Red electroluminescent devices based on rubrene derivative in 4,4′- N, N′-dicarubreneazole-biphenyl host and its application in white light emitting device for lighting purpose

• Published in: Solid-state electronics Vol. 53; no. 2; pp. 120 - 123
• Main Authors: Li, Tianle, Li, Wenlian, Li, Xiao, Han, Liangliang, Chu, Bei, Li, Mingtao, Hu, Zhizhi, Zhang, Zhiqiang
• Format: Journal Article
• Language: English
• Published: Kidlington Elsevier Ltd 01.02.2009; Elsevier
• Subjects: Applied sciences; Current efficiency; Derivatives; Devices; Electroluminescence; Electronics; Exact sciences and technology; Fundamental areas of phenomenology (including applications); Illumination; Lighting; Luminance; Optical sources and standards; Optics; Optoelectronic devices; Physics; Red-emitting; Rubrene derivative; Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices; White light; WOLED; Red-emitting; WOLED; Lighting; Rubrene derivative; Performance evaluation; White light; Lighting fitting; Transmitter; Red light; Aluminium; Aluminium complex; Luminance; Light emitting device; Electroluminescent device; Solid state device; Organic light emitting diodes; Optoelectronic device; Chromaticity; Color rendering; Organic electronics
• ISSN: 0038-1101; 1879-2405
• DOI: 10.1016/j.sse.2008.11.008

A rubrene (Ru) derivative, 2-formyl-5,6,11,12-tetraphenylnaphthacene (2FRu) was synthesized and was used as red dopant in N, N′-bis-(1-naphthyl)- N, N′-diphenyl-1,1′-biphenyl-4,4′-diamine (NPB) host in organic light-emitting device (OLED) that offers an emission peak at ∼598 nm and a current efficiency of 2.12 cd/A. The red emitter was also used to fabricate a white OLED (WOLED), in which 2FRu, tris-(8-hydroxyquinoline) aluminum (Alq 3) and NPB contribute to the red, green and blue emissive components, respectively. As a result, a high color rendering index of 89.8, CIE coordinates of (0.33, 0.33) at 11 V as well as a maximum luminance of 5000 cd/m 2 and a luminance efficiency of 4.72 cd/A were obtained. The performances suggest its potential applications for solid-state lighting. Also, the design and electroluminescent processes of the WOLED based on 2FRu were also discussed.