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

Publication date: 1 September 2018
Source:Chemical Engineering Journal, Volume 347
Author(s): Jong-Hoon Kim, Bu-Yong Kim, Eun-Pyo Jang, Suk-Young Yoon, Kyung-Hye Kim, Young Rag Do, Heesun Yang
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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