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

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

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.

Original languageEnglish
Article number033302
JournalApplied Physics Letters
Volume112
Issue number3
DOIs
Publication statusPublished - Jan 15 2018

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excitons
gratings
organic lasers
single crystals
diffusion coefficient
laser applications
diffusion length
crystals
ethylene
life (durability)
thresholds
coefficients

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

Cite this

Baronas, P., Ščajev, P., Cerkasovas, V., Kreiza, G., Adomenas, P., Adomeniene, O., ... Juršenas, S. (2018). Exciton diffusion in bifluorene single crystals studied by light induced transient grating technique. Applied Physics Letters, 112(3), [033302]. https://doi.org/10.1063/1.5008376

Exciton diffusion in bifluorene single crystals studied by light induced transient grating technique. / Baronas, Paulius; Ščajev, Patrik; Cerkasovas, Vladislavas; Kreiza, Gediminas; Adomenas, Povilas; Adomeniene, Ona; Kazlauskas, Karolis; Adachi, Chihaya; Juršenas, Saulius.

In: Applied Physics Letters, Vol. 112, No. 3, 033302, 15.01.2018.

Research output: Contribution to journalArticle

Baronas, P, Ščajev, P, Cerkasovas, V, Kreiza, G, Adomenas, P, Adomeniene, O, Kazlauskas, K, Adachi, C & Juršenas, S 2018, 'Exciton diffusion in bifluorene single crystals studied by light induced transient grating technique', Applied Physics Letters, vol. 112, no. 3, 033302. https://doi.org/10.1063/1.5008376
Baronas P, Ščajev P, Cerkasovas V, Kreiza G, Adomenas P, Adomeniene O et al. Exciton diffusion in bifluorene single crystals studied by light induced transient grating technique. Applied Physics Letters. 2018 Jan 15;112(3). 033302. https://doi.org/10.1063/1.5008376
Baronas, Paulius ; Ščajev, Patrik ; Cerkasovas, Vladislavas ; Kreiza, Gediminas ; Adomenas, Povilas ; Adomeniene, Ona ; Kazlauskas, Karolis ; Adachi, Chihaya ; Juršenas, Saulius. / Exciton diffusion in bifluorene single crystals studied by light induced transient grating technique. In: Applied Physics Letters. 2018 ; Vol. 112, No. 3.
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