INFLUENCE OF REACTION TEMPERATURE ON OPTICAL ...

Những tiến bộ trong Quang học, Quang phổ và Ứng dụng VI ISSN 1859 - 4271Fig. 2. The TL integral glow-curve of annealed natural zircon at different temperature, the sample wasirradiated Beta source1.5 Gy/min for 1hour, heating rate 1 o C/s.InFig.3weshowthethermoluminescencespectraofroomtemperatureandannealedzirconsampleat600,800,1000,1200,and1400 0 C.Thesespectraexhibitabroadbandwithmaximumat380nmandagroupofpeaksabout387nm,418nm,544nm,584nm,475nm and575nm.theappearanceofnearUVemissionband380nmareducetohostcomponents.Theoriginsoftheseluminescencebandshavebeenpublishedsomewhere[8-10].near-UVbandoriginatedfromthecentres[AlO 4 /M + ] o ,whicharealwayspresentedintheSiO 2 componentoftheiradiatedzircon[8].Theemissionat387,418,544,and584nm areducetothe 5 D 3 - 7 F 6 , 5 D 3 - 7 F 4 , 5 D 4 - 7 F 5 and 5 D 4 -7 F 4 transitionsofTb 3+ ionsrespectively.Beside,twostronglyemissionat475nm and575nmarecontributedto 4 F 9/2 - 6 H 13/2 and 4 F 9/2 - 6 H 15/2 transitionsofDy 3+ ions,respectively.Fig. 3. The thermoluminescence spectra of annealed natural zircon at different temperature. Thesample was irradiated Beta source, dose rate 1.5 Gy/min for 1hour, heating rate519