Research -

Nano Opto-Electronics Lab

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noel@cuhk.edu.cn

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Cheng Dao Building 417

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Research List

Perovskite Light-Emitting Diodes Based on Perovskite Nanocrystals

Organic–inorganic hybrid perovskite materials with mixed cations have demonstrated tremendous advances in photovoltaics recently, by showing a signifcant enhancement of power conversion effciency and improved perovskite stability. The recent hot research on perovskite has demonstrated tremendous advances in photoelectronic devices. HC(NH2)2 (FA) cation based perovskite is rarely studied, espectially FA-based perovskite LEDs. Inspired by the great achievement of mixed-cation perovskite solar cells, we have synthesized mixed-cation perovskite (FA(1-x)CsxPbBr3) NCs and successfully demonstrated bright and efficient LEDs.

Ultra-low threshold InAs/GaAs quantum dot microdisk lasers on planar on-axis Si (001) substrates

Here, we present InAs/GaAs QD microdisk lasers monolithically grown on on-axis Si (001) substrate. The lasing characteristics of microdisk lasers with small diameter (D) around 2 μm and subwavelength scale (D～1.1μm) are demonstrated, with a lasing threshold as low as ～3 μW.

Ultra-low threshold InAs/GaAs quantum dot microdisk lasers on planar on-axis Si (001) substrates

Monolithic integration of efficient III–V light-emitting sources on planar on-axis Si (001) has been recognized as an enabling technology for realizing Si-based photonic integrated circuits (PICs). The field of microdisk lasers employing quantum dot (QD) materials is gaining significant momentum because it allows massive-scalable, streamlined fabrication of Si-based PICs to be made cost effectively. Here, we present InAs/GaAs QD microdisk lasers monolithically grown on on-axis Si (001) substrate with an ultra-low lasing threshold at room temperature under continuous-wave optical pumping. The lasing characteristics of microdisk lasers with small diameter (D) around 2 μm and sub-wavelength scale (D～1.1??μm) are demonstrated, with a lasing threshold as low as ～3??μW. The promising lasing characteristics of the microdisk lasers with ultra-low power consumption and small footprint represent a major advance towards large-scale, low-cost integration of laser sources on the Si platform.