Halide perovskites are under intense investigation for light harvesting applications in solar cells. Their outstanding optoelectronic properties such as long charge carrier diffusion lengths, high absorption coefficients, and defect tolerance also has triggered interest in laser and LED applications. Here, we report on the lasing properties of 3D distributed feedback halide perovskite nanostructures prepared via an all-solution process. A colloidal crystal templating approach was developed to precisely control the hybrid halide perovskite structure on the nanoscale. The prepared CH₃NH₃PbBr₃ thin films with inverse opal morphology show narrow lasing emissions with a full width half-maximum as low as 0.15 nm and good long-term stability under pulsed laser excitation above the lasing threshold of 1.6 mJ cm^–2 in ambient atmosphere. Furthermore, lasing emission was also observed for CH₃NH₃PbI₃ inverse opals under excitation with a focused laser beam. Unlike other protocols for the fabrication of distributed feedback perovskite lasers, control of the nanostructure of hybrid halide perovskites is achieved without the use of expensive and elaborate lithography techniques or high temperatures. Therefore, the presented protocol opens a route to the low cost fabrication of hybrid halide perovskite lasers.

中文翻译：

---

卤化物钙钛矿3D光子晶体，用于分布式反馈激光器

卤化物钙钛矿正被广泛研究用于太阳能电池中的光收集应用。它们出色的光电特性，例如长的载流子扩散长度，高的吸收系数和缺陷容限，也引起了激光和LED应用的兴趣。在这里，我们报告通过全溶液工艺制备的3D分布式反馈卤化物钙钛矿纳米结构的激光性能。开发了胶体晶体模板方法以在纳米级上精确地控制杂化卤化物钙钛矿结构。制备的CH ₃ NH ₃ PbBr ₃具有反蛋白石形态的薄膜显示出窄的激光发射，全宽度半最大值低至0.15 nm，并且在脉冲激光激发下，在环境大气中的激光阈值高于1.6 mJ cm ^–2时，具有良好的长期稳定性。此外，在聚焦激光束激发下，CH ₃ NH ₃ PbI ₃反蛋白石也观察到激光发射。与用于制造分布式反馈钙钛矿激光器的其他协议不同，无需使用昂贵且复杂的光刻技术或高温即可实现混合卤化物钙钛矿纳米结构的控制。因此，提出的协议为混合卤化物钙钛矿激光器的低成本制造开辟了一条途径。