发光机理进行了深入的研究和探讨.
A near-white electroluminescent material, 2- (2-hydroxyphenyl) benzothiazole chelate zinc (zn (BTZ) 2) was synthesized and used as the host of the luminescent layer with electron transport property Doped with different content of orange red fluorescent dye Rubrene to prepare a white OLED device with a single light-emitting layer ITO / PVK: TPD / Zn (BTZ) 2: Rubrene / Al. Its electroluminescence spectrum and its corresponding color coordinate Value, the optimal doping concentration ratio of Rubrene in Zn (BTZ) 2 was determined to be 0.05% .According to the doping ratio prepared device, the chromaticity changes with a wide range of driving voltage (10-22.5 V) The color coordinates are very close to the white equivalent point.When the current density is 0.1 A / cm2, the driving voltage is about 20 V, the maximum external quantum efficiency of the device is 0.63%, the corresponding luminous efficiency is 4.05 cd / A, The color coordinate of the device at this moment is (x = 0341, y = 0.334), the luminance is 4048 cd / m2, and the overall performance of the device reaches the optimum.The luminescent and electrical properties and the luminescence mechanism of the above- In-depth research and discussion.