Transient Optical Properties of CsPbX3/Poly(maleic anhydride-alt-1-octadecene) Perovskite Quantum Dots for White Light-Emitting Diodes

Jian Xu, Liang Zhu, Jia Chen, Saba Riaz, Liwei Sun, Ying Wang, Wei Wang, Jun Dai

Research output: Contribution to journalArticlepeer-review

Abstract

Poly(maleic anhydride-alt-1-octadecene) (PMAO)-coated green CsPbBr3 and red CsPbBr0.6I2.4 quantum dots (QDs), as the phosphor materials for white light-emitting diodes (WLEDs), are reported. The anhydride groups of PMAO can be bound to the surface ligands of perovskite QDs and act as a protective layer. The results show that CsPbX3/PMAO (X = Cl, Br, I) presents good crystallinity and excellent luminescence properties. Time-resolved photoluminescence (TRPL) shows that the PL lifetime of CsPbX3/PMAO is prolonged, and the transient absorption (TA) results show that intraband hot-exciton relaxation and exciton recombination can be slowed down when the CsPbX3 QDs are coated with PMAO. However, the PL quantum yields (PLQYs) increase for both the green-emitting QDs and the red-emitting QDs after PMAO coating. WLED devices are fabricated by integrating the green CsPbBr3/PMAO QDs and red CsPbBr0.6I2.4/PMAO QDs on the blue GaN chips. The devices show stable white light emission with Commission Internationale de L'Eclairage (CIE) color coordinates of (0.314, 0.291). The results indicate that CsPbX3/PMAO QDs can be an ideal downconversion fluorescent material for WLED devices.

Original languageEnglish
Article number2000498
JournalPhysica Status Solidi - Rapid Research Letters
Volume15
Issue number1
Early online date1 Dec 2020
DOIs
Publication statusPublished - 12 Jan 2021

Keywords

  • perovskites
  • quantum dots
  • transient absorption
  • white light-emitting diodes

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics

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