Meeting High Stability and Efficiency in Hybrid Light-Emitting Diodes Based on SiO2/ZrO2 Coated CsPbBr3 Perovskite Nanocrystals

Yanyan Duan, Cintia Ezquerro, Elena Serrano, Elena Lalinde, Javier García-Martínez, Jesús R. Berenguer, Rubén D. Costa

Research output: Contribution to journalArticle

Abstract

Significant advances are realized in perovskite-converted hybrid light-emitting diodes (pc-HLEDs). However, long-living devices at high efficiencies still represent a major milestone with average stabilities of <200 h at ≈50 lm W−1 under low applied currents (<15 mA). Herein, a dual metal oxide-coated CsPbBr3@SiO2/ZrO2 composite is prepared in a one-pot synthesis through the kinetic control of the sol–gel reaction, followed by a gentle drying process in air. These hybrid nanoparticles show photoluminescence quantum yields of ≈65% that are stable under temperature, ambient, and irradiation stress scenarios. This is translated to pc-HLEDs with a near-unity conversion efficiency at any applied current, high efficiencies around 75 lm W−1, and one of the most remarkable stabilities of ≈200 and 700 h at 100 and 10 mA, respectively. In addition, the device degradation mechanism is thoughtfully rationalized comparing devices operating under ambient/inert conditions. As such, this work provides three milestones: i) a new room temperature one-pot protocol to realize the first SiO2/ZrO2 metal oxide coating that effectively protects the emitting perovskite nanoparticle core, ii) one of the most stable and efficient pc-HLEDs operating under ambient condition at any applied current, and iii) new insights for the degradation of pc-HLEDs.

Original languageEnglish
JournalAdvanced Functional Materials
DOIs
Publication statusAccepted/In press - 2020

Keywords

  • color downconverting coatings
  • hybrid light-emitting diodes
  • metal oxide
  • perovskite nanoparticles
  • silica/zirconia

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

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