Facile synthesis of thermally stable CsPbBr3 perovskite quantum dot-inorganic SiO2 composites and their application to white light-emitting diodes with wide color gamut

Da Hye Park, Joon Soo Han, Woong Kim, Ho Seong Jang

Research output: Contribution to journalArticle

37 Citations (Scopus)

Abstract

In this study, highly efficient green-to-red-emitting CsPbBr3-zIz perovskite quantum dots (PQDs) with high color purity are synthesized and a facile route for the formation of PQD-inorganic SiO2 composites is proposed. To improve thermal and water stability of the PQDs, perhydropolysilazane (PHPS)-derived SiO2 composites are prepared. The CsPbBr3-SiO2 composites exhibit highly enhanced thermal stability and water stability. The green-emitting CsPbBr3-SiO2 composites and red-emitting CsPbBr1·2I1.8 PQDs are coated on blue light-emitting diodes (LEDs) and the fabricated green and red LEDs show high color purities of 95.1 and 99.5%, respectively. Finally, the white LED is fabricated by combining a blue LED with CsPbBr3-SiO2 composites and CsPbBr1·2I1.8 PQDs. The fabricated white LED shows bright natural white light (luminous efficacy = 35.4 lmW−1, correlated color temperature = 5623 K) with excellent color reproducibility due to wide color gamut (127% National Television System Committee color space).

Original languageEnglish
Pages (from-to)246-252
Number of pages7
JournalDyes and Pigments
Volume149
DOIs
Publication statusPublished - 2018 Feb 1

Keywords

  • Perhydropolysilazane
  • Perovskite quantum dots
  • Silica composites
  • White light-emitting diodes
  • Wide color gamut

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Process Chemistry and Technology

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