Optimization of Illumination Performance of Trichromatic White Light-Emitting Diode and Characterization of Its Modulation Bandwidth for Communication Applications

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalNot applicablepeer-review

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Author(s)

  • Xiangtian Xiao
  • Kai Wang
  • Rui Wang
  • Bin Xie

Related Research Unit(s)

Detail(s)

Original languageEnglish
Article number8201511
Journal / PublicationIEEE Photonics Journal
Volume10
Issue number5
Early online date1 Oct 2018
Publication statusPublished - Oct 2018

Abstract

We study a trichromatic white light-emitting diode (WLED) system that consists of a blue LED covered with layers of red emissive CdSe/ZnS quantum dots (QDs) and yellow emissive YAG:Ce3+ phosphors. Here,we develop a method of determining the right amounts of QDs and phosphors to optimize the illumination performance of the WLED. The predicted performances of the WLEDs obtained from our method agree well with experimental results. With this method, we are able to produce white light with, for example, a high color-rendering index of 95.4 and an R9 value of 95.0 at a correlated color temperature (CCT) of 3640 K. We also analyze the modulation characteristics of this WLED system for visible light communication (VLC). By combining the frequency responses of the blue LED, the QDs, and the phosphors, we are able to accurately predict the overall frequency responses and the bandwidths of the WLEDs that have various CCTs and thus optimize the bandwidth of the WLED. Our approach of optimizing the performance of a WLED, as verified by our measurement data, is simple and general and can facilitate the selection of suitable light-conversion materials for combined illumination and VLC applications.

Research Area(s)

  • Absorption, Light emitting diodes, Light-emitting diodes, Lighting, Modulation, Optical communication, Optical materials, Optical variables measurement, Optimization, Phosphors, Quantum-dot devices

Citation Format(s)

Optimization of Illumination Performance of Trichromatic White Light-Emitting Diode and Characterization of Its Modulation Bandwidth for Communication Applications. / Xiao, Hua; Xiao, Xiangtian; Wang, Kai; Wang, Rui; Xie, Bin; Chiang, Kin Seng.

In: IEEE Photonics Journal, Vol. 10, No. 5, 8201511, 10.2018.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalNot applicablepeer-review