Siyuan Laboratory, Department of Physics, Jinan University , Guangzhou 510632, P.R. China.
School of Chemistry and Chemical Engineering, South China University of Technology , Guangzhou 510640, P.R. China.
ACS Appl Mater Interfaces. 2015 Dec 9;7(48):26405-13. doi: 10.1021/acsami.5b06068. Epub 2015 Nov 24.
We present an investigation of deep-blue fluorescent polymer light-emitting diodes (PLEDs) with a novel functional 1,3,5-triazine core material (HQTZ) sandwiched between poly(3,4-ethylene dioxythiophene):poly(styrene sulfonic acid) layer and poly(vinylcarbazole) layer as a hole injection layer (HIL) without interface intermixing. Ultraviolet photoemission spectroscopy and Kelvin probe measurements were carried out to determine the change of anode work function influenced by the HQTZ modifier. The thin HQTZ layer can efficiently maximize the charge injection from anode to blue emitter and simultaneously enhance the hole mobility of HILs. The deep-blue device performance is remarkably improved with the maximum luminous efficiency of 4.50 cd/A enhanced by 80% and the maximum quantum efficiency of 4.93%, which is 1.8-fold higher than that of the conventional device without HQTZ layer, including a lower turn-on voltage of 3.7 V and comparable Commission Internationale de L'Eclairage coordinates of (0.16, 0.09). It is the highest efficiency ever reported to date for solution-processed deep-blue PLEDs based on the device structure of ITO/HILs/poly(9,9-dialkoxyphenyl-2,7-silafluorene)/CsF/AL. The results indicate that HQTZ based on 1,3,5-triazine core can be a promising candidate of interfacial materials for deep-blue fluorescent PLEDs.
我们研究了一种深蓝色荧光聚合物发光二极管（PLED），其新颖的功能核心材料是 1,3,5-三嗪（HQTZ），夹在聚（3,4-亚乙基二氧噻吩）：聚（苯乙烯磺酸）层和聚（芴基乙烯）层之间，作为空穴注入层（HIL），没有界面混合。我们进行了紫外光电子能谱和 Kelvin 探针测量，以确定受 HQTZ 修饰剂影响的阳极功函数的变化。薄的 HQTZ 层可以有效地最大限度地增加来自阳极到蓝色发射器的电荷注入，同时提高 HIL 的空穴迁移率。深蓝色器件的性能得到了显著改善，最大亮度效率从 4.50 cd/A 提高了 80%，达到 4.93%，比没有 HQTZ 层的传统器件提高了 1.8 倍，包括更低的开启电压 3.7 V 和可比的国际照明委员会坐标（0.16，0.09）。这是迄今为止基于 ITO/HILs/聚（9,9-二烷氧基苯基-2,7-硅芴）/CsF/AL 器件结构报道的溶液处理深蓝色 PLED 的最高效率。结果表明，基于 1,3,5-三嗪核心的 HQTZ 可以成为深蓝色荧光 PLED 界面材料的有前途的候选材料。
