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

[Display omitted] •Perovskite nanocrystal (PNC)-SiO2 nanopatterned films are facilely synthesized.•The PNC-SiO2 nanopatterned film show simultaneous stability and PL enhancement.•Red/gree/blue-colored images are displayed utilizing the PNC-SiO2 nanopatterend film.•The PNC-SiO2 nanopatterned film-con...

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Veröffentlicht in:Chemical engineering journal (Lausanne, Switzerland : 1996) Switzerland : 1996), 2020-08, Vol.393, p.124767, Article 124767
Hauptverfasser: Park, Shulgi, Cho, Junhee, Jeong, Dawoon, Jo, Jiyeon, Nam, Minwoo, Rhee, Hanju, Han, Joon Soo, Cho, Yong Jae, Ju, Byeong-Kwon, Ko, Doo-Hyun, Jang, Ho Seong
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Sprache:eng
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Zusammenfassung:[Display omitted] •Perovskite nanocrystal (PNC)-SiO2 nanopatterned films are facilely synthesized.•The PNC-SiO2 nanopatterned film show simultaneous stability and PL enhancement.•Red/gree/blue-colored images are displayed utilizing the PNC-SiO2 nanopatterend film.•The PNC-SiO2 nanopatterned film-converted LED shows high light conversion efficiency. 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 heat-treatment 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.
ISSN:1385-8947
1873-3212
DOI:10.1016/j.cej.2020.124767