Highly stable CsPbBr3 quantum dots coated with alkyl phosphate for white light-emitting diodes

Tongtong Xuan, Xianfeng Yang, Sunqi Lou, Junjian Huang, Yong Liu, Jinbo Yu, Huili Li, Ka-Leung WONG, Chengxin Wang, Jing Wang*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

141 Citations (Scopus)

Abstract

Inorganic halide perovskite quantum dots (QDs) suffer from problems related to poor water stability and poor thermal stability. Here we developed a simple strategy to synthesize alkyl phosphate (TDPA) coated CsPbBr3 QDs by using 1-tetradecylphosphonic acid both as the ligand for the CsPbBr3 QDs and as the precursor for the formation of alkyl phosphate. These QDs not only retain a high photoluminescence quantum yield (PLQY, 68%) and narrow band emission (FHWM ∼ 22 nm) but also exhibit high stability against water and heat. The relative PL intensity of the QDs was maintained at 75% or 59% after being dispersed in water for 5 h or heated to 375 K (100 °C), respectively. Finally, white light-emitting diodes (WLEDs) with a high luminous efficiency of 63 lm W-1 and a wide color gamut (122% of NTSC) were fabricated by using green-emitting CsPbBr3/TDPA QDs and red-emitting K2SiF6:Mn4+ phosphors as color converters. The luminous efficiency of the WLEDs remained at 90% after working under a relative humidity (RH) of 60% for 15 h, thereby showing promise for use as backlight devices in LCDs.

Original languageEnglish
Pages (from-to)15286-15290
Number of pages5
JournalNanoscale
Volume9
Issue number40
DOIs
Publication statusPublished - 28 Oct 2017

Scopus Subject Areas

  • Materials Science(all)

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