Phosphine-free-synthesized znse/zns core/shell quantum dots for white light-emitting diodes

Nyamsuren Byambasuren, Jiyeon Jo, Hyungduk Ko, Byeong Kwon Ju, Ji Young Byun, Ho Seong Jang

Research output: Contribution to journalArticlepeer-review

Abstract

Blue-light-emitting ZnSe core (C) and ZnSe/ZnS core/shell (C/S) quantum dots (QDs) were synthesized with phosphine-free precursors by a thermal decomposition method in paraffin oil solvent and applied to QD-converted light-emitting diodes (LEDs). The optical properties of the synthesized ZnSe C and ZnSe/ZnS C/S QDs were characterized by absorption spectroscopy and photoluminescence spectroscopy. Additionally, the quantum efficiency of the QDs was investigated. Their structural properties were studied with X-ray crystallography and transmission electron microscopy. The ZnSe/ZnS C/S QDs showed deep-blue light peaking at 425 nm. The blue-lightemitting ZnSe/ZnS C/S QDs were used as color-converting materials for near-ultraviolet LEDpumped blue LEDs and combined with yellow-light-emitting Zn-Cu-In-S/ZnS C/S QDs to fabricate white LEDs. The white LEDs showed warm white light [(CIE x, CIE y) = (0.4088, 0.3987)], Tc = 3488 K, and Ra = 61.2]. The results indicate that the ZnSe/ZnS C/S QDs have good potential for white light application after further improvements to their optical properties.

Original languageEnglish
Article number10060
JournalApplied Sciences (Switzerland)
Volume11
Issue number21
DOIs
Publication statusPublished - 2021 Nov 1

Keywords

  • Blue LED
  • Core/shell structure
  • Warm white LED
  • ZnSe/ZnS quantum dots

ASJC Scopus subject areas

  • Materials Science(all)
  • Instrumentation
  • Engineering(all)
  • Process Chemistry and Technology
  • Computer Science Applications
  • Fluid Flow and Transfer Processes

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