Characteristics of Electroluminescence Based on Zn Complexes

Abstract

Recently, organic light-emitting diodes (OLEDs) have widely been used as one of the information display techniques. We synthesized 2-(2-hydroxyphenyl)benzoxazole [Zn(HPB)2], (1,10-phenanthroline)(8-hydroxyquinoline) [Zn(phen)q] and (2-(2-hydroxyphenyl)benzoxazole)(8-hydoxyquinoline) [Zn(HPB)q]. The ionization potential (IP) and electron affinity (EA) of Zn complexes were investigated by cyclic voltammetry (CV). The EAs of Zn(HPB)2, Zn(HPB)q, and Zn(phen)q were determined to be 2.8, 3.5, and 3.2 eV, respectively. Moreover, the IPs of Zn(HPB)2, Zn(HPB)q, and Zn(phen)q are 6.5, 6.8, and 7.3 eV, respectively. The EL spectra of Zn(HPB)2, Zn(HPB)q, and Zn(phen)q were observed at the wavelengths of 455, 532, and 535 nm, respectively. We used Zn(HPB)2 and Zn(HPB)q as hole-blocking materials and Zn(phen)q as an electron-transporting material. The efficiency of the device with Zn(HPB)2 increased compared with that of the device without it. The device with Zn(phen)q exhibited an improved performance Alq3 as an electron-transporting material.

Electron Transport Properties of Zn(phen)q Compared with Alq3in OLED

“…We synthesized and characterized the electrical properties of Zn(phen)q, which was used as an electron transport layer in our previous report [11]. In this study, we investigated the difference between Zn(phen)q and Alq 3 as electron transporting materials; the results suggest that the electrical properties depend on the carrier injection.…”

High Efficiency Property of White OLED Doped on Blue Material and Red Material

“…In this study, we synthesized the red emission materials, (POB) 2 Ir(pic) and previous research was synthesized Zn(HPB) 2 as blue emitting materials [5]. The ionization potential (IP) and electron affinity (EA) of (POB) 2 Ir(pic) were measured by cyclic-voltammetry.…”

White Organic Light-Emitting Diode Using Blue-Light-Emitting Zn(HPB)2 Material

“…It can be used as s backlight source in liquid crystal displays or a white light source. [1][2][3] The use of white organic light-emitting diode (OLED) devices, in which discrete red, green, and blue (RGB) pixilation can be accomplished without using a tedious and troublesome precision shadow mask, has recently become increasingly popular as one of the major methods of fabricating full-color displays combined with RGB color filters, as the backlight sources of liquid crystal displays and as solid-state lighting systems. 4,5) To realize a full-color OLED, the fabrication of the device should be simple and should have a high efficiency.…”