Light-Induced Photoluminescence Switching Using Liquid Crystal-Dispersed Quantum Dots

IEEE Photonics Journal

卷:4

Min-Chi Cheng¹  Chih-Chien Chu²  Wei-Ting Chang³  Ken-Tye Yong⁴  Wing-Cheung Law⁵  Yu-Chuan Su⁶  Vincent K. S. Hsiao⁶  Paras N. Prasad⁷ 

[1] $^{1}$ Department of Applied Materials and Optoelectronic Engineering, National Chi Nan University, NanTou, Taiwan;

[2] $^{2}$ Department of Applied Chemistry, Chung Shan Medical University, Taichung, Taiwan;

[3] $^{3}$ Department of Applied Chemistry, National Chi Nan University, NanTou, Taiwan;

[4] $^{4}$School of Electrical and Electronic Engineering, Nanyang Technological University, Singapore;

[5] $^{5}$Institute for Lasers, Photonics, and Biophotonics, University at Buffalo, Buffalo, NY , USA;

[6] Department of Applied Materials and Optoelectronic Engineering, National Chi Nan University, NanTou, Taiwan;

[7] Institute for Lasers, Photonics, and Biophotonics, University at Buffalo, Buffalo, NY, USA;

关键词: Photonic materials;    optical properties of photonic materials;   

DOI  :  10.1109/JPHOT.2011.2179289

来源: DOAJ

【 摘 要 】

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.

【 授权许可】

Unknown