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Multicolor and Warm White Emissions with a High Color Rendering Index in a Tb3+/Eu3+-Codoped Phosphor Ceramic Plate

1
Centro de Investigaciones en Óptica A.C., A.P. 1-948, León 37150, Mexico
2
Instituto de Física, “Ing. Luis Rivera Terrazas’’, Benemérita Universidad Autónoma de Puebla, Apartado Postal J-48, Puebla 72570, Mexico
*
Author to whom correspondence should be addressed.
Materials 2019, 12(14), 2240; https://doi.org/10.3390/ma12142240
Received: 12 April 2019 / Revised: 9 May 2019 / Accepted: 9 May 2019 / Published: 11 July 2019
(This article belongs to the Special Issue Photonic Materials and Devices)
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Abstract

A series of Tb3+/Eu3+-codoped phosphor ceramic plates with a high color rendering index (CRI) for a near-ultraviolet light emitting diode (LED) were fabricated. Color emission can be tuned from green to reddish as a function of Eu3+ concentration. By doping only 0.15 mol% of Eu3+ concentration, a comfortable warm white emission is promoted as a result of simultaneous emissions of Tb3+ and Eu3+ ions. A theoretical model is proposed to calculate the contributions of the emitted color of the donor (Tb3+) and acceptor (Eu3+) ions in terms of europium concentration. The energy transfer from Tb3+ to Eu3+ ions is corroborated by the luminescence spectra and decay time of Tb3+, with a maximum energy transfer efficiency of 76% for 28 mol% of Tb3+ and 14 mol% of Eu3+. Warm white LEDs were constructed using a 380 nm UV chip and showed a CRI of 82.5, which was one of highest values reported for Tb3+/Eu3+-codoped samples. Color-correlated temperature (CCT), color coordinate (CC), and luminous efficacy (LE) were utilized to know the potentials as a phosphor converter in solid-state lighting. View Full-Text
Keywords: Luminescence; Tb3+/Eu3+; white light; Luminous efficacy; high CRI; solid state lighting Luminescence; Tb3+/Eu3+; white light; Luminous efficacy; high CRI; solid state lighting
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Desirena, H.; Molina-González, J.; Meza, O.; Castillo, P.; Bujdud-Pérez, J. Multicolor and Warm White Emissions with a High Color Rendering Index in a Tb3+/Eu3+-Codoped Phosphor Ceramic Plate. Materials 2019, 12, 2240.

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