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Record-Low-Threshold Lasers Based on Atomically Smooth Triangular Nanoplatelet Perovskite

机译：基于原子光滑三角形纳米片钙钛矿的低阈值记录激光

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摘要

Single-crystalline perovskites are ideal candidates for lasing and other optoelectronic applications. Although significant efforts have been made to grow both bulk single-crystalline perovskites in liquid solution, their dimensions are still too large to make nanoscale whispering-gallery-mode (WGM) resonator based lasers that possess high quality (Q) factor and small volume. Besides, most reported perovskite resonators do not possess atomically smooth surfaces and facets, which limits the Q and thereby increases the lasing threshold. Here, atomically smooth triangular PbI2 templates are fabricated on a mica substrate by the vapor phase deposition method and are converted to atomically smooth perovskites which have regular and unwrinkled facets with average surface roughness less than 2 nm. By using a CH3NH3PbI3 nanoplatelet with a side length of 27 mu m and thickness of 80 nm, room temperature WGM lasing with a Q up to 2600 is demonstrated, the highest reported for hybrid organic-inorganic perovskite nanoplatelets. In addition, the volume of the WGM mode is reduced significantly in comparison with the prior reports. The realized high-quality triangular CH3NH3PbI3 perovskite nanoplatelets with high Q factor and small volume are expected to perform as ideal cavities for long pulse durations lasers and would find potential applications in integrated optoelectronic devices.
机译：单晶钙钛矿是激光和其他光电应用的理想选择。尽管已经做出了巨大的努力来使两种块状单晶钙钛矿都在液体溶液中生长，但是它们的尺寸仍然太大，以至于无法制造出具有高质量（Q）因子和小体积的纳米级耳语-画廊模式（WGM）谐振器激光器。此外，大多数报道的钙钛矿谐振器不具有原子上光滑的表面和小平面，这限制了Q并因此增加了激射阈值。在此，通过气相沉积法在云母基板上制造原子光滑的三角形PbI2模板，并将其转换为原子规则的钙钛矿，该钙钛矿具有规则且无褶皱的小面，平均表面粗糙度小于2 nm。通过使用边长为27μm，厚度为80 nm的CH3NH3PbI3纳米血小板，可以证明Q值高达2600的室温WGM激光发射，是有机-无机钙钛矿杂化纳米片报道的最高记录。此外，与以前的报告相比，WGM模式的体积大大减少了。具有高Q值和小体积的高质量三角形CH3NH3PbI3钙钛矿纳米片有望作为长脉冲持续时间激光器的理想腔体，并将在集成光电器件中找到潜在的应用。

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  • 来源
    《Advanced Functional Materials》 |2019年第2期|1805553.1-1805553.7|共7页
  • 作者

    Li Guohui; Che Tao; Li Xingqi; Liu Shaoding; Hao Yuying; Cui Yanxia; Liu Shengzhong;

  • 作者单位

    Taiyuan Univ Technol, Key Lab Adv Transducers & Intelligent Control Sys, Key Lab Interface Sci & Engn Adv Mat, Minist Educ,Coll Phys & Optoelect, Taiyuan 030024, Shanxi, Peoples R China;

    Taiyuan Univ Technol, Key Lab Adv Transducers & Intelligent Control Sys, Key Lab Interface Sci & Engn Adv Mat, Minist Educ,Coll Phys & Optoelect, Taiyuan 030024, Shanxi, Peoples R China;

    Taiyuan Univ Technol, Key Lab Adv Transducers & Intelligent Control Sys, Key Lab Interface Sci & Engn Adv Mat, Minist Educ,Coll Phys & Optoelect, Taiyuan 030024, Shanxi, Peoples R China;

    Taiyuan Univ Technol, Key Lab Adv Transducers & Intelligent Control Sys, Key Lab Interface Sci & Engn Adv Mat, Minist Educ,Coll Phys & Optoelect, Taiyuan 030024, Shanxi, Peoples R China;

    Taiyuan Univ Technol, Key Lab Adv Transducers & Intelligent Control Sys, Key Lab Interface Sci & Engn Adv Mat, Minist Educ,Coll Phys & Optoelect, Taiyuan 030024, Shanxi, Peoples R China;

    Taiyuan Univ Technol, Key Lab Adv Transducers & Intelligent Control Sys, Key Lab Interface Sci & Engn Adv Mat, Minist Educ,Coll Phys & Optoelect, Taiyuan 030024, Shanxi, Peoples R China|Shanxi Univ, State Key Lab Quantum Opt & Quantum Opt Devices, Taiyuan 030006, Shanxi, Peoples R China;

    Shaanxi Normal Univ, Key Lab Appl Surface & Colloid Chem, Shaanxi Engn Lab Adv Energy Technol, Natl Minist Educ,Sch Mat Sci & Engn, Xian 710119, Shaanxi, Peoples R China;

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  • 关键词

    atomically smooth; lasers; low-threshold; nanoplatelet perovskites;

    机译：原子光滑;激光;低阈值;纳米血小板钙钛矿;

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