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Title: Whispering gallery mode lasing from hexagonal shaped layered lead iodide crystals
Authors: Liu, Xinfeng
Ha, Son Tung
Zhang, Qing
de la Mata, Maria
Magen, César
Arbiol, Jordi
Sum, Tze Chien
Xiong, Qihua
Keywords: DRNTU::Science::Chemistry::Crystallography
Issue Date: 2015
Source: Liu, X., Ha, S. T., Zhang, Q., de la Mata, M., Magen, C., Arbiol, J., et al. (2015). Whispering gallery mode lasing from hexagonal shaped layered lead iodide crystals. ACS nano, 9(1), 687-695.
Series/Report no.: ACS nano
Abstract: We report on the synthesis and optical gain properties of regularly shaped lead iodide (PbI2) platelets with thickness ranging from 10–500 nm synthesized by chemical vapor deposition methods. The as-prepared single crystalline platelets exhibit a near band edge emission of ∼500 nm. Whispering gallery mode (WGM) lasing from individual hexagonal shaped PbI2 platelets is demonstrated in the temperature-range of 77–210 K, where the lasing modes are supported by platelets as thin as 45 nm. The finite-difference time-domain simulation and the edge-length dependent threshold confirm the planar WGM lasing mechanism in such hexagonal shaped PbI2 platelet. Through a comprehensive study of power-dependent photoluminescence (PL) and time-resolved PL spectroscopy, we ascribe the WGM lasing to be biexcitonic in nature. Moreover, for different thicknesses of platelet, the lowest lasing threshold occurs in platelets of ∼120 nm, which attributes to the formation of a good Fabry–Pérot resonance cavity in the vertical direction between the top and bottom platelet surfaces that enhances the reflection. Our present study demonstrates the feasibility of planar light sources based on layered semiconductor materials and that their thickness-dependent threshold characteristic is beneficial for the optimization of layered material based optoelectronic devices.
DOI: 10.1021/nn5061207
Schools: School of Electrical and Electronic Engineering 
School of Physical and Mathematical Sciences 
Research Centres: Energy Research Institute @ NTU (ERI@N) 
Rights: © 2015 American Chemical Society. This is the author created version of a work that has been peer reviewed and accepted for publication by ACS Nano, American Chemical Society. It incorporates referee’s comments but changes resulting from the publishing process, such as copyediting, structural formatting, may not be reflected in this document. The published version is available at: [].
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:EEE Journal Articles
ERI@N Journal Articles
SPMS Journal Articles

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