Highly luminescent water-soluble AgInS2/ZnS quantum dots-hydrogel composites for warm white LEDs

Ternary Ⅰ-Ⅲ-Ⅵ quantum dots (QDs) have become promising color-conversion materials for warm white light-emitting diodes (WLEDs) because of their broad emission, large stokes shift, high luminescence and low-toxicity. In this work, AgInS2/ZnS (AIS/ZnS) core/shell QDs were synthesized via a facile micr...

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Published inJournal of alloys and compounds Vol. 824; p. 153896
Main Authors Su, Danlu, Wang, Le, Li, Min, Mei, Shiliang, Wei, Xian, Dai, Hanqing, Hu, Zhe, Xie, Fengxian, Guo, Ruiqian
Format Journal Article
LanguageEnglish
Published Lausanne Elsevier B.V 25.05.2020
Elsevier BV
Subjects
AgInS2/ZnS
Chip formation
Color temperature
Color-conversion materials
Competitive materials
Conversion
Emission
Hydrogels
Light emitting diodes
Microwave-assisted
Polyacrylamide
Quantum dots
Toxicity
Tunable emission
Water chemistry
White LED
White light
Zinc sulfide
AgInS2/ZnS
Microwave-assisted
Quantum dots
Color-conversion materials
Tunable emission
White LED
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Summary:Ternary Ⅰ-Ⅲ-Ⅵ quantum dots (QDs) have become promising color-conversion materials for warm white light-emitting diodes (WLEDs) because of their broad emission, large stokes shift, high luminescence and low-toxicity. In this work, AgInS2/ZnS (AIS/ZnS) core/shell QDs were synthesized via a facile microwave-assisted aqueous method. The PL emission can be tuned from 540 to 622 nm by varying the Ag/In ratio and the maximum quantum yield can reach 58.27%. Flexible luminescent films were obtained by embedding AIS/ZnS QDs in polyacrylamide hydrogel, which were combined with blue InGaN chips to fabricate remote-type warm WLEDs. The as-prepared LEDs exhibit a relatively high color rendering index (CRI) of 87.5 and a correlated color temperature (CCT) of 3669 K, indicating that water-soluble AIS/ZnS QDs are competitive color-conversion materials for warm WLEDs. •High-quality AgInS2/ZnS quantum dots are synthesized via a facile microwave-assisted aqueous method.•Flexible luminescent films are obtained by embedding AgInS2/ZnS quantum dots in polyacrylamide hydrogel.•Water-soluble AgInS2/ZnS quantum dots-hydrogel composites are competitive color-conversion materials for warm-white LEDs.
ISSN:0925-8388
1873-4669
DOI:10.1016/j.jallcom.2020.153896