Open AccessLight-Induced Photoluminescence Switching Using Liquid Crystal-Dispersed Quantum Dots
Author(s) -
Min-Chi Cheng,
Chih-Chien Chu,
Yu-Chuan Su,
Wei-Ting Chang,
Vincent K. S. Hsiao,
Ken-Tye Yong,
Wing-Cheung Law,
Paras N. Prasad
Publication year - 2012
Publication title -
ieee photonics journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.725
H-Index - 73
eISSN - 1943-0655
pISSN - 1943-0647
DOI - 10.1109/jphot.2011.2179289
Subject(s) - engineered materials, dielectrics and plasmas , photonics and electrooptics
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.