Simultaneous enhancement of luminescence and stability of CsPbBr3 perovskite nanocrystals via formation of perhydropolysilazane-derived nanopatterned film

Title
Simultaneous enhancement of luminescence and stability of CsPbBr3 perovskite nanocrystals via formation of perhydropolysilazane-derived nanopatterned film
Authors
한준수장호성박슬기조지연조준희정다운남민우이한주조용재주병권고두현
Keywords
perovskite nanocrystals; photoluminescence; stability; nanopatterned film
Issue Date
2020-08
Publisher
Chemical engineering journal
Citation
VOL 393-124767-8
Abstract
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.
URI
http://pubs.kist.re.kr/handle/201004/71192
ISSN
1385-8947
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KIST Publication > Article
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