2D Ruddlesden–Popper Perovskites Microring Laser Array,Advanced Materials

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2D Ruddlesden–Popper Perovskites Microring Laser Array
Advanced Materials ( IF 27.4 ) Pub Date : 2018-03-08 , DOI: 10.1002/adma.201706186
Haihua Zhang _{1,

2} , Qing Liao ₃ , Yishi Wu ₁ , Zhaoyi Zhang ₃ , Qinggang Gao ₃ , Peng Liu _{4,

5} , Meili Li _{4,

5} , Jiannian Yao ₁ , Hongbing Fu _{1,

3,

4,

5}

Affiliation

3D organic–inorganic hybrid perovskites have featured high gain coefficients through the electron–hole plasma stimulated emission mechanism, while their 2D counterparts of Ruddlesden–Popper perovskites (RPPs) exhibit strongly bound electron–hole pairs (excitons) at room temperature. High‐performance solar cells and light‐emitting diodes (LEDs) are reported based on 2D RPPs, whereas light‐amplification devices remain largely unexplored. Here, it is demonstrated that ultrafast energy transfer along cascade quantum well (QW) structures in 2D RPPs concentrates photogenerated carriers on the lowest‐bandgap QW state, at which population inversion can be readily established enabling room‐temperature amplified spontaneous emission and lasing. Gain coefficients measured for 2D RPP thin‐films (≈100 nm in thickness) are found about at least four times larger than those for their 3D counterparts. High‐density large‐area microring arrays of 2D RPPs are fabricated as whispering‐gallery‐mode lasers, which exhibit high quality factor (Q ≈ 2600), identical optical modes, and similarly low lasing thresholds, allowing them to be ignited simultaneously as a laser array. The findings reveal that 2D RPPs are excellent solution‐processed gain materials potentially for achieving electrically driven lasers and ideally for on‐chip integration of nanophotonics.

中文翻译：

二维Ruddlesden–Popper钙钛矿微环激光阵列

3D有机-无机杂化钙钛矿通过电子-空穴等离子体激发的发射机制具有高增益系数，而其Ruddlesden-Popper钙钛矿（RPP）的2D对应物在室温下表现出牢固结合的电子-空穴对（激子）。据报道，高性能太阳能电池和发光二极管（LED）基于2D RPP，而光放大设备在很大程度上尚未得到开发。在此证明，二维RPP中沿级联量子阱（QW）结构的超快速能量传输将光生载流子集中在最低带隙QW状态，在该状态下可以容易地建立种群反转，从而实现室温放大的自发发射和激射。发现对于2D RPP薄膜（厚度约100 nm）测得的增益系数至少是其3D对应薄膜的四倍。二维RPP的高密度大面积微环阵列是作为耳语-画廊模式激光器制造的，具有高品质因数（Q ≈2600），相同的光学模式，和类似的低阈值激射，允许它们同时作为激光器阵列被点燃。研究结果表明，二维RPP是出色的溶液处理增益材料，有可能实现电动激光器，并且是纳米光子在芯片上集成的理想选择。

更新日期：2018-03-08

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