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间隔层对有机电致发光激基复合物的影响
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Abstract:
本论文通过构建不同结构的有机电致发光器件(OLED)，深入探究了间隔层对激基复合物效率的影响。间隔层的加入可以和发光层中的材料产生界面激基复合物，较低能级的激基复合物可以有效接收来自周围发光层中的长程能量传递，增加能量利用效率。其中单间隔层有机材料为DMAC-DPS的OLED器件获得了最大功率效率、电流效率和外量子效率，分别为47.47 lm/W、45.34 cd/A和15.60%。此外在发光层中插入多层间隔层进一步探究OLED效率影响，获得的最大功率效率电流效率和外量子效率分别为48.13 lm/W、47.14 cd/A和14.32%。为排除发光层中激基复合物之间短程能量互相传递影响，将发光层中掺杂的DMAC-DPS分离出来单独放置在发光层中。该系列的前两个器件由于厚度为7 nm，含有大量的DMAC-DPS分子。淬灭会导致器件效率的降低。最大功率效率和电流效率分别为39.39 lm/W和40.74 cd/A。二元掺杂器件通过在发光层中加间隔层以增加能量利用率，在性能上十分接近三元掺杂OLED器件，为简单OLED器件提供了思路。
In this paper, by constructing organic light-emitting devices (OLEDs) with different structures, the influence of spacer layer on the efficiency of exciplex is deeply explored. The addition of the spacer layer can produce interfacial exciplex with the materials in the luminescent layer. The exciplex with lower energy levels can effectively receive long-range energy transfer from the surrounding luminescent layer and increase energy utilization efficiency. The OLED device with single spacer organic material DMAC-DPS obtained the maximum power efficiency, current efficiency and external quantum efficiency of 47.47 lm/W, 45.34 cd/A and 15.60%, respectively. In addition, a multi-layer spacer layer is inserted into the light-emitting layer to explore the reasons for the increase and decrease of OLED efficiency. The maximum power efficiency current efficiency and external quantum efficiency are obtained as follows: 48.13 lm/W, 47.14 cd/A and 14.32%. In order to eliminate the influence of short-range energy transfer between exciplex in the luminescent layer, the doped DMAC-DPS in the luminescent layer is separated and placed in the luminescent layer alone. The first two devices in this series have a large number of DMAC-DPS molecules due to the thickness of 7 nm. Quenching leads to a decrease in device efficiency. The maximum power efficiency and current efficiency are 39.39 lm/W and 40.74 cd/A, respectively. The binary doped device is very close to the ternary doped OLED device in performance by adding a spacer layer in the light-emitting layer to increase the energy utilization rate, which provides an idea for simple OLED devices.
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