Application of energy transfer model to partially DCM-doped Alq3 light-emitting diode
✍ Scribed by Tatsuo Mori; Teruyoshi Mizutani
- Publisher
- John Wiley and Sons
- Year
- 1997
- Tongue
- English
- Weight
- 135 KB
- Volume
- 8
- Category
- Article
- ISSN
- 1042-7147
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✦ Synopsis
The electroluminescent (EL) properties of partially-DCM doped Alq 3 (tris(8-quinoline) aluminum) light-emitting diodes (LEDs) are discussed on the basis of a simple energy transfer model due to exciton diffusion. The EL process is described as the product of the distribution of exciton density of Alq 3 and the radiative probability of excited molecule. Using the separated EL intensities from Alq 3 and DCM, the various ratios of EL intensities calculated from the model were compared with the experimental results. The diffusion length of the Alq 3 exciton was estimated to be 20 nm. The radiative probability of DCMdoped Alq 3 was found to be 4.4 times higher than that of Alq 3 . The ratio of the former to the latter almost agreed with the ratio of the quantum photoluminescent yield. The doped DCM molecules are speculatd to suppress the generation of the Alq 3 exciton. The model is very simple, but explains the practical EL characteristics in organic dye-doped Alq 3 LEDs.