Pr3+/Ho3+ co-doped glass phosphors for application in warm white light-emitting diodes

Abstract Pr 3+ /Ho 3+ co-doped fluorozirconate glasses were prepared and their luminescence properties studied. Blue, green and red luminescence in the wavelength region of 470–750 nm were achieved in these glasses under 443 nm light-emitting diode (LED) excitation. The ratio of Pr 3+ –Ho 3+ was changed in order to determine the appropriate combination for realizing color-controlled white LEDs. The color temperature of the white light can be adjusted by changing the LED-excitation wavelength or the ratio of the Ho 3+ /Pr 3+ ions. Thus, Pr 3+ /Ho 3+ co-doped fluorozirconate glasses are potential materials for use in white LEDs.