White emitting Ca2Tb8(SiO4)6O2:Eu2+/Eu3+ phosphors: Photoluminescence and efficient energy transfer
Journal
Chemical Physics Letters
Journal Volume
660
Pages
164-168
Date Issued
2016
Author(s)
Abstract
Ca2Tb8(SiO4)6O2:Eu2+/Eu3+ phosphors were prepared via solid-state diffusion route in reducing ambience. The structural/elemental analyses indicate the formation of pure phase which accommodates both Eu2+/Eu3+ ions. The shift of Tb3+ excitation band from 238 to 295 nm and increase (1.3¡Ñ) in excitation intensity with Eu concentration in Ca2Tb8(SiO4)6O2:Eu2+/Eu3+ phosphor is explained on the basis of Tb3+ to Eu3+ energy transfer. Upon various UV excitations (238?380 nm), Ca2Tb8(SiO4)6O2:Eu2+/Eu3+ showed tunable color emission including warm white light. Moreover, the emission intensity only decreased 15% after increasing the temperature to 200 ¢XC, revealing that present phosphors can be suitable for UV-LEDs. ? 2016 Elsevier B.V.
Subjects
Energy transfer
Photoluminescence
Solid-state diffusion
XPS
SDGs
Type
journal article