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Influence of additional Eu coactivator on the luminescence properties of Tb3Al5O12:Ce, Eu |
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| Authors: | Mihail Nazarov Do Young Noh Jongrak Sohn Chulsoo Yoon |
| Affiliation: | aDepartment of Materials Science and Engineering, Gwangju Institute of Science and Technology, 1 Oryong-dong, Buk-gu, Gwangju 500-712, Republic of Korea bInstitute of Electronic Engineering and Industrial Technologies, Academy Sciences of Moldova, Republic of Moldova cSamsung Electro-Mechanics Co., Ltd., Metan 3-Dong, Yeogtong-Gu, Suwon, Republic of Korea |
| Abstract: | The luminescence properties of doubly activated terbium aluminium garnet samples were investigated in the present study. Commercial Tb3Al5O12:Ce3+ (TAG:Ce) shows the typical Ce3+ ion luminescence of the allowed Ce3+ d–f transition. Eu3+ co-doping, however, reveals interesting results. In TAG:Ce, Eu, both Ce3+ and Eu3+ luminescence was measured at different Ce and Eu activator concentrations. The Ce3+ ion can be used as a sensitizer in the TAG lattice that transfers its energy directly or via the Tb sublattice to the activator Eu3+. The energy-level diagram was proposed to explain the luminescence mechanism. Application of TAG:Ce, Eu with improved chromaticity coordinates CIE (Commission Internationale de l’Eclairage) and color rendering index (CRI) in light emitting diodes (LEDs) is demonstrated. |
| Keywords: | Phosphor Chemical synthesis Optical properties Luminescence |
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