TY - JOUR
T1 - Exciton diffusion in bifluorene single crystals studied by light induced transient grating technique
AU - Baronas, Paulius
AU - Ščajev, Patrik
AU - Cerkasovas, Vladislavas
AU - Kreiza, Gediminas
AU - Adomenas, Povilas
AU - Adomeniene, Ona
AU - Kazlauskas, Karolis
AU - Adachi, Chihaya
AU - Juršenas, Saulius
N1 - Funding Information:
This research was funded by a Grant (No. LJB-3/2015) from the Research Council of Lithuania. It has been supported in part by the Japan Science and Technology Agency (JST), the Exploratory Research for Advanced Technology (ERATO) program, and the Adachi Molecular Exciton Engineering Project, under JST ERATO Grant JPMJER1305.
Publisher Copyright:
© 2018 Author(s).
PY - 2018/1/15
Y1 - 2018/1/15
N2 - 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.
AB - 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.
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U2 - 10.1063/1.5008376
DO - 10.1063/1.5008376
M3 - Article
AN - SCOPUS:85041449068
SN - 0003-6951
VL - 112
JO - Applied Physics Letters
JF - Applied Physics Letters
IS - 3
M1 - 033302
ER -