Technical Physics Letters
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- 2022
Study of luminescent characteristics of a composite two-layer ceramic converter based on LuGdAG:Ce solid solutions
Kravtsov A. A.1, Bedrakov D.P.1, Lapin V. A.1, Malyavin F.F.1, Tarala V.A.1, Devitsky O. V.
2
1North-Caucasian Federal University, Stavropol, Russia
2Federal Research Center Southern Scientific Center of the Russian Academy of Sciences, Rostov-on-Don, Russia
2Federal Research Center Southern Scientific Center of the Russian Academy of Sciences, Rostov-on-Don, Russia
Email: v2517@rambler.ru
This study investigates the luminescence properties of a two-layer composite ceramic converter consisting of LuAG:Ce (S1) and LuGdAG:Ce (S2) layers. The results reveal that reducing the total composite thickness from 2 to 0.2 mm significantly modifies key spectral parameters: the color rendering index (CRI) for the S1 side increases from 45 to 56, the correlated color temperature for the S2 side rises from 3267 to 4670 K, and the conversion efficiency peaks at a thickness of 0.6 mm. Internal quantum efficiency measurements yield values of 73 % for the LuAG:Ce layer and 69 % for the LuGdAG:Ce layer. These findings demonstrate that the proposed composite architecture successfully integrates high conversion efficiency with tunable color characteristics, offering a promising approach for advanced phosphor applications. Keywords: LuAG:Ce, ceramics, white LEDs, CRI, LuGdAG:Ce, luminescence.
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