Tb~(3+)-Doped Zinc Phthalate Phosphor

The Tb3+-doped zinc phthalate (Znpht:Tb) phosphor was prepared by the solid phase reaction of zinc oxide and phthalic anhydride in the saturated water vapor at 80-100℃. The crystal structure, emission and excitation spectra were determined. The dependence of the fluorescent spectrum properties on the Tb3+ ion concentration was investigated. The energy transfer mechanism from π, π* and n, π* excited states of Pht2- radical to 5D4 energy level of Tb3+ ion was revealed. (1)S1(π,π*, n, π*) → (5Hj,5 Lj) →5D3, → T1(π, π*, n,π*) →5H4; (2) S1(π,π*, n,π*) → T1(π,π*,n, π*) ─5H4.