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A series of Tb 3+ /Eu 3+ -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 Eu 3+ concentration. By doping only 0.15 mol% of Eu 3+ concentration, a comfortable warm white emission is promoted as a result of simultaneous emissions of Tb 3+ and Eu 3+ ions. A theoretical model is proposed to calculate the contributions of the emitted color of the donor (Tb 3+ ) and acceptor (Eu 3+ ) ions in terms of europium concentration. The energy transfer from Tb 3+ to Eu 3+ ions is corroborated by the luminescence spectra and decay time of Tb 3+ , with a maximum energy transfer efficiency of 76% for 28 mol% of Tb 3+ and 14 mol% of Eu 3+ . 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 Tb 3+ /Eu 3+ -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.

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