Observation of phosphorescence from fluorescent organic material Bebq2 using phosphorescent sensitizer
✍ Scribed by Taiju Tsuboi; Woo Sik Jeon; Jang Hyuk Kwon
- Publisher
- Elsevier Science
- Year
- 2009
- Tongue
- English
- Weight
- 709 KB
- Volume
- 31
- Category
- Article
- ISSN
- 0925-3467
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✦ Synopsis
Absorption, emission and excitation spectra of bis(10-hydroxybenzo [h] quinolinato)-beryllium (Bebq 2 ) were studied using polystyrene film doped with 5 wt% Bebq 2 , N,N-di(naphthalene-1-yl)-N,N-diphenylbenzidene (NPB) film doped with 60 wt% Bebq 2 , and neat film. The monomer and aggregate of Bebq 2 give fluorescence at 492 and 511 nm at 12 K, respectively. A strong T 1 emission with a vibronic structure was observed from Bebq 2 below 70 K by heavily doping with phosphorescent tris(2-phenylpyridine) iridium [Ir(ppy) 3 ]. The T 1 energy of Bebq 2 was estimated to be 2.26 eV from the onset of the 573 nm 0-0 vibronic emission band. The energy transfer mechanism from Ir(ppy) 3 to the T 1 state of Bebq 2 is discussed.