Synthesis of widely emission-tunable Ag-Ga-S and its quaternary derivative quantum dots
- Authors
- Kim, Jong-Hoon; Kim, Bu-Yong; Jang, Eun-Pyo; Yoon, Suk-Young; Kim, Kyung-Hye; Do, Young Rag; Yang, Heesun
- Issue Date
- 1-Sep-2018
- Publisher
- ELSEVIER SCIENCE SA
- Keywords
- Ag-based I-III-VI; Quantum dots; Emission-tunable; White QD-LEDs
- Citation
- CHEMICAL ENGINEERING JOURNAL, v.347, pp.791 - 797
- Journal Title
- CHEMICAL ENGINEERING JOURNAL
- Volume
- 347
- Start Page
- 791
- End Page
- 797
- URI
- https://scholarworks.bwise.kr/hongik/handle/2020.sw.hongik/3252
- DOI
- 10.1016/j.cej.2018.04.167
- ISSN
- 1385-8947
- Abstract
- Chalcopyrite I -III-VI chalcogenides have attracted great attention as environmentally benign, non-Cd compositions for synthesis of colloidal quantum dot (QD) emitters. Various Cu-based I-III-VI compositions have been intensively investigated for synthesis of highly fluorescent QDs, while the compositional diversity of Ag-based QD emitters remains still limited. Here, we explore synthesis of Ag-based I-III-VI QDs of ternary Ag-Ga-S (AGS) and its derivative quaternary Zn-Ag-Ga-S (ZAGS) and Ag-In-Ga-S (AIGS) QDs through alloying AGS with Zn2+ and In3+ ions, respectively. Being in line with the variation of band gap of a series of these QDs, they exhibit a systematic, wide photoluminescence (PL) tunability from blue (450 nm, the shortest PL wavelength reported to date from I-III-VI QD emitters) from the highest-band gap ZAGS to amber color (570 nm) from the lowest-band gap AIGS with high PL quantum yields of 58-69% after elaborate ZnS shelling. Among QDs above, two AIGS/ZnS QDs with different In contents, which are capable of efficiently absorbing blue photons, are further applied as down-converters in combination with a blue light-emitting diode (LED) to produce bicolored white solid-state lighting devices and down-conversion emission properties of the resulting white QD-LEDs are described in detail.
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Collections - Graduate School > Materials Science and Engineering > 1. Journal Articles
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