15 May 2008 Measurement of triplet exciton diffusion in the context of organic lasers
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Abstract
Although optically pumped semiconductor organic lasers have been reported for a decade, no electrically pumped organic laser diode has been till now realized. Charge-induced and triplet excited state absorption have been identified as major bottlenecks: in this context exciton dynamic plays a key role. We report on the measurement of exciton diffusion lengths in the archetypal ambipolar material CBP, in the presence of an injected current in a working multilayer device. The technique is based on moving a thin red phosphorescent layer away from the recombination zone. The amount of emitted light depends on the layer position via the diffusion of triplet excitons. We demonstrate the crucial importance of designing the structure according to optical field calculations in order to measure diffusion lengths LD. We measured a value of LD = 16 nm +/- 4 nm in CBP, and also report on the variation of LD with the injected current.
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H. Choukri, H. Choukri, M. Lebental, M. Lebental, S. Forget, S. Forget, S. Chénais, S. Chénais, D. Adès, D. Adès, A. Siove, A. Siove, B. Geffroy, B. Geffroy, "Measurement of triplet exciton diffusion in the context of organic lasers", Proc. SPIE 6999, Organic Optoelectronics and Photonics III, 699908 (15 May 2008); doi: 10.1117/12.783255; https://doi.org/10.1117/12.783255
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