利用电子传输性能良好的苯并噻唑螯合锌(Zn(BTZ)2)作为蓝光层,通过设计不同类型的空穴传输层并试验不同厚度的发光层后,制作了一种最佳厚度的双发光层白色电致发光器件:氧化铟锡(ITO)/N-N′-双(3-甲基苯基)-N-N′-二苯基-1-1′-二苯基-4-4′-二胺(TPD)∶N,N′-二(1-萘基)-N,N′-二苯基-1,1′-联苯-4-4′-二胺(NPB)(1∶0.05)(30nm)/NPB(10nm)/2-(2-羟基苯基)Zn(BTZ)2(30nm)/双(2-甲基-8-羟基喹啉)(4-联苯氧基)铝(BAlq)∶5,6,11,12-四苯基-四苯并(rubrene)(30nm)/8-羟基喹啉铝(Alq)(15nm)/Mg∶Ag.经有效的控制电子和空穴的注入,实现了载流子在发光层间的均匀分布,驱动电压从8V变为13V时,获得了色坐标在(0.32,0.40)和(0.30,0.38)之间变化的白光.器件的最大外量子效率为0.85%,当工作电压为15V时,器件最高亮度为11240cd/m^2.器件性能得以提高的原因是选择了合适的空穴传输层和最佳的发光层厚度,从而达到了空穴和电子的注入平衡.
By using Zn(BTZ)2, an efficient material to transport electrons, as blue emitting layer, a white organic light-emitting deviee with the strueture of indium tin oxide (ITO) / N, N′- diphenyl- N, N′- bis ( 3- methylphenyl) - 1,1 - biphenyl-4,4′- diamine) (TPD) : N, N′-bis-( 1-naphenyl)-N, N′-biphenyl -1, 1′-biphenyl-4-4′-diamine (NPB)( 1:5% )(30 nm) /NPB( 10nm)/ bis[2- (2-hydroxyphenyl) benzothiazolate] zinc ( Zn(BTZ)2 ) ( 30 nm)/ bis(2-methyl-8-quinolinolato) (para-phenylphenolato) aluminum (BAlq) : 5,6, 11,12-tetmphenyl-naphthaeene (rubrene) (30 nm)/tris(8-hydroxyquinoline) (Alq) ( 15nm)/Mg : Ag has been sueeessively made after trying several kinds of hole transporting layers and different thieknesses of emitting layers. The device can efficiently control the injecting and distributes of carriers (electrons and holes). When the voltages changes from 8 to 13 V, the Commission Internationale de 1′Eclairage eoordinates ehange from (0.32,0.40) to (0.30,0.38) within the white-light region. The maximum external efficiency of this deviee is 0.85%, and when the driving voltage is 15 V, it shows the maximum brightness of 11240 cd/m^2 . By ehosing proper hole transporting layers and the best thicknesses of emitting layers, the device achieves a balance between the hole and electron injection, which is presumed to be responsible for the improved performances of the device.