Metal halide perovskites have shown rapid development in various fields such as photovoltaics, photodetectors, light-emitting diodes (LEDs), and optically pumped lasers owing to their superior optoelectronic properties. Here, we review the basic optoelectronic properties of halide perovskites from a photophysical perspective. We highlight that halide perovskites are promising in various optoelectronic devices functioning at a wide range of carrier densities. We discuss optically and electrically generated carrier density under two different excitation modes [continuous wave (CW) and pulsed] as well as the impact of carrier density on the optoelectronic behavior of perovskites. Moreover, we discuss lasing actions at high carrier densities and summarize key rules to evaluate the lasing actions. Last, we provide an outlook on perovskite-based electrically pumped lasers.

钙钛矿金属卤化物由于其优异的光电性能，已在光伏，光电探测器，发光二极管（LED）和光泵浦激光器等各个领域迅速发展。在这里，我们从光物理的角度审查卤化物钙钛矿的基本光电性能。我们着重指出，卤化物钙钛矿有望在各种载流子密度范围内运行的各种光电器件中发挥作用。我们讨论了在两种不同的激发模式（连续波（CW）和脉冲）下光学和电产生的载流子密度，以及载流子密度对钙钛矿光电行为的影响。此外，我们讨论了高载流子密度下的激射行为，并总结了评估激射行为的关键规则。持续，