Broadening emission band of Ba2B2O5: Dy3+ by codoping Ce3+ as sensitizer and its application to white LEDs

Abstract In order to achieve broad-band white emitting phosphor, Ce 3+ /Dy 3+ codoped Ba 2 B 2 O 5 were synthesized by a solid-state method, and the luminescence property and energy transfer were discussed in detail. Dy 3+ doped Ba 2 B 2 O 5 shows white emission, and the two narrow peaks which are assigned to the 4 F 9/2  →  6 H 15/2 and 4 F 9/2  →  6 H 13/2 transitions of Dy 3+ ions, respectively. When codoped Ce 3+ as sensitizer, the broad-band white emission can be obtained by the energy transfer from Ce 3+ to Dy 3+ ions in Ba 2 B 2 O 5 , and the mechanism is the dipole-dipole interaction. And the CIE coordinates can be tuned from (0.2501, 0.2323) to (0.3422, 0.3799) by increase Dy 3+ content. The emission peak blue-shift of Ce 3+ ions in Ba 2 B 2 O 5 :Ce 3+ , Dy 3+ was observed from the thermal spectra, and the mechanism was analyzed. A white light emitting diodes (LEDs) can be fabricated Ba 2 B 2 O 5 :Ce 3+ , Dy 3+ with 380 nm chip, and the results show that the phosphor may be a potential application in this field.