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以ADN为基质,分别以不同掺杂剂制备了四种蓝色有机发光器件,器件结构为:CuPc(12 nm)/NPB(40 nm)/AND∶Dopant(50 nm)/Alq(12 nm)/LiF(4 nm)/Al。掺杂剂有:BCzVB(amino-substituted distyrylarylenederivatives)、TBPe、BCzVBi和DSA-ph四种。研究了最佳掺杂浓度以及器件的亮度、电流密度、效率和色坐标等电学特性和光学特性。其中掺杂BCzVB制备了色纯度高、低电流猝灭性的蓝色有机发光器件,色坐标达到x=0.146,y=0.162,最大亮度为11600 cd/m2(15 V),电流效率为2.8 cd/A,流明效率为1.79 lm/W;以ADN为基质,分别以TBPe、BCzVBi和DSA-ph为掺杂剂,制备了另外三种对比器件。器件ADN∶TBPe色坐标为x=0.162,y=0.222(蓝绿光),效率随电流的增加而降低很快;器件ADN∶BczVBi有较好的色纯度(色坐标:x=0.164,y=0.146),但电流效率较低:2.03 cd/A,效率随电流的增加降低幅度也较快。器件ADN∶DSA-ph效率较高为8 cd/A,效率随电流增加变化幅度不大,但色纯度比较差(x=0.153,y=0.306),适合于做白色有机发光器件。
Four kinds of blue organic light-emitting devices with different dopants were prepared using ADN as the substrate. The device structure was CuPc (12 nm) / NPB (40 nm) / AND: Dopant (50 nm) / Alq / LiF (4 nm) / Al. Dopants are: BCzVB (amino-substituted distyrylarylenederivatives), TBPe, BCzVBi and DSA-ph four. The optimal doping concentration and the electrical and optical characteristics of the device such as brightness, current density, efficiency and color coordinates were studied. The blue organic light-emitting devices with high color purity and low current quenching were prepared by doping BCzVB with color coordinates of x = 0.146, y = 0.162, maximum brightness of 11,600 cd / m2 (15 V) and current efficiency of 2.8 cd / A, lumens efficiency of 1.79 lm / W; to ADN as the substrate, respectively, with TBPe, BCzVBi and DSA-ph as dopants, prepared three other comparative devices. The device ADN: TbPe color coordinates x = 0.162, y = 0.222 (blue-green light), efficiency decreases rapidly with increasing current; device ADN: BczVBi have better color purity (color coordinates: x = 0.164, y = 0.146), but the current efficiency is low: 2.03 cd / A, efficiency decreases rapidly with the increase of current. The efficiency of ADN: DSA-ph is 8 cd / A. The efficiency changes little with the increase of current, but the color purity is poor (x = 0.153, y = 0.306), which is suitable for white organic light-emitting device.