Optical properties of Dy3+ -doped P2O5 - K2O−MgO/MgF2−Al2O3 glasses
摘要
Optical and fluorescence properties of Dy2O3-doped P2O5+K2O+MgO+Al2O3 and P2O5+K2O+MgO+MgF2+Al2O3 glasses have been investigated at room temperature. From the optical absorption measurements and using Judd–Ofelt (JO) theory, JO parameters have been obtained which are used to predict the radiative properties of 4F9/2 level of Dy3+ ion. A strong yellow (Y) and blue (B) emissions corresponding to 4F9/2→6H13/2 and 4F9/2→6H15/2 transitions of Dy3+ ions were observed in these glasses. A good correlation between the intensity ratio (Y/B) and Ω6/Ω2 was identified. The CIE colour coordinates were evaluated from the emission spectra to simulate white light emission from the title glasses. Fluorescence decay curves of the 4F9/2→6H13/2 transition have been measured and analysed. The product of σemxτexp reveals the possibility of using these glasses for yellow laser.