Light-induced photoluminescence switching using liquid crystal-dispersed quantum dots

Light-induced photoluminescence switching using liquid crystal-dispersed quantum dots

Light-induced photoluminescence (PL) switching using azobenzene-doped liquid crystal (LC)-dispersed quantum dots (QDs) is demonstrated in a format of LC cell and LC-infiltrated tube. Before light irradiation, excitation photons undergo multiple scattering events before emission out of the LC cell, a...

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Bibliographic Details
Main Authors: Hsiao, Vincent K. S., Prasad, Paras N., Cheng, Min-Chi, Chu, Chih-Chien, Su, Yu-Chuan, Chang, Wei-Ting, Yong, Ken-Tye, Law, Wing-Cheung
Other Authors: School of Electrical and Electronic Engineering
Format: Article
Language:English
Published: 2013
Subjects:
DRNTU::Engineering::Electrical and electronic engineering
Online Access:https://hdl.handle.net/10356/98951
http://hdl.handle.net/10220/13466
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Institution: Nanyang Technological University
Language: English
Description
Summary:Light-induced photoluminescence (PL) switching using azobenzene-doped liquid crystal (LC)-dispersed quantum dots (QDs) is demonstrated in a format of LC cell and LC-infiltrated tube. Before light irradiation, excitation photons undergo multiple scattering events before emission out of the LC cell, and PL intensity is high. Upon the light irradiation, the trans-to-cis photoisomerization of azobenzene makes the QD-dispersed LCs highly transparent, thus allowing most excitation photons to pass through LCs and decrease PL intensity. This demonstration may allow a new modulating technique for future development of light-switchable, QD-emission-based display or photonic devices.

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