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Indexed by:期刊论文

Date of Publication:2008-02-01

Journal:CHINESE PHYSICS LETTERS

Included Journals:SCIE、ISTIC

Volume:25

Issue:2

Page Number:715-718

ISSN No.:0256-307X

Abstract:We demonstrate near-infrared organic light-emitting devices with a periodically arranged tris(8-quinolinolato)aluminum (Alq(3)):copper phthalocyanine (CuPc)/4-(dicyanomethylene)-2-methyl-6-(4-dimethylaminost-yry)-4H-pyran (DCM) multilayer structure. DCM and Alq(3) doped with CuPc were periodically deposited. Room-temperature electrophosphorescence was observed at about 1.1 mu m due to transitions from the first excited triplet state to the singlet ground state (T-1 - S-0) of CuPc. In this device, we utilize the overlap between the Q band pi - pi* at about 625 nm of the absorption spectra of CuPc and the PL spectra of the DCM. The near-infrared emission intensity of the CuPc-doped Alq(3) device with DCM increases about 2.5 times larger than that of the device without DCM. We attribute the efficiency enhancement to the better overlap between the PL spectra of DCM and the absorption spectra of CuPc.