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- Title
The application of Ca<sub>5</sub>B<sub>2</sub>SiO<sub>10</sub>:Eu<sup>3+</sup> and YAl<sub>3</sub>B<sub>4</sub>O<sub>12</sub>:Ce<sup>3+</sup>,Mn<sup>2+</sup> in dual-layer remote phosphor to enhance lumen output and color quality of WLEDs.
- Authors
Phan Xuan Le; Le Hung Tien
- Abstract
This study proposes a dual-layer remote phosphor structure, comprised of a green or a red phosphor layer and a yellow YAG:Ce3+ phosphor layer, to enhance color rendering index (CRI) and color quality scale (CQS) of white light-emitting diodes (WLEDs). The phosphors used in this study are green phosphor YAl3B4O12:Ce3+,Mn2+ and red phosphor Ca5B2SiO10:Eu3+. Besides, the applied WLED structure has the color temperature of 8500 K. The study demonstrates the idea of placing a green phosphor YAl3B4O12:Ce3+,Mn2+ or a red Ca5B2SiO10:Eu3+ phosphor layer on the yellow phosphor YAG:Ce3+ one. After that, the suitable concentration of Ca5B2SiO10:Eu3+ resulting in the highest color quality is determined. The obtained results showed that Ca5B2SiO10:Eu3+ is advantageous to CRI and CQS. Particularly, the values of CRI and CQS increased following the growth of Ca5B2SiO10:Eu3+ concentration, due to the rise in red light components inside WLED's packages. Meanwhile, the luminous flux is benefited by the added green Ca5B2SiO10:Eu3+ phosphor. However, there are decreases in lumen output and color quality when the concentrations of Ca5B2SiO10:Eu3+ and YAl3B4O12:Ce3+,Mn2+ rise over the corresponding levels. This result is proved via using Mie-scattering theory and Lambert-Beer's law. In short, the findings of the research paper are valuable references for high-light-quality WLEDs fabrication.
- Subjects
PHOSPHORS; BEER-Lambert law; LUMINOUS flux; LIGHT emitting diodes; COLOR temperature
- Publication
Telkomnika, 2021, Vol 19, Issue 5, p1665
- ISSN
1693-6930
- Publication type
Article
- DOI
10.12928/TELKOMNIKA.v19i5.15024