Abstract
The photophysical properties of the Eu3+:bfa (1,1,1,-trifluoro-4-phenyl butane-2,4-dione), Eu3+:hfa (1,1,1,5,5,5-hexafluoro pentane-2,4-dione) and Eu3+:tta(1,1,1-trifluoro-4-tenoyl butane-2,4-dione) systems oriented in K2SO4 crystal matrices were studied. The luminescence data for these systems revealed them to be highly luminescent materials. Characteristic Eu3+ transitions were observed in their emission spectra, when excited at 330 nm for Eu3+:bfa, 318 nm for Eu3+:hfa, and 350nm for Eu3+:tta. Lifetimes for the 5D0→7F2 transition of the beautiful red luminescent hourglass inclusions of the following ionic pairs: Eu3+: β-diketonates Eu3+:bfa (λexc=330 nm, λem=612 nm), Eu3+:hfa (λexc=318 nm, λem=612 nm), and Eu3+:tta (λexc=350 nm, λem=612 nm) in K2SO4 crystal matrix at room temperature are 0.90, 0.86 and 0.85 ms, respectively.
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