Room-Temperature Near-Infrared High-Q Perovskite Whispering-Gallery Planar Nanolasers

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• 作者：Qing Zhang ; Son Tung Ha ; Xinfeng Liu ; Tze Chien Sum ; Qihua Xiong
• 刊名：Nano Letters
• 出版年：2014
• 出版时间：October 8, 2014
• 年：2014
• 卷：14
• 期：10
• 页码：5995-6001
• 全文大小：1991K
• ISSN：1530-6992

文摘

Near-infrared (NIR) solid-state micro/nanolasers are important building blocks for true integration of optoelectronic circuitry.1 Although significant progress has been made in III鈥揤 nanowire lasers with achieving NIR lasing at room temperature,2鈭? challenges remain including low quantum efficiencies and high Auger losses. Importantly, the obstacles toward integrating one-dimensional nanowires on the planar ubiquitous Si platform need to be effectively tackled. Here we demonstrate a new family of planar room-temperature NIR nanolasers based on organic鈥搃norganic perovskite CH₃NH₃PbI_3-aX_a (X = I, Br, Cl) nanoplatelets. Their large exciton binding energies, long diffusion lengths, and naturally formed high-quality planar whispering-gallery mode cavities ensure adequate gain and efficient optical feedback for low-threshold optically pumped in-plane lasing. We show that these remarkable wavelength tunable whispering-gallery nanolasers can be easily integrated onto conductive platforms (Si, Au, indium tin oxide, and so forth). Our findings open up a new class of wavelength tunable planar nanomaterials potentially suitable for on-chip integration.

Keywords:

Organic鈭抜norganic perovskites; whispering gallery mode lasing; near-infrared lasers; nanoplatelets; wavelength tunable; on-chip integration