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Location:Main Hall "Artis Centrum Hotel" (Address: Totoriu str. 23, Vilnius, LT-01120, Lithuania)
9:00 - 9:45 ID: 258 Oral presentation
ORGANIC SEMICONDUCTOR LASERS UNDER OPTICAL AND ELECTRICAL EXCITATION
Kyushu University, Fukuoka, Japan
Organic laser diodes (OSLDs) are one of ultimate organic light emitting devices that cover the visible and near infrared spectra and a major advance toward future organic optoelectronic integrated circuits. In this report, the lasing behavior of a 4,4’-bis[(N-carbazole)styryl]biphenyl (BSBCz) 1 thin film under CW photoexcitation and electrical pumping are investigated. Present laser diodes are primarily based on inorganic semiconductors, but organics can also be an excellent gain media with unique device architectures. However, electrically driven organic semiconductor laser diodes have not yet been realized despite the advances in optically pumped organic semiconductor lasers. Here, we report our attempt of organic semiconductor laser diodes. The devices incorporate a mixed-order distributed feedback (DFB) SiO2 grating in an organic light-emitting diode structure and emit blue lasing and this device architecture allows lasing by optical-pump and direct injection of current into an organic thin film. It is critical to have a high-gain organic semiconductor layer showing clear separation of the lasing wavelength from significant triplet2 and polaron absorptions and design of a proper feedback structure to suppress losses at high current densities. We report the cutting-edge organic laser materials’ design including the possibility of TADF lasers.
1) T. Aimono, et al., Appl. Phys. Lett. 2005, 86, 071110.
2) A. S. D. Sandanayaka, et al., Science Adv. 2017, 3, e1602570.