Exciton diffusion in bifluorene single crystals studied by light induced transient grating technique

Paulius Baronas, Patrik Ščajev, Vladislavas Cerkasovas, Gediminas Kreiza, Povilas Adomenas, Ona Adomeniene, Karolis Kazlauskas, Chihaya Adachi, Saulius Juršenas

研究成果: Contribution to journalArticle査読

9 被引用数 (Scopus)

抄録

Exciton diffusion is considered to be of prime importance for controlling the recombination zone in organic light emitting devices. This is particularly relevant for organic lasers based on single crystals, where undesirable exciton-exciton annihilation at high concentrations is inevitable. Here, exciton diffusion is studied in bifluorene single crystals specifically designed for organic laser applications, therefore featuring exceptionally low threshold of light amplification. The non-destructive light induced transient grating (LITG) technique capable of simultaneously evaluating the exciton lifetime and diffusion coefficient along different directions of the crystal was employed for this study. Highly anisotropic singlet exciton diffusion with the diffusion coefficient varying from <0.05 up to 0.96 cm2/s (in a perpendicular direction) and the corresponding diffusion lengths changing from <60 up to 300 nm, respectively, was revealed in ethylene-bridged bifluorene crystals. The LITG results on the directionality of exciton diffusion are anticipated to be essential for devising single crystal based organic lasers.

本文言語英語
論文番号033302
ジャーナルApplied Physics Letters
112
3
DOI
出版ステータス出版済み - 1 15 2018

All Science Journal Classification (ASJC) codes

  • 物理学および天文学(その他)

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