Thursday, May 2025

05:00 PM - 08:00 PM

Room: 220A

Session: Emissive, Micro-LED, and Quantum-Dot Displays Posters

Oxide Encapsulation of CsPbBr3 Nanocrystals to Enhance the Optical Efficiency and PLQY for LEDs Through Transition Dipole Alignments

Student

Description:

The quantum efficiency of Perovskite LEDs has been limited due to degradation of the QD’s over time when exposed to air and water because of substrate interactions. Encapsulation of nanocrystals with an oxide layer will improve stability and retain higher efficiencies as oxides don’t react with O2 or H2O. Oxide encapsulation enhances the light extraction from the LED by orienting the light emissions to the in-escape cone region by limiting the total internal reflection in the active layer. Silica encapsulated CsPBbr3 particles are less susceptible to degradation and have retained 76.8% of the PL intensity when exposed to light and moisture for 2 weeks whereas the CsPbBr3 particles retain 34% of initial luminescence. The transition dipole moment angle (TDM) measured for the CsPbBr3@SiO2 was around 32o (close to random) indicating that encapsulation of CsPbBr3 with oxides tends towards anisotropic emissions thus enabling more light extraction from LEDs.