Title :
Light-Induced Photoluminescence Switching Using Liquid Crystal-Dispersed Quantum Dots
Author :
Cheng, Min-Chi ; Chu, Chih-Chien ; Su, Yu-Chuan ; Chang, Wei-Ting ; Hsiao, Vincent K S ; Yong, Ken-Tye ; Law, Wing-Cheung ; Prasad, Paras N.
Author_Institution :
Dept. of Appl. Mater. & Optoelectron. Eng., Nat. Chi Nan Univ., Nantou, Taiwan
Abstract :
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.
Keywords :
isomerisation; liquid crystals; optical switches; organic compounds; photochemistry; photoluminescence; quantum dots; self-induced transparency; LC cell; LC-infiltrated tube; azobenzene-doped liquid crystal; excitation photons; light irradiation; light-induced photoluminescence switching; liquid crystal-dispersed quantum dots; modulating technique; multiple scattering; trans-to-cis photoisomerization; transparent; Electron tubes; Optical filters; Optical imaging; Optical scattering; Optical switches; Photonics; Radiation effects; Photonic materials; optical properties of photonic materials;
Journal_Title :
Photonics Journal, IEEE
DOI :
10.1109/JPHOT.2011.2179289
