Simultaneous enhancement of luminescence and stability of CsPbBr3 perovskite nanocrystals via formation of perhydropolysilazane-derived nanopatterned film
- Simultaneous enhancement of luminescence and stability of CsPbBr3 perovskite nanocrystals via formation of perhydropolysilazane-derived nanopatterned film
- 한준수; 장호성; 박슬기; 조지연; 조준희; 정다운; 남민우; 이한주; 조용재; 주병권; 고두현
- perovskite nanocrystals; photoluminescence; stability; nanopatterned film
- Issue Date
- Chemical engineering journal
- VOL 393-124767-8
- In this paper, we report the creation of robust and bright visible light-emitting perhydropolysilazane (PHPS)-derived nanopatterned CsPbBr3 perovskite nanocrystal (PNC)-SiO2 films. The CsPbBr3-SiO2 films exhibit improved stability against heat exhibiting 35.4% of the initial photoluminescence (PL) intensity after 160 °C heattreatment and improved stability against water showing 92.6% of the initial PL intensity even after 30 days’ water immersion. In addition, the introduction of nanocylinder and nanocone patterns to the PHPS-derived CsPbBr3-SiO2 film resulted in 3.71 and 4.62-fold PL enhancement compared with the planar counterpart. The time resolved PL analysis and finite-difference time domain calculations indicate that the improvement of optical performance of the nanopatterned CsPbBr3-SiO2 films could be attributed to the enhanced absorption and emission via Mie resonance excitation. When the nanopatterned CsPbBr3-SiO2 film was combined with a blue light-emitting diode (LED), some of the blue light from the LED was converted into green light with high light conversion efficiency (72.3%). Along with the improved stability, the enhanced luminescence of the nanopatterned CsPbBr3-SiO2 films further extends their applicability for use in display devices with wide color gamut.
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