Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5398822 | Journal of Luminescence | 2015 | 5 Pages |
â¢The Eu3+ ion was located at an asymmetric cation environment.â¢The 5D0â7F2 exhibits intense and narrow-band red emission.â¢The FWHM of dominant emission peak was about 6.49 nm.â¢The emission intensity was about three times higher than Y2O3:Eu3+.â¢This phosphor was suitable for near-UV and blue light excitation.
A narrow high intensity red-emitting double-perovskite type phosphor SrLa1âxMgTaO6:xEu3+ was successfully synthesized by a solid-state reaction method. Under the excitation of the near UV and blue light, this phosphor exhibited intense red emission that can improve the color qualities of warm light-emitting diodes. Due to the Eu3+ ions being an intrinsically asymmetric cation environment, the dominant emission peak emitted from the transition 5D0â7F2 is extraordinarily stronger than that of 5D0â7F1, the ratio I0â2/I0â1 was about 8.67. And owing to the most Eu3+ ions locating at same crystal field environment, a full-width at half-maximum (FWHM) of this peak was very narrow (6.49Â nm) at room temperature. Energy transfer between Eu3+ ions were demonstrated from dipole-dipole interaction, and the critical distance was estimated to be 9.31Â Ã . When Eu3+ ions' concentration reaches 30%, the emission intensity was observed about three times higher than that of a commercial red phosphor Y2O3:Eu3+, and the Commission International de L'Eclairage chromaticity coordinates was calculated at (0.66, 0.33). All the results confirmed that SrLa(1âx)MgTaO6:xEu3+ phosphors might be promising for use in white LEDs.