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

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

Research output: Journal article publicationJournal articleAcademic researchpeer-review

11 Citations (Scopus)


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.
Original languageEnglish
Article number4563994
Pages (from-to)19-25
Number of pages7
JournalIEEE Photonics Journal
Issue number1
Publication statusPublished - 9 Jan 2012
Externally publishedYes


  • optical properties of photonic materials
  • Photonic materials

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Electrical and Electronic Engineering

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