A fluorene derivative of 2,3-bis(9,9-dihexyl-9H-fluoren-2-yl)quinoxaline (BFLYQ) with blue fluorescence peaking at 425 nm is synthesized. The blend film of BFLYQ and N,N'-di(naphthalen-2-yl)-N,N'-diphenyl-benzine (NPB) exhibited an additional bathochromic shifted and broadbanded emission at 513 nm besides blue light in photoluminescence (PL) spectrum. The bilayer device with a structure of indium-tin-oxide (ITO)/NPB (40 nm)/BFLYQ (40 nm)/Mg : Ag showed a low-energy emission peaking at green area in electroluminescent (EL) spectra, which is due to exciplex emission between NPB and BFLYQ molecules, and the blue emission from BFLYQ increased with the enhancement of bias voltage. Based on exciplex emission, using 4-(dicyanomethylene)-2-t-butyl-6-(1,1,7,7-tetramethyljulolidyl-9-enyl)-4H-pyran (DCJTB) as red dye, the color-tunable organic light-emitting diodes (OLEDs) are fabricated by conventional thermal vacuum deposition. The devices showed emission from red to white light with increasing the distance of DCJTB and the interface of NPB/BFLYQ. Also, the luminescent mechanism of DCJTB is discussed.

Date Published: 21 May 2009
PDF: 7 pages
Proc. SPIE 7282, 4th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Advanced Optical Manufacturing Technologies, 728234 (21 May 2009); doi: 10.1117/12.831017

Published in SPIE Proceedings Vol. 7282:
4th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Advanced Optical Manufacturing Technologies
Li Yang; John M. Schoen; Yoshiharu Namba; Shengyi Li, Editor(s)