基于量子阱结构的混合型白光有机发光器件

Hybrid White Organic Light-emitting Devices Based on Quantum Well Structure

以荧光材料BePP2结合量子阱作为蓝光发射层,磷光材料GIrl和R-4B掺入到混合双极性主体材料CBP∶Bphen中分别作为绿、红发光层并且在红绿发光层中引入间隔层TPBI,组合得到发白光的混合型有机发光器件。其中量子阱是以BePP2作为势阱、TCTA为势垒。结果表明:当势垒层数为2时,器件的最大发光亮度和电流效率分别为21 682.5 cd/m2和23.73 cd/A;当电压从7 V增加到14 V时,色坐标从(0.345,0.350)变化到(0.340,0.342)。与无量子阱结构的参考器件相比,势垒层数为2的器件的最大功率效率为8.07 lm/W,色坐标变化相对最小为±(0.005,0.008),还有一个高的显色指数83。

Hybrid white organic light-emitting device based on fluorescent layer combining with phosphorescent doping layer was fabricated, in which fluorescent material BePP2 acted as blue emit-ter layer, phosphorescent material GIrl and R-4B doped into CBP∶Bphen bipolar type host acted as green and red emitter layer, respectively. The ultrathin spacer layer was constructed by inserting a 2. 0 nm thin layer of TPBI between red and green emitting layer. In the quantum well structure, BePP2 and TCTA acted as the potential well layer and the potential barrier layer, respectively. The maximum luminance and current efficiency are 21 682. 5 cd/m2 and 23. 73 cd/A, respectively. The Commission Internationale de I ' Eclairage ( CIE ) coordinates of the device vary from ( 0 . 345 , 0. 350) at 7 V to (0. 340,0. 342) at 14 V when the number of potential barrier layer is two. In comparison with the reference device without quantum well structure,the device with two barrier lay-ers achieves a maximum power efficiency of 8. 07 lm/W, a low CIE coordinates changing of ± (0. 005, 0 . 008 ) , and a high color rendering index of 83 .