Peripheral modification of 1,3,5-triazine based electron-transporting host materials for sky blue, green, yellow, red, and white electrophosphorescent devices
作者:Hsiao-Fan Chen、Ting-Chih Wang、Shih-Wei Lin、Wen-Yi Hung、Hung-Chi Dai、Hao-Chih Chiu、Ken-Tsung Wong、Meng-Huan Ho、Ting-Yi Cho、Chieh-Wei Chen、Chung-Chun Lee
DOI:10.1039/c2jm31904g
日期:——
A systematic comparison of the physical properties and the dual-role (host and electron transport) applications of star-shaped 1,3,5-triazine-based ET-type hosts (T2T, 3N-T2T, 3P-T2T, and oCF3-T2T) with differential peripheral groups was reported. The introduction of N-heterocyclic polar peripheries onto a 1,3,5-triazine core gave evident benefits to the electron injection/transport properties, rendering efficient PhOLEDs with a simpler device configuration feasible. Among these hosts, 3P-T2T can serve both as a promising host and electron-transport material for various Ir-based electrophosphorescence devices. These PhOLEDs configured with the same device structure exhibited low operation voltages with a maximum ηext of 8%, 15.7%, 16.9%, 16.4% and 10.8% for sky blue (FIrpic), green [(PPy)2Ir(acac)], yellow [(Bt)2Ir(acac)], red [(Mpq)2Ir(acac)] and white [FIrpic + 0.5 wt%(Mpq)2Ir(acac)], respectively.
报告对具有不同外围基团的星形 1,3,5-三嗪基 ET 型宿主(T2T、3N-T2T、3P-T2T 和 oCF3-T2T)的物理性质和双重作用(宿主和电子传输)应用进行了系统比较。在 1,3,5-三嗪核心上引入 N-杂环极性外围基团对电子注入/传输特性有明显的好处,从而使具有更简单器件配置的高效 PhOLED 成为可能。在这些宿主中,3P-T2T 既是一种有前途的宿主材料,也是各种基于 Ir 的电致磷光器件的电子传输材料。这些具有相同器件结构的 PhOLED 显示出较低的工作电压,天蓝色(FIrpic)、绿色[(PPy)2Ir(acac)]、黄色[(Bt)2Ir(acac)]、红色[(Mpq)2Ir(acac)]和白色[FIrpic + 0.5 wt%(Mpq)2Ir(acac)]的最大 ηext 分别为 8%、15.7%、16.9%、16.4% 和 10.8%。