Improvement of thermal stability of type-II composition-gradient thick-shell quantum dots green light-emitting diodes

Hsin-Chieh Yu*, Hoang Tuan Vu

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Improvement of thermal stability of green quantum dot light emitting diodes (QD-LEDs) was demonstrated by using composition-gradient thick-shell CdSe@ZnS/ZnS quantum dots (QDs). The electroluminescence intensity only decreased 3% even when the operation temperature was elevated to 110 °C. The current efficiency roll-off effect was improved nearly 200% under higher current density. Thick-shell QDs with low defective structure could effectively prevent the electron-hole pairs from nonradiative Auger recombination and avoid the thermal-stress-induced expansion at higher temperatures and driving current. The maximum current efficiency of the thick-shell-device is 10.3 cd/A, which is much higher than 1.57 cd/A for the conventional thin-shell-device.

Original languageEnglish
Title of host publicationLight-Emitting Diodes
Subtitle of host publicationMaterials, Devices, and Applications for Solid State Lighting XXI
EditorsMichael R. Krames, Jong Kyu Kim, Li-Wei Tu, Martin Strassburg
PublisherSPIE
ISBN (Electronic)9781510606890
DOIs
StatePublished - 1 Jan 2017
EventLight-Emitting Diodes: Materials, Devices, and Applications for Solid State Lighting XXI 2017 - San Francisco, United States
Duration: 30 Jan 20171 Feb 2017

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume10124
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X

Conference

ConferenceLight-Emitting Diodes: Materials, Devices, and Applications for Solid State Lighting XXI 2017
CountryUnited States
CitySan Francisco
Period30/01/171/02/17

Keywords

  • current efficiency
  • light-emitting diodes
  • thermal stability
  • Thick-shell quantum dots
  • type-II

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