One-pot synthesis of Ag-In-Ga-S nanocrystals embedded in a GaO matrix and enhancement of band-edge emission by Na doping

• Published in: Nanoscale advances Vol. 5; no. 24; pp. 757 - 766
• Main Authors: Tozawa, Makoto, Miyamae, Chie, Akiyoshi, Kazutaka, Kameyama, Tatsuya, Yamamoto, Takahisa, Motomura, Genichi, Fujisaki, Yoshihide, Uematsu, Taro, Kuwabata, Susumu, Torimoto, Tsukasa
• Format: Journal Article
• Published: 05.12.2023
• ISSN: 2516-0230
• DOI: 10.1039/d3na00755c

I-III-VI-based semiconductor quantum dots (QDs) have been intensively explored because of their unique controllable optoelectronic properties. Here we report one-pot synthesis of Na-doped Ag-In-Ga-S (AIGS) QDs incorporated in a Ga 2 O 3 matrix. The obtained QDs showed a sharp band-edge photoluminescence peak at 557 nm without a broad-defect site emission. The PL quantum yield (QY) of such QDs was 58%, being much higher than that of AIGS QDs without Na + doping, 29%. The obtained Na-doped AIGS/Ga 2 O 3 composite particles were used as an emitting layer of green QD light-emitted diodes. A sharp electroluminescence (EL) peak was observed at 563 nm, being similar to that in the PL spectrum of the QDs used. The external quantum efficiency of the device was 0.6%. Ag-In-Ga-S nanocrystals embedded in a Ga 2 O 3 matrix produced a narrow band-edge photoluminescence, the intensity being significantly enlarged by Na + doping, and they effectively served as an emitting layer in green quantum dot-light-emitting diodes.