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Jpn. J. Appl. Phys. 47 (2008) pp. 2171-2173  |Previous Article| |Next Article|  |Table of Contents|
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Temperature Measurements of Organic Light-Emitting Diodes by Stokes and Anti-Stokes Raman Scattering

Hiroya Tsuji^1,2, Atsushi Oda³, Junji Kido^3,4, Takuro Sugiyama², and Yukio Furukawa²

¹Matsushita Electric Works, Ltd., Kadoma, Osaka 571-8686, Japan
²Department of Chemistry and Biochemistry, School of Advanced Science and Engineering, Waseda University, Shinjuku-ku, Tokyo 169-8555, Japan
³Research Institute for Organic Electronics, Yamagata Promotional Organization for Industrial Technology, Yonezawa, Yamagata 992-1128, Japan
⁴Department of Polymer Science and Engineering, Yamagata University, Yonezawa, Yamagata 992-8510, Japan

(Received September 22, 2007; accepted December 8, 2007; published online April 18, 2008)

We have measured the Stokes and anti-Stokes Raman scattering from organic light-emitting diodes based on copper phthalocyanine (CuPc), N,N'-di-1-naphthalenyl-N,N'-diphenyl-1,1'-biphenyl-4,4'-diamine (α-NPD), and tris(8-quinolinolato) aluminum(III) (Alq₃) with excitation at 633 nm. All of the observed bands have been attributed to CuPc because of the resonance Raman effect. The temperature of the CuPc layer has been obtained by taking the intensity ratio of anti-Stokes to Stokes Raman scattering of the 483 cm^-1 vibration. The temperature of the CuPc layer in the device operated at 400 mA was 140 °C.

URL: http://jjap.jsap.jp/link?JJAP/47/2171/
DOI: 10.1143/JJAP.47.2171

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