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发光层和空穴传输层对白色电致发光器件性能的影响
  • 期刊名称:物理学报 第56卷 第12期7213-7217(2007) (SCI收录杂志,IF:1.4)
  • 时间:0
  • 分类:TN383.1[电子电信—物理电子学]
  • 作者机构:[1]天津理工大学材料物理研究所,天津市光电显示材料与器件重点实验室,天津300384
  • 相关基金:国家自然科学基金(批准号:60576038); 天津市自然科学基金重点项目(批准号:06TXTJJC14603); 国家自然科学基金国际合作项目; 天津市高等学校重点学科建设计划资助的课题.
  • 相关项目:实现有机电致发光固态照明光源的某些关键问题研究
中文摘要:

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.

英文摘要:

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.

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