Abstract
A new multicolor-emitting Tb3+-Eu3+ codoped KAlP2O7 (KAPO) phosphor was synthesized by solid-state reaction under the air atmosphere. The synthesis, morphology, luminescence properties, energy transfer mechanisms and thermal stability of the synthesized phosphor were systematically investigated. The codoped phosphor exhibited the characteristic emission of Eu3+ at 612 nm (5D0-7F2) and Tb3+ at 544 nm (5D4-7F5). Under ultraviolet (UV) excitation, KAPO: Tb3+, Eu3+ shows tunable emission from green-yellow to red with increasing of Eu3+ concentration due to efficient Tb3+-Eu3+ energy transfer. Based on the decay curves, the energy transfer from Tb3+ to Eu3+ was classified to be of dipole-dipole interaction resonant type with energy transfer efficiency of ~97%. The excellent luminescent properties and remarkable thermal stabilities suggested that KAPO: Tb3+, Eu3+ is a promising UV-converting material for the fields of lighting and displays.
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