کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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1258485 | 971620 | 2014 | 5 صفحه PDF | دانلود رایگان |
A new aluminosilicate long-lasting phosphor with composition of NaAlSiO4:Eu2+,Ho3+ was synthesized and investigated. Under UV light excitation, the phosphor emitted yellow light corresponding to the characteristic emission of Eu2+ due to 5d-4f transition. Bright yellow phosphorescence sustaining for more than 30 min was observed after ceasing the excitation. The phosphorescence intensity decay obeyed a t−1 decay law, indicating a tunneling electron-hole recombination process in the phosphor. Four peaks appeared in the thermoluminescence curve and the ones at 322 and 370 K were thought to account for the long lasting phosphorescence at room temperature. The Ho3+ ion incorporated into the phosphor did not give any light but dramatically increased the intensities of both photoluminescence and phosphorescence via promoting defect levels in the phosphor.
Graphical AbstractThree-dimension (3D) TL spectra of NaAlSiO4: Eu2+, Ho3+ measured from room temperature to 650 K with a heating rate of 3K per secondFigure optionsDownload as PowerPoint slide
Journal: Journal of Rare Earths - Volume 32, Issue 9, September 2014, Pages 792–796