Journal
NANOTECHNOLOGY
Volume 31, Issue 21, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/1361-6528/ab72b5
Keywords
hydroxy-terminated ZnO quantum dots; quantum confinement; band alignment; photoluminescence; defect-free
Funding
- EPSRC [EP/M024938/1, EP/K022237/1]
- EPSRC [EP/M024938/1, EP/K022237/1] Funding Source: UKRI
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This paper reports the production of strongly confined ligand-free, defect-free, hydroxy-terminated ZnO quantum dots with a mean diameter of 1.9 nm, by radio frequency atmospheric pressure microplasma. Systematic characterization is performed to understand the surface chemistry of ZnO quantum dots. Photoluminescence studies show strong confinement effect on emission with only ultraviolet (UV) emission without any defect-related visible emission. Emission is again tested after eighteen months and confirms the QDs long-term emission stability. The mechanism responsible for this UV emission is also discussed and originates from OH-related surface terminations.
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