A stable red emission in polymer light-emitting diodes based on phenothiazine derivative

Huayu Cao; Zhijian Chen; Yingliang Liu; Jianghui Li; Shaokui Cao; Lixin Xiao; Shengang Xu; Qihuang Gong

doi:10.1117/12.757041

20 November 2007 A stable red emission in polymer light-emitting diodes based on phenothiazine derivative

Huayu Cao, Zhijian Chen, Yingliang Liu, Jianghui Li, Shaokui Cao, Lixin Xiao, Shengang Xu, Qihuang Gong

Proceedings Volume 6828, Light-Emitting Diode Materials and Devices II; 682809 (2007) https://doi.org/10.1117/12.757041
Event: Photonics Asia 2007, 2007, Beijing, China

Abstract

A novel soluble phenothiazine-based derivative, poly(3, 7-divinylene-N-octyl-phenothiazine 2, 3-diethylquinoxaline-5,8- diyl) (PQDN), is synthesized for application in red light-emitting diodes. PQDN was characterized by the measurements of cyclic voltammetry (CV), absorption and photoluminescence (PL) spectra. The band gap (Eg) was determined to be 1.89 eV. The smaller band gap suggested that the polymer is a good candidate for red electroluminescent materials. Polymer light-emitting diodes (PLEDs) with double-layer configuration of indium tin oxide (ITO) / (polyethylenedioxythiophene): poly(styrene sulfonate) (PEDOT:PSS) / PQDN: poly(N-vinylcarbazole) (PVK) (100:0, 80:20, 60:40, and 20:80 wt.%) / Mg:Ag were fabricated. The electroluminescent (EL) property was studied in details. In order to improve the EL performance further, the devices were thermally annealed at 100oC for one hour under the protection of nitrogen. Luminance is increased obviously. EL peak wavelength and the Commision International de L'Eclairage (CIE) coordinates are unaltered and located in red region with the increase of the operating voltages,.

Citation Download Citation

Huayu Cao, Zhijian Chen, Yingliang Liu, Jianghui Li, Shaokui Cao, Lixin Xiao, Shengang Xu, and Qihuang Gong "A stable red emission in polymer light-emitting diodes based on phenothiazine derivative", Proc. SPIE 6828, Light-Emitting Diode Materials and Devices II, 682809 (20 November 2007); https://doi.org/10.1117/12.757041

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