The broad emission at 785 nm in YAG:Ce3+,Cr3+ phosphor
| Autor: | Bing Wu, Yu Pang, Sha Jiang, Xiaobing Luo, Li Li, Xianju Zhou, Xiaoxia Luo |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Diffraction
Chemistry Analytical chemistry Phosphor 02 engineering and technology Crystal structure 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Atomic and Molecular Physics and Optics 0104 chemical sciences Analytical Chemistry X-ray photoelectron spectroscopy Impurity Phase (matter) 0210 nano-technology Luminescence Instrumentation Inductively coupled plasma mass spectrometry Spectroscopy |
| Zdroj: | Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy. 190:76-80 |
| ISSN: | 1386-1425 |
| Popis: | Luminescence of defects and/or impurities is important for phosphors. One broad emission band centered at 785nm was observed in (Y0.97Ce0.03)3(Al1-xCrx)5O12 (x=0.005, 0.01, 0.03, 0.06, 0.09), (YAG:Ce,Cr) nano-particles synthesized by polymer-assisted sol-gel method in this work. In order to study the source of this wide emission band, the crystalline phase structure of the phosphors was examined by X-ray diffraction (XRD). No obvious diffraction peaks due to impurity phase were observed even though the calcining temperature of the samples arrived at 1400°C. The anti-site defects were excluded. No detectable signals of impurities were obtained by X-ray Photoelectron Spectroscopy (XPS) or inductively coupled plasma mass spectrometry (ICP-MS). Based on the photo-luminescence results of YAG:Ce,Cr, YAG:Ce and YAG:Fe phosphors, the wide emission band is attributed to the 4T1(4G)→6A1(6S) transition from the trace impurity of Fe3+. The excitation band at 280nm is assigned to Fe3+-O2- charge transfer band. |
| Databáze: | OpenAIRE |
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