Journal
CHEMICAL ENGINEERING JOURNAL
Volume 393, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2020.124767
Keywords
Perovskite nanocrystals; Perhydropolysilazane; Nanopattern; Perovskite nanocrystal film
Categories
Funding
- National Research Foundation of Korea (NRF) - Korea government (MSIT) [NRF2018R1A2B5A03023239, NRF-2020R1A2C2005844]
- Future Key Technology Program [2E29250]
- Korea Institute of Science and Technology
- National Research Council of Science & Technology (NST), Republic of Korea [C030311] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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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 degrees 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.
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