Micro light-emitting diodes (μ-LEDs) coupled to color conversion phosphors are among the most promising technologies for future display and artificial light sources. However, current emitters suffer from excessively large particle sizes, preventing micron-scale processability, and/or low stability that hampers the device lifetime. Here, we demonstrate down-conversion μ-LED phosphors based on CsPbBr3 perovskite nanocrystals directly grown inside perfectly sealed mesoporous silica nanospheres (NSs). Key for this advancement is a high-throughput calcination procedure in the presence of K2CO3 as selective pore sealing agent, which simultaneously produces the CsPbBr3 nanocrystals, boosts their emission efficiency to >87%, and perfectly isolates them from the outer environment without causing inter-particle cross-linking or aggregation. This results in size-homogeneous, finely solution-dispersible, ultra-stable, and highly emissive CsPbBr3-SiO2 NSs that fit the technological requirements of photolithographic inks for highly uniform μ-LED color conversion patterns with pixels smaller than 20 μm.

He, M., Zhang, Q., Carulli, F., Erroi, A., Wei, W., Kong, L., et al. (2023). Ultra-stable, Solution-Processable CsPbBr3-SiO2 Nanospheres for Highly Efficient Color Conversion in Micro Light-Emitting Diodes. ACS ENERGY LETTERS, 8, 151-158 [10.1021/acsenergylett.2c02062].

Ultra-stable, Solution-Processable CsPbBr3-SiO2 Nanospheres for Highly Efficient Color Conversion in Micro Light-Emitting Diodes

Francesco Carulli;Andrea Erroi;Sergio Brovelli
;
2023

Abstract

Micro light-emitting diodes (μ-LEDs) coupled to color conversion phosphors are among the most promising technologies for future display and artificial light sources. However, current emitters suffer from excessively large particle sizes, preventing micron-scale processability, and/or low stability that hampers the device lifetime. Here, we demonstrate down-conversion μ-LED phosphors based on CsPbBr3 perovskite nanocrystals directly grown inside perfectly sealed mesoporous silica nanospheres (NSs). Key for this advancement is a high-throughput calcination procedure in the presence of K2CO3 as selective pore sealing agent, which simultaneously produces the CsPbBr3 nanocrystals, boosts their emission efficiency to >87%, and perfectly isolates them from the outer environment without causing inter-particle cross-linking or aggregation. This results in size-homogeneous, finely solution-dispersible, ultra-stable, and highly emissive CsPbBr3-SiO2 NSs that fit the technological requirements of photolithographic inks for highly uniform μ-LED color conversion patterns with pixels smaller than 20 μm.
Articolo in rivista - Articolo scientifico
light-emitting diodes, perovskite nanocrystals, downconversion, micro-LED
English
22-nov-2022
2023
8
151
158
open
He, M., Zhang, Q., Carulli, F., Erroi, A., Wei, W., Kong, L., et al. (2023). Ultra-stable, Solution-Processable CsPbBr3-SiO2 Nanospheres for Highly Efficient Color Conversion in Micro Light-Emitting Diodes. ACS ENERGY LETTERS, 8, 151-158 [10.1021/acsenergylett.2c02062].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/400892
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