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Novel Eu2+-activated thiogallate phosphors for white LED applications: structural and spectroscopic analysis.

ABSTRACT: Novel Eu2+-activated BaGa2SiS6 and Ba2Ga8SiS16 thiogallate phosphors were prepared by solid-state reaction route. The BaGa2SiS6:Eu2+ phosphor generated a green emission upon excitation at 405 nm, whereas the Ba2Ga8SiS16:xEu2+ phosphor could be tuned from cyan to green range with increasing Eu2+ concentration upon excitation at 365 nm. Additionally, the thermal luminescence properties of the thiogallate phosphors were investigated in the temperature range of 25 to 250 °C. A warm-white LED is fabricated using the combination of a 405 nm blue InGaN-based LED chip with the green-emitting BaGa2SiS6:0.01Eu2+ phosphor, and red-emitting Sr2Si5N8:Eu2+ commercial phosphor with the CRI value of ∼88 and the CCT of 4213 K.

SUBMITTER: Lee SP 

PROVIDER: S-EPMC9079137 | biostudies-literature | 2018 Mar

REPOSITORIES: biostudies-literature

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Novel Eu<sup>2+</sup>-activated thiogallate phosphors for white LED applications: structural and spectroscopic analysis.

Lee Szu-Ping SP   Chan Ting-Shan TS   Dutta Somrita S   Chen Teng-Ming TM  

RSC advances 20180327 21

Novel Eu<sup>2+</sup>-activated BaGa<sub>2</sub>SiS<sub>6</sub> and Ba<sub>2</sub>Ga<sub>8</sub>SiS<sub>16</sub> thiogallate phosphors were prepared by solid-state reaction route. The BaGa<sub>2</sub>SiS<sub>6</sub>:Eu<sup>2+</sup> phosphor generated a green emission upon excitation at 405 nm, whereas the Ba<sub>2</sub>Ga<sub>8</sub>SiS<sub>16</sub>:<i>x</i>Eu<sup>2+</sup> phosphor could be tuned from cyan to green range with increasing Eu<sup>2+</sup> concentration upon excitation at 365 nm. Ad  ...[more]

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