Tuning the color purity of LaAlO3:Eu3+ red phosphor by the cross relaxation

Abstract:

Precisely adjusting the color purity of LaAlO3:Eu3+ red phosphor with 593 and 618 nm emissions is achieved in a strategy of suppressing transitions of high energy levels of Eu3+ ions through varying the doping concentration.As the doping concentration increases,the transitions from high levels 5D3,2,1 will be weakened,while those from 5D0 are enhanced up to a critical value with the aid of the cross relaxation.As a result,an increase of the color purity from 95.2% to 97.4% is obtained.It indicates that the ...