Energy transfer based enhanced red emission intensity from (Eu3+, Tb3+):LFBCd optical glasses

Present paper reports on the red emission enhancement by means of an energy transfer process in Eu3+ co-doped with Tb3+ in LFBCd glasses. The structural and photoluminescence properties of these glasses have been carried out from the measurement of X-Ray diffraction, excitation and emission spectra and also from the red emission transition lifetime. The PL spectrum of Eu3+ doped LFBCd glass has revealed a bright red emission at 612 nm (5D0→7F2) with an excitation at 393 nm (7F0→5L6). With Tb3+ ion singly doped glass has shown a prominent green emission at 547 nm (5D4→7F5) with an excited at λexci=377 nm (7F6→5G6). LFBCd glasses having Eu3+(1 mol%) co-doped with Tb3+ ion (in 0.1, 0.5, 1 mol%) at an excitation of λexci=377 nm, have exhibited an energy transfer from Tb3+ to Eu3+ ions hence causing an enhancement in red emission from Eu3+. The mechanism involved in this energy transfer process from terbium to europium ions has been explained in terms of an energy level diagram and from lifetime profiles.