Synthesis of widely emission-tunable Ag–Ga–S and its quaternary derivative quantum dots

• Published in: Chemical engineering journal (Lausanne, Switzerland : 1996) Switzerland : 1996), 2018-09, Vol.347, p.791-797
• Main Authors: Kim, Jong-Hoon, Kim, Bu-Yong, Jang, Eun-Pyo, Yoon, Suk-Young, Kim, Kyung-Hye, Do, Young Rag, Yang, Heesun
• Format: Article
• Language: English
• Subjects: Ag-based I–III–VI; Emission-tunable; Quantum dots; White QD-LEDs
• ISSN: 1385-8947; 1873-3212
• DOI: 10.1016/j.cej.2018.04.167

[Display omitted] •Ag–Ga–S and its derivative Zn–Ag–Ga–S and Ag–In–Ga–S QDs were synthesized.•Widely color-tuned emissions from blue to amber with high PL QYs of 58–69% were demonstrated.•Ag– In–Ga–S QDs were combined with a blue LED to produce bicolored white solid-state lighting devices. 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.