EFFECT OF EXCITATION LEVEL ON THE PHOTOLUMINESCENCE OF BARIUM THIOGALLATE ACTIVATED WITH EUROPIUM AND CERIUM IONSстатья
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Дата последнего поиска статьи во внешних источниках: 19 июля 2013 г.
Аннотация:The photoluminescence of barium thiogallates doped with Eu(2+), Ce(3+), and Eu(2+) + Ce(3+) ions is studied over a wide range of excitation levels (10(-3)-10(6) W/cm(2)). Introduction of 3 at.% Eu and 3 at.% Ce instead of 5 at.% Eu into a BaGa(2)S(4) matrix doubles the luminescence quantum yield of the phosphor. Doped BaGa(2)S(4) exhibits a high linearity in its luminescence intensity as a function of excitation level (a constant efficiency) up to 2.10(4) W/cm(2) for excitation pulse durations of 8 ns, which corresponds to cw pumping at a power density of about 5.10(2) W/cm(2) in terms of the concentration of excited ions. It is shown that using BaGa(2)S(4): Eu, Ce along with the "yellow" phosphor of a Nichia NS6L083 LED may increase its color rendering index from 0.64 to 0.80 with no reduction in its luminous efficiency.