Abstract
Blue emissive quantum dots are key materials in fabricating quantum-dot light-emitting diodes for display applications. Up to date, most of the previous blue emissive quantum dots are based on quantum dots with type-I core-shell structure. In this work, we report pure-blue emissive ZnSe/CdxZn1−xS/ZnS quantum dots with type-II core-shell structure, which show high photoluminescence quantum yield over 90%. The type-II structure was investigated by applying time-resolved photoluminescence and transient absorption measurements, illustrating the extended photoluminescence decay lifetime of ZnSe/CdxZn1−xS quantum dots as well as the transition of bleaching peak from the valence band of ZnSe to the conduction band of CdZnS. We further fabricated ZnSe/CdxZn1−xS/ZnS quantum dots based electroluminescence devices, achieving a maximum external quantum efficiency of 6.7% and a maximum luminance of 39,766 cd·m−2. (Figure presented.)
Original language | English |
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Pages (from-to) | 10476-10482 |
Number of pages | 7 |
Journal | Nano Research |
Volume | 17 |
Issue number | 12 |
DOIs | |
Publication status | Published - Dec 2024 |
Externally published | Yes |
Keywords
- blue emitter
- core shell
- display
- quantum dots
- type-II