title: High quantum-yield CdSexS1-x/ZnS core/shell quantum dots for warm white light-emitting diodes with good color rendering.
abstract: Composition-controllable ternary CdSe(x)S(1-x) quantum dots (QDs) with multiple emission colors were obtained via a hot-injection-like method at a relatively low injection temperature (230 ° C) in octadecene. Then highly fluorescent CdSe(x)S(1-x)/ZnS core/shell (CS) QDs were synthesized by a facile single-molecular precursor approach. The fluorescent quantum yield of the resulting green (λ(em) = 523 nm), yellow (λ(em) = 565 nm) and red (λ(em) = 621 nm) emission of CS QDs in toluene reached up to 85%, 55% and 39%, respectively. Moreover, a QDs white light-emitting diode (QDs-WLED) was fabricated by hybridizing green-, yellow- and red-emitting CdSe(x)S(1-x)/ZnS CS QDs/epoxy composites on a blue InGaN chip. The resulting four-band RYGB QDs-WLED showed good performance with CIE-1931 coordinates of (0.4137, 0.3955), an R(a) of 81, and a T(c) of 3360 K at 30 mA, which indicated the combination of multiple-color QDs with high fluorescence QYs in LEDs as a promising approach to obtain warm WLEDs with good color rendering.
authors.affiliation: School of Materials Science and Engineering, Hefei University of Technology, Hefei, Anhui 230009, People's Republic of China.
authors.forename: Hongyan
authors.initials: H
authors.lastname: Duan
authors.forename: Yang
authors.initials: Y
authors.lastname: Jiang
authors.forename: Yugang
authors.initials: Y
authors.lastname: Zhang
authors.forename: Dapeng
authors.initials: D
authors.lastname: Sun
authors.forename: Chao
authors.initials: C
authors.lastname: Liu
authors.forename: Jian
authors.initials: J
authors.lastname: Huang
authors.forename: Xinzheng
authors.initials: X
authors.lastname: Lan
authors.forename: Hongyang
authors.initials: H
authors.lastname: Zhou
authors.forename: Lei
authors.initials: L
authors.lastname: Chen
authors.forename: Honghai
authors.initials: H
authors.lastname: Zhong