The stability improvement of wide emission Zn0.8Cd0.2S quantum dot for white light-emitting diodes

Cyuan Bin Siao, Shu Ru Chung, Kuan Wen Wang

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

2 Scopus citations

Abstract

Recently, the investigation of quantum dots (QDs) as color converters for white light-emitting diodes (WLEDs) has attracted a significant amount of attention, because the emission wavelength and broad excitation band of QDs can be controlled by their particle sizes and compositions. However, owing to the thermal effect, the long-term stability of QDWLEDs is one of the important tasks for their application. Moreover, the commercial WLEDs have low color rendering index (CRI) and the reabsorption effect. Therefore, in order to increase the device stability and CRI, in this study, we have used easy one-pot process to synthesize the colloidal ternary Zn0.8Cd0.2S (ZnCdS) QDs with wide emission, a quantum yield (QY) of 42 % and a particle size of 3.2 ± 0.5 nm. Three methods have been applied to encapsulate the QDs and their average CRIs are 78. We have demonstrated that the QDs-based WLEDs can achieve color converter robust against photooxidation, thermal quenching, and scattering, and can be applied to fabricate reliable P-QD1 device with an air gap between the emission layers. This encapsulation setup can protect the color converter and maintain the best stability over 750 hours operation time, and the Commission International d'Eclairage (CIE) chromaticity coordinates and luminous efficacy can be tuned from (0.36, 0.40) to (0.32, 0.33) and 4.5 to 3.2, respectively.

Original languageEnglish
Title of host publicationFifteenth International Conference on Solid State Lighting and LED-Based Illumination Systems
EditorsNikolaus Dietz, Matthew H. Kane, Ian T. Ferguson
PublisherSPIE
ISBN (Electronic)9781510602991
DOIs
StatePublished - 2016
Event15th International Conference on Solid State Lighting and LED-Based Illumination Systems - San Diego, United States
Duration: 31 Aug 2016 → …

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume9954
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X

Conference

Conference15th International Conference on Solid State Lighting and LED-Based Illumination Systems
Country/TerritoryUnited States
CitySan Diego
Period31/08/16 → …

Keywords

  • color rendering index
  • efficacy
  • P-QD1
  • stability
  • white light-emitting diodes
  • ZnCdS

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