Hybrid light emitting diodes based on stable, high brightness all-inorganic CsPbI 3 perovskite nanocrystals and InGaN
Zhang, Chengxi; Turyanska, Lyudmila; Cao, Haicheng; Zhao, Lixia; Fay, Michael W.; Temperton, Robert; O'Shea, James; Thomas, Neil R.; Wang, Kaiyou; Luan, Weiling; Patanè, Amalia
Dr MICHAEL FAY MICHAEL.FAY@NOTTINGHAM.AC.UK
Senior Research Fellow
Neil R. Thomas
Despite important advances in the synthesis of inorganic perovskite nanocrystals (NCs), the long-term instability and degradation of their quantum yield (QY) over time need to be addressed to enable the further development and exploitation of these nanomaterials. Here we report on stable CsPbI3 perovskite NCs and their use in hybrid light emitting diodes (LEDs), which combine in one system the NCs and a blue GaN-based LED. Nanocrystals with improved morphological and optical properties are obtained by optimizing the post-synthesis replacement of oleic acid ligands with iminodibenzoic acid: the NCs have a long shell-life (> 2 months), stability under different environmental conditions, and a high QY, of up to 90%, in the visible spectral range. Ligand replacement enables the engineering of the morphological and optical properties of the NCs. Furthermore, the NCs can be used to coat the surface of a GaN-LED to realize a stable diode where they are excited by blue light from the LED under low current injection conditions, resulting into emissions at distinct wavelengths in the visible range. The high QY and fluorescence lifetime in the nanosecond range are key parameters for visible light communication, an emerging technology that requires high-performance visible light sources for secure, fast energy-efficient wireless transmission.
|Journal Article Type||Article|
|Publication Date||Jul 28, 2019|
|Publisher||Royal Society of Chemistry|
|Peer Reviewed||Peer Reviewed|
|APA6 Citation||Zhang, C., Turyanska, L., Cao, H., Zhao, L., Fay, M. W., Temperton, R., …Patanè, A. (2019). Hybrid light emitting diodes based on stable, high brightness all-inorganic CsPbI 3 perovskite nanocrystals and InGaN. Nanoscale, 11(28), 13450-13457. doi:10.1039/C9NR03707A|
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