A new emission band of Eu~(2+) and its efficient energy transfer to Mn~(2+) in Sr_2Mg_3P_4O_(15):Mn~(2+) , Eu~(2+)

摘要

Eu~(2+) singly and Eu~(2+), Mn~(2+)co-doped Sr_2Mg_3P_4O_15 exhibit not only the well known blue emission band of Eu~(2+) peaking at 448 nm but also a new band at 399 nm in violet. They are attributed to Eu~(2+) on different Sr~(2+)sites. The Eu~(2+) for the violet band can transfer energy to the red emitting Mn~(2+) more efficiently than Eu~(2+) for the blue band. The new Eu~(2+) band could enable Sr_2Mg_3P_4O_15:Mn~(2+), Eu~(2+)to be a promising phosphor for enriching the red component of white LEDs.