In this study, highly efficient green-to-red-emitting CsPbBr3-zIz perovskite quantum dots (PQDs) with high color purity are synthesized and a facile route for the formation of PQD-inorganic SiO2 composites is proposed. To improve thermal and water stability of the PQDs, perhydropolysilazane (PHPS)-derived SiO2 composites are prepared. The CsPbBr3-SiO2 composites exhibit highly enhanced thermal stability and water stability. The green-emitting CsPbBr3-SiO2 composites and red-emitting CsPbBr1·2I1.8 PQDs are coated on blue light-emitting diodes (LEDs) and the fabricated green and red LEDs show high color purities of 95.1 and 99.5%, respectively. Finally, the white LED is fabricated by combining a blue LED with CsPbBr3-SiO2 composites and CsPbBr1·2I1.8 PQDs. The fabricated white LED shows bright natural white light (luminous efficacy = 35.4 lmW−1, correlated color temperature = 5623 K) with excellent color reproducibility due to wide color gamut (127% National Television System Committee color space).
Bibliographical noteFunding Information:
This research was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIP) ( NRF-2016R1A2B2013629 ) and Future Key Technology Program (project No. 2E26960 ) by Korea Institute of Science and Technology . We thank Dr. Gumin Kang for technical help for lifetime measurement.
© 2017 Elsevier Ltd
- Perovskite quantum dots
- Silica composites
- White light-emitting diodes
- Wide color gamut
ASJC Scopus subject areas
- Chemical Engineering(all)
- Process Chemistry and Technology