High concentration of Bi3+ incorporated into RNbO4 : Eu3+ (R = La, Y, Gd) as red phosphors for white LED applications

作者：Park Tae Keun; Ahn Han Cheol; Mho Sun Ii^*

来源：Journal of the Korean Physical Society, 2008, 52(2): 431-434.

• rare earth niobates
• phosphor
• optical property
• luminescence

Ultraviolet light from nitride semiconductor LEDs is to be converted into white light with high color rendering, the phosphors should efficiently absorb the pump LED light. The absorption bands of YNbO4:Eu3+ and GdNbO4:Eu3+ are red-shifted with Bi3+ incorporation in the lattice. The excitation band maximum and the long-wavelength band edge of the YNbO4:Eu3+ red phosphor have been severely red-shifted at high Bi3+ contents. With 15 atom% of Bi3+ incorporation in the lattice, (Y0.80Bi0.15)NbO4:Eu3+, the absorption band edge shifts to 352 nm, which will efficiently absorb the LED pump-light in the long-wavelength UV region.

• 出版日期2008-2