Highly stable solution processed metal-halide perovskite lasers on nanoimprinted distributed feedback structures

摘要

We report on the performance and stability of distributed feedback lasers based on the solution-processed methylammonium lead iodide perovskite (CH_3NH_3PbI_3). The CH_3NH_3PbI_3 layers are processed via solution-casting in ambient atmosphere onto nanoimprinted second order Bragg gratings. This way, we achieve highly polarized surface-emitted lasing at room temperature with a linewidth of less than 0.2 nm and a laser threshold of 120kW/cm~2. The lasing is stable; no change in the laser emission within 15 h of pulsed excitation with a repetition rate of 1 kHz (corresponding to ＞5 × 10~7 pulses) is observed, exceeding the stability achieved for solution processed organic semiconductor lasers. Furthermore, adjustment of the grating period allowed the lasing wavelength to be varied over the entire bandwidth of the amplified spontaneous emission (between 781 and 794 nm). The fabrication process of nanoimprinting followed by solution-casting of the gain material demonstrates that stable CH_3NH_3PbI_3 lasers are compatible with scalable production technologies and offers a route towards electrically pumped diode architectures.