Synthesis of new green-emitting KBa1−xScSi3O9:Eu2+x phosphors for white LEDs

• Green-emitting KBa1−xScSi3O9:Eu2+x phosphors were synthesized by a solid-state reaction method.
• These phosphors show green emission centered at 521 nm under near-UV and blue light excitation.
• These phosphors show an excellent thermal stability on the temperature quenching effect.

New green-emitting KBa1−xScSi3O9:Eu2+x phosphors for white LEDs were synthesized by a conventional solid-state reaction method. The obtained KBa1−xScSi3O9:Eu2+x phosphors show the strong broad optical absorption band from UV to blue light region and exhibit broad green emission with a peak at 521 nm under excitation at 405 nm due to the allowed 4f65d1−4f7 transition of Eu2+. Optimization of Eu2+ concentration resulted in the highest green emission peak intensity was obtained at the composition of KBa0.94ScSi3O9:Eu2+0.06, and the relative emission intensity of this phosphor was 32% of that of a commercial YAG:Ce3+ phosphor.