Journal
NANOTECHNOLOGY
Volume 28, Issue 43, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/1361-6528/aa878c
Keywords
quantum dots; photoluminescence; color conversion layer
Funding
- National Natural Science Foundation of China [11374013, 11404001, 1608085, 51541111, 51272246]
- Outstanding young talent fund of Anhui Province [J05201424]
- Research Fund for the Doctoral Program of Higher Education of China [20133401110002]
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The work reports the fabrication of Cu doped Zn-In-S (CZIS) alloy quantum dots (QDs) using dodecanethiol and oleic acid as stabilizing ligands. With the increase of doped Cu element, the photoluminescence (PL) peak is monotonically red shifted. After coating ZnS shell, the PL quantum yield of CZIS QDs can reach 78%. Using reverse micelle microemulsion method, CZIS/ZnS QDs@SiO2 multi-core nanospheres were synthesized to improve the colloidal stability and avoid the aggregation of QDs. The obtained multi-core nanospheres were dispersed in curing adhesive, and applied as a color conversion layer in down converted light-emitting diodes. After encapsulation in curing adhesive, the newly designed LEDs show artifically regulated color coordinates with varying the weight ratio of green QDs and red QDs, and the concentrations of these two types of QDs. Moreover, natural white and warm white LEDs with correlated color temperature of 5287, 6732, 2731, and 3309 K can be achieved, which indicates that CZIS/ZnS QDs@SiO2 nanostructures are promising color conversion layer material for solid-state lighting application.
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