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- W2962802743 abstract "The structure of upconversion materials has an important influence on their photoelectric properties. Herein, we show that the quadrilateral-like structure of Yb/Er/ZnO micronanoparticles grew to regular hexagonal-like structure by increasing the reaction time from 6 to 24 h. Yb/Er/ZnO samples were prepared via a hydrothermal method with polyethylene glycol (PEG) as the dispersant. The structural evolution originated from the addition of PEG dispersant. The Yb/Er/ZnO particles with hexagonal-like structure had increased carrier concentration, carrier mobility rate, Hall coefficient, and resistivity. In addition, a silica shell coating on Yb/Er/ZnO micronanoparticles with hexagonal-like structure (Yb/Er/ZnO@SiO2) was achieved by the Stöber method and improved the electrical conductivity. The migration rate of Yb/Er/ZnO@SiO2 increased to 163.6 cm V s–1. The core–shell interactions decreased the band gap of Yb/Er/ZnO and the energy of defect transition in ZnO host, which significantly improved host sensitization. With increasing power density from 2.04 to 9.04 W/cm2, the intensity of the red upconversion emission was clearly enhanced. Power-dependent multicolor emission excitation was achieved, and the color changed from red to yellow and to green. Moreover, color-correlated temperature (CCT) values changed between the cool region and the warm CCT region, indicating that tricolor emission was controlled via adjusting the excitation power. The regular hexagonal-like structure of Yb/Er/ZnO@SiO2 can be potentially extended to optoelectronic device applications." @default.
- W2962802743 created "2019-07-30" @default.
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- W2962802743 date "2019-07-19" @default.
- W2962802743 modified "2023-10-18" @default.
- W2962802743 title "High Conductivity and Excitation-Power Sensitivity of Upconversion Emission in Silica Decoration of Regular Hexagonal Yb and Er Codoped ZnO Core–Shell Particles" @default.
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- W2962802743 doi "https://doi.org/10.1021/acssuschemeng.9b03194" @default.
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