Color stable white organic light-emitting diode based on a novel triazine derivative

✍ Scribed by Bo Qu; Zhijian Chen; Feng Xu; Huayu Cao; Zhihao Lan; Ziyao Wang; Qihuang Gong

• Publisher: Elsevier Science
• Year: 2007
• Tongue: English
• Weight: 204 KB
• Volume: 8
• Category: Article
• ISSN: 1566-1199
• DOI: 10.1016/j.orgel.2007.03.009

✦ Synopsis

A novel red-orange emitting material with a branched molecular structure, 2,4,6-tris[2-(N-ethyl-3-carbazole)carboxethenyl]-1,3,5-s-triazine (TC3), has been synthesized and characterized using UV-visible, photoluminescence (PL) and electroluminescence (EL) spectroscopy. White EL devices were fabricated using TC3 as a red-orange emitter and 8-hydroxyquinolinolato lithium (Liq) as a blue-green emitter. N,N-bis(3-methylphenyl)-N,N-diphenylbenzidine (TPD) as the adjustor for charge carrier mobility was introduced between the two emitting layers to improve the stability of the white emission color on bias voltage. The EL devices of ITO/poly(N-vinylcarbazole) (PVK):TC3 (56 nm)/TPD (5 nm)/Liq (30 nm)/Mg:Ag exhibited good quality white emission. The Commission Internationale De L'Eclairage chromaticity coordinates are (0.34, 0.39) and are stable on the bias voltage.