Improvement of green emission from Tb3+:GdOBr phosphors by Ce3+ codoping

Shi De Cheng; Chan Hin Kam; Yee Loy Lam; Kantisara Pita; Srinivasa Buddhudu

doi:10.1117/12.405392

24 October 2000 Improvement of green emission from Tb³⁺:GdOBr phosphors by Ce³⁺codoping

Shi De Cheng, Chan Hin Kam, Yee Loy Lam, Kantisara Pita, Srinivasa Buddhudu

Proceedings Volume 4227, Advanced Microelectronic Processing Techniques; (2000) https://doi.org/10.1117/12.405392
Event: International Symposium on Microelectronics and Assembly, 2000, Singapore, Singapore

Abstract

A strong green emission has been observed from Tb³⁺ doped GdOBr powder phosphors upon excitation with an UV- wavelength. TO such a bright green color display phosphor material, different amount of Ce³⁺ from 0.1 to 1 mol percent has been added to further improvise the green emission efficiency. It has ben found that 0.2 mol percent of Ce³⁺ is the optimum content which resulted in an enhancement in the green emission intensity by five or six times compared to that of the singly doped terbium phosphors. It has been noted that with the increment of Ce³⁺ concentration, green emission of Tb³⁺ could not increased due to the strengthening of Ce³⁺- Ce³⁺ ion interaction or the concentration quenching effect. The mechanism involved in the energy transfer between the Ce³⁺ and Tb³⁺ has been explained using the energy level diagram. Energy absorbed by the sensitized Ce³⁺ ions could be transferred to fluorescent Tb³⁺ ions by means of resonant energy transfer and this ins mainly due to dipole interaction.

Citation Download Citation

Shi De Cheng, Chan Hin Kam, Yee Loy Lam, Kantisara Pita, and Srinivasa Buddhudu "Improvement of green emission from Tb³⁺:GdOBr phosphors by Ce³⁺codoping", Proc. SPIE 4227, Advanced Microelectronic Processing Techniques, (24 October 2000); https://doi.org/10.1117/12.405392

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