A single-composition CaSi{sub 2}O{sub 2}N{sub 2}:RE (RE=Ce{sup 3+}/Tb{sup 3+}, Eu{sup 2+}, Mn{sup 2+}) phosphor nanofiber mat: Energy transfer, luminescence and tunable color properties
- State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Materials, Donghua University, Shanghai 201620 (China)
- Engineering Research Center of Advanced Glasses Manufacturing Technology, MOE, Donghua University, Shanghai 201620 (China)
CaSi{sub 2}O{sub 2}N{sub 2}:RE (RE = Ce{sup 3+}/Tb{sup 3+}, Eu{sup 2+}, Mn{sup 2+}) phosphor nanofiber mat has been prepared via the electrospinning process and further annealing treatment. The diameter of nanofiber precursors are generally in a range of 400–600 nm, which exhibits smooth and uniform surface morphology. After removing the polymer template by high temperature treatment, the fabricated mats have been transformed into a phosphor film and maintain uniform nanofiber network microstructures. Photoluminescence (PL) properties of CaSi{sub 2}O{sub 2}N{sub 2} phosphor nanofiber mat have been activated by Ce{sup 3+}/Tb{sup 3+}, Eu{sup 2+} and Mn{sup 2+}. The emission color of CaSi{sub 2}O{sub 2}N{sub 2}:Ce{sup 3+}/Tb{sup 3+}, Eu{sup 2+}, Mn{sup 2+} phosphor mats can be adjusted by modifying the concentration of doped Tb{sup 3+}/Mn{sup 2+}/Eu{sup 2+} and the resultant energy transfer process. Owing to the energy transfer of Ce{sup 3+}-Tb{sup 3+}, the emitting color of the phosphor mat can be changed from blue to green. Meanwhile, we still found that the switching of emitting colors from blue to red and blue to yellow can be achieved via the energy transfer of Ce{sup 3+}-Mn{sup 2+} and Ce{sup 3+}-Eu{sup 2+}, respectively. We demonstrated a white light emission phosphor nanofiber mat by using CaSi{sub 2}O{sub 2}N{sub 2} system, which exhibited promising applications for near-UV WLEDs. - Graphical abstract: CIE chromaticity coordinates of CaSi{sub 2}O{sub 2}N{sub 2}:Ce{sup 3+}/Tb{sup 3+}, Eu{sup 2+}, Mn{sup 2+} samples. The lighting optical images with a drive current of 100 mA: three LEDs with nanofiber mats of CaSi{sub 2}O{sub 2}N{sub 2}: 0.02Ce{sup 3+}, 0.03Tb{sup 3+}(b), CaSi{sub 2}O{sub 2}N{sub 2}: 0.02Ce{sup 3+}, 0.01Eu{sup 2+}(c) and CaSi{sub 2}O{sub 2}N{sub 2}: 0.02Ce{sup 3+}, 0.12Mn{sup 2+}(d). Display Omitted.
- OSTI ID:
- 22742034
- Journal Information:
- Journal of Solid State Chemistry, Vol. 253; Other Information: Copyright (c) 2017 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); ISSN 0022-4596
- Country of Publication:
- United States
- Language:
- English
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