Strong high-energy exciton electroluminescence from the light holes of polytypic quantum dots.

ABSTRACT: High-energy exciton emission could allow single-component multi-colour display or white light-emitting diodes. However, the thermal relaxation of high-energy excitons is much faster than the photon emission of them, making them non-emissive. Here, we report quantum dots with light hole-heavy hole splitting exhibiting strong high-energy exciton electroluminescence from high-lying light holes, opening a gate for high-performance multi-colour light sources. The high-energy electroluminescence can reach 44.5% of the band-edge heavy-hole exciton emission at an electron flux density Φ_e of 0.71 × 10¹⁹ s^-1 cm^-2 - 600 times lower than the photon flux density Φ_p (4.3 × 10²¹ s^-1 cm^-2) required for the similar rati

SUBMITTER: Wang X 

PROVIDER: S-EPMC11283451 | biostudies-literature | 2024 Jul

REPOSITORIES: biostudies-literature