The lasing properties of a 4,4’-bis[(N-carbazole)styryl]biphenyl (BSBCz)1 thin film under electrical pumping are investigated. Here, we report the first demonstration of organic semiconductor laser diodes (Fig. 1). The devices incorporate a mixed-order distributed feedback SiO_2 grating in an organic light-emitting diode structure and emit blue lasing. The lasing by direct injection of current into an organic thin film can be achieved through the selection of the high-gain organic semiconductor of BSBCz showing clear separation of the lasing wavelength from significant triplet2 and polaron absorptions, and the design of a proper feedback structure to suppress losses at high current densities.1 The results fully support the claim that this is the first observation of electrically pumped lasing in organic semiconductors. The low losses in BSBCz are integral to enabling lasing, so the development of new laser molecules with advanced optoelectronic properties is an important next step.
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