不同荧光蓝光层厚度的OLED的制备与光电性能

Impacts of Thickness Variation of Blue Emitting Layer on Fabrication and Photoelectric Properties of OLEDs

摘要:

采用蓝色荧光材料1p-TDPVBi结合绿色磷光材料2Ir(ppy)3掺杂到母体材料CBP作为绿光发光层，并且采用3BPhen作为电子传输层和激子阻挡层制备结构为ITO/m-MTDATA(50nm)/ NPB(10nm)/p-TDPVBi(dnm)/CBP∶Ir(ppy)38% 7nm/BPhen(60nm)/LiF(1nm)/Al的有机发光器件。实验结果表明：通过改变蓝光发光层p TDPVBi的厚度，得到了高效率的有机发光器件，当p-TDPVBi厚度为5nm时，器件的电流效率和功率效率在4V时达到32.3cd/A和25.3lm/W，亮度在11V时达到31020cd/m2。研究了p-TDPVBi厚度由3nm变化到9nm，OLED器件的电流密度 电压特性曲线、亮度-电压曲线及电流效率 电压和功率效率-电压等光电性能的变化。

Abstract:

Organic light emitting diodes (OLED) with the multilayer structure of ITO/m MTDATA(50nm)/NPB(10nm)/p-TDPVBi(dnm)/CBP∶Ir(ppy)38% 7nm/BPhen(60nm)/LiF(1nm)/Al were fabricated. For the process, blue fluorescent material p-TDPVBi and green phosphorescent dye Ir(ppy)3 were doped into CBP host to act as green emitter layer, and BPhen were applied to act as electron transport layer and exciton blocking layer. Experimental results indicate, when the thickness of p-TDPVBi layer is 5nm, its maximum power efficiency and maximum current efficiency reach 32.3cd/A and 25.3lm/W at 4V, respectively, and the maximum luminance is 31020cd/m2 at 11V. Moreover, in the thickness variation range of 3～9nm of p-TDPVBi, the photoelectric properties, including current density to voltage, luminance to voltage, current efficiency to voltage, power efficiency to voltage, were discussed.