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Optically Pumped Lasing from Hybrid Perovskite Light- Emitting Diodes

机译：混合钙钛矿发光二极管的光泵浦激光发射

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摘要

Electrically pumped lasing from hybrid organic-inorganic metal-halide perovskite semiconductors could lead to nonepitaxial diode lasers that are tunable throughout the visible and near-infrared spectrum; however, a viable laser diode architecture has not been demonstrated to date. Here, an important step toward this goal is achieved by demonstrating two distinct distributed feedback light-emitting diode architectures that achieve low threshold, optically pumped lasing. Bottom- and top-emitting perovskite light-emitting diodes are fabricated on glass and Si substrates, respectively, using a polydimethylsiloxane stamp in the latter case to nanoimprint a second-order distributed feedback grating directly into the methylammonium lead iodide active layer. The devices exhibit room temperature thresholds as low as approximate to 6 mu J cm(-2), a peak external quantum efficiency of approximate to 0.1%, and a maximum current density of approximate to 2 A cm(-2) that is presently limited by degradation associated with excessive leakage current. In this low current regime, electrical injection does not adversely affect the optical pump threshold, leading to a projected threshold current density of approximate to 2 kA cm(-2). Operation at low temperature can significantly decrease this threshold, but must overcome extrinsic carrier freeze-out in the doped organic transport layers to maintain a reasonable drive voltage.
机译：混合有机-无机金属卤化物钙钛矿半导体的电泵浦激射可能导致非外延二极管激光器在整个可见光和近红外光谱范围内可调。然而，迄今为止尚未证明可行的激光二极管架构。在这里，通过展示两种实现低阈值，光泵激激光的独特的分布式反馈发光二极管架构，可以朝着这个目标迈出重要的一步。在玻璃和硅基板上分别制造底部和顶部发光的钙钛矿发光二极管，在后一种情况下，使用聚二甲基硅氧烷印模将二阶分布反馈光栅直接纳米压印到甲基铵碘化铅有源层中。该器件的室温阈值低至大约6μJcm（-2），峰值外部量子效率大约为0.1％，最大电流密度大约为2 A cm（-2），目前受到限制由于过大的泄漏电流而导致的劣化。在这种低电流状态下，电注入不会对光泵阈值产生不利影响，从而导致预计的阈值电流密度约为2 kA cm（-2）。在低温下运行可以显着降低该阈值，但必须克服掺杂有机传输层中的外部载流子冻结，以保持合理的驱动电压。

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