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Eu3+, Pr3+, or Gd3+codoped Ce:YAG single crystals were grown by using the Czochralski method. The photoluminescence(PL) emission and excitation spectra and transmittance were measured and investigated. The additional red-emitting bands were observed in the PL emission spectra of Eu,Ce:YAG and Pr,Ce:YAG single crystals and the formation of noticeable peaks was studied with reference to the schematic energy level diagrams. A red-shifted phenomenon was observed in the PL emission spectrum of Gd,Ce:YAG. With codoped Eu3+, Pr3+, or Gd3+ions, warmer white light was achieved for the white light emitting diodes and the color rendering index became higher.
Eu3 +, Pr3 +, or Gd3 + codoped Ce: YAG single crystals were grown by using the Czochralski method. The photoluminescence (PL) emission and excitation spectra and transmittance were measured and investigated. The additional red-emitting bands were observed in the PL emission spectra of Eu, Ce: YAG and Pr, Ce: YAG single crystals and the formation of noticeable peaks was studied with reference to the schematic energy level diagrams. A red-shifted phenomenon was observed in the PL emission spectrum of Gd, Ce: YAG. With codoped Eu3 +, Pr3 +, or Gd3 + ions, warmer white light was achieved for the white light emitting diodes and the color rendering index became higher.