Proceedings of International Conference on Perovskite and Organic Photovoltaics and Optoelectronics (IPEROP19)
Publication date: 23rd October 2018
Organometal halide perovskites have been attracting attention not only in the photovoltaic field but also in the optoelectronic field [1]. High luminescence yield, emission-wavelength tunability and capability for solution process bring out great potential of this material for light-emitting diode (LED) and laser applications [2]. Although those single-crystalline perovskites are the most promising lasing media, it is not easy to control the crystallinity and to be assembled into practical laser devices.
Simple “microcapillary method” enables us to prepare crystalline perovskites of methylammonium-lead-bromide (CH3NH3PbBr3) in a cylindrical microcavity. A precursor solution of CH3NH3PbBr3 is injected by capillary action into quartz microcapillaries with an inner diameter (ϕ) of 2–40 μm. After drying at 70 °C in the atmosphere, CH3NH3PbBr3 crystals are precipitated to fill up the inner cavity of the microcapillary.
In this work, we fabricate light-emitting electrochemical cell (LEC) structure aiming at current-injection laser devices with perovskites. For this purpose, polyethylene-oxide (PEO) is added to the perovskite precursor solution and homogeneous perovskite/PEO composites is crystallized inside the microcapillaries. Under optical pumping, whispering gallery mode (WGM) lasing depending on ϕ is observed. Their lasing threshold fluence of the perovskite/PEO composite crystal is lower than that of the perovskite crystal without PEO.
With reducing ϕ, the mode number and the lasing threshold fluence are found to be decreased. This suggests that the stimulated emission can be enhanced by cavity quantum electrodynamics (cavity-QED) in the CH3NH3PbBr3 crystals densely confined in the microcavity [3]. In the time-resolved photoluminescence measurement, the faster lifetime component (τ1) decreases with reducing ϕ. This result suggests that the spontaneous emission rate is enhanced by the Purcell effect and supports the cavity-QED effect.
This work is supported by the NAIST Special Fund. We would also like to acknowledge S. Katao and N. Koike, Nara Institute of Science and Technology, for the experimental support.
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