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One‐pot synthesis of homogeneous CdSe x S 1− x alloyed quantum dots with tunable composition in a green N‐oleoylmorpholine solvent
Author(s) -
Wang Binbin,
Jiang Yang,
Liu Chao,
Lan Xinzheng,
Liu Xinmei,
Wang Wenjun,
Duan Hongyan,
Zhang Yugang,
Li Shanying,
Zhang Zhongping
Publication year - 2012
Publication title -
physica status solidi (a)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.532
H-Index - 104
eISSN - 1862-6319
pISSN - 1862-6300
DOI - 10.1002/pssa.201127552
Subject(s) - high resolution transmission electron microscopy , photoluminescence , materials science , ternary operation , quantum dot , analytical chemistry (journal) , full width at half maximum , band gap , quantum yield , absorption (acoustics) , zinc , absorption spectroscopy , absorption edge , transmission electron microscopy , fluorescence , chemistry , nanotechnology , organic chemistry , optoelectronics , optics , physics , computer science , metallurgy , composite material , programming language
Composition‐tunable ternary CdSe x S 1− x quantum dots (shortened form, CdSeS QDs) with different emission colors were prepared via a non‐injection, one‐pot approach in a green N‐oleoylmorpholine solvent for the first time, with air‐stable compounds cadmium oxide (CdO), selenium (Se) powder, and sulfur (S) powder as Cd, Se, and S sources, respectively. The synthesis of ternary alloyed CdSeS QDs with homogeneous composition were performed by mixing cadmium oleate solution obtained from the reaction between CdO and oleic acid, and the premixed solution containing Se and S in N‐oleoylmorpholine solvent. The resulting CdSe x S 1− x QDs were characterized through UV–visible absorption spectrophotometer and fluorescence spectrophotometer, and they exhibited well‐resolved absorption feature and dominant band‐edge emission with a moderate size distribution (the full width at half maximum (FWHM) was 30–50 nm). The maximum photoluminescent (PL) quantum yield (QY) was as high as 60%. The high‐resolution transmission electron microscopy (HRTEM) images and powder X‐ray diffraction (XRD) patterns suggested that the as‐prepared ternary QDs possessed high crystalline and a cubic zinc‐blende structure. In addition, the results indicated that the similar reactivity between S/N‐oleoylmorpholine and Se/N‐oleoylmorpholine is responsible for the homogeneous structure of the as‐obtained CdSeS alloyed QDs.The as‐prepared CdSe x S 1− x QDs exhibit sharp emission features and various colors.