کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5442399 | 1510761 | 2017 | 6 صفحه PDF | دانلود رایگان |
- Na2O-ZnO-P2O5-B2O3 glasses are optically activated with Tm3+/Dy3+ ions.
- Non-radiative resonant energy transfer takes place between Tm3+ and Dy3+ ions.
- Tunable luminescence from yellow to white can be achieved.
Tm3+/Dy3+ co-doped phosphate glasses for white light-emitting diodes were synthesized by a conventional melting-quenching method. A spectroscopic research based on optical, photoluminescence spectrum and decay time curves in Tm3+/Dy3+ co-doped phosphate glasses was carried out. The color of luminescence could be tuned by altering the concentrations of Tm3+ ions. Under UV light excitation, the CIE chromaticity coordinates (0.3471, 0.3374) and color correlate temperature (CCTÂ =Â 4866.21Â K) close to the standard white-light illumination (0.333, 0.333 and CCTÂ =Â 5454.12Â K) could be achieved in 0.4Â Tm3+/0.6 Dy3+ (mol %) co-doped glass sample. The decrease of the Dy3+ emission decay time in existence of Tm3+ ascertained that non-radiative energy transfer from Dy3+ to Tm3+ occurred. Moreover, the research of energy transfers between Dy3+ and Tm3+ based on the Inokuti-Hirayama model revealed that an electric quadrupole-quadrupole interaction might be the predominant mechanism participated in the energy transfer. This finding suggests that the as-prepared Tm3+/Dy3+ co-doped phosphate glasses may be promising candidate for white LEDs and other display devices.
Journal: Optical Materials - Volume 73, November 2017, Pages 535-540