School of Chemical Engineering, Sungkyunkwan University , Suwon 440-746, South Korea.
ACS Appl Mater Interfaces. 2013 Dec 11;5(23):12369-74. doi: 10.1021/am403173n. Epub 2013 Dec 2.
The performance of quantum dot light-emitting diodes (QD-LEDs) was investigated for different hole transport layers with small molecules and polymers: poly(4-butyl-phenyl-diphenyl-amine), poly-N-vinylcarbazole (PVK), N,N'-diphenyl-N,N'-bis(3-methylphenyl)-1,1'-diphenyl-4,4'-diamine, 4,4',4″-tris(N-carbazolyl)-triphenyl-amine (TCTA), and 4,4'-bis(carbazole-9-yl)biphenyl (CBP). The electroluminescence performance of QD-LEDs was considerably improved by adding small molecules (TCTA or CBP) having high hole mobilily to the polymer hole transport material (PVK). The maximal current efficiency of QD-LED-based PVK was improved by 27% upon addition of 20 wt % TCTA due to the hole injection improvement. The lower turn-on voltage, the higher current density, and the higher luminance were achieved by addition of TCTA. The maximal luminance of 40900 cd/m(2) and the highest current efficiency of 14.0 cd/A with the narrow full width at half-maximum (<35 nm) were achieved by the best hole transport layer.
研究了具有小分子和聚合物的不同空穴传输层的量子点发光二极管（QD-LED）的性能：聚（4-丁基-苯基-二苯基-胺）、聚-N-乙烯基咔唑（PVK）、N，N'-二苯基-N，N'-双（3-甲基苯基）-1,1'-二苯基-4,4'-二胺、4,4',4″-三（N-咔唑基）三苯基-胺（TCTA）和 4,4'-双（咔唑-9-基）联苯（CBP）。通过向聚合物空穴传输材料（PVK）中添加具有高空穴迁移率的小分子（TCTA 或 CBP），QD-LED 的电致发光性能得到了显著改善。由于空穴注入的改善，基于 PVK 的 QD-LED 的最大电流效率提高了 27%，当添加 20wt%TCTA 时。通过添加 TCTA，实现了较低的开启电压、较高的电流密度和较高的亮度。最佳空穴传输层实现了 40900 cd/m2 的最大亮度和 14.0 cd/A 的最高电流效率，半峰全宽较窄（<35nm）。
