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Full-Text Articles in Physics
Spectral Modulation Through Controlling Anions In Nanocaged Phosphors, Hongyu Bian, Yuxue Liu, Duanting Yan, Hancheng Zhu, Chunguang Liu, Changshan Xu, Yichun Liu, Hong Zhang, Xiao-Jun Wang
Spectral Modulation Through Controlling Anions In Nanocaged Phosphors, Hongyu Bian, Yuxue Liu, Duanting Yan, Hancheng Zhu, Chunguang Liu, Changshan Xu, Yichun Liu, Hong Zhang, Xiao-Jun Wang
Department of Physics and Astronomy Faculty Publications
A new approach has been proposed and validated to modulate the emission spectra of europium-doped 12CaO·7Al2O3 phosphors by tuning the nonradiative and radiative transition rates, realized by controlling the sort and amount of the encaged anions. A single wavelength at 255 nm can excite simultaneously Eu2+ and Eu3+ centres to yield blue and red emissions, respectively. The amount of the anions in the nanocages, like OH− and H−, can be controlled by heat treatment processes. The existence of encaged OH− accelerates the nonradiative process of the emission centres, while the presence …
Single-Phased White-Emitting 12cao·7al2o3:Ce3+, Dy3+ Phosphors With Suitable Electrical Conductivity For Field Emission Displays, Xiuling Liu, Yuxue Liu, Duanting Yan, Hancheng Zhu, Chunguang Liu, Changshan Xu, Yichun Liu, Xiao-Jun Wang
Single-Phased White-Emitting 12cao·7al2o3:Ce3+, Dy3+ Phosphors With Suitable Electrical Conductivity For Field Emission Displays, Xiuling Liu, Yuxue Liu, Duanting Yan, Hancheng Zhu, Chunguang Liu, Changshan Xu, Yichun Liu, Xiao-Jun Wang
Department of Physics and Astronomy Faculty Publications
A novel white-light-emitting phosphor, 12CaO·7Al2O3:Ce3+, Dy3+with H− encaging, was prepared by the solid-state reaction in H2 atmosphere. Upon excitation at 362 nm, the phosphor shows intense white-light emission that combines the blue and yellow emissions at 476 and 576 nm, assigned to the 4F9/2 → 6H15/2 and 4F9/2 → 6H13/2 transitions of Dy3+, respectively. A weak broad blue emission centered at 430 nm is also observed and attributed to the 5d–4f transitions of Ce3+. The photoluminescence intensity of …