Abstract
A novel green phosphor, Ca 10K(PO 4) 7:Eu 2+,Tb 3+,K +, is synthesized by high temperature solid-state reaction. The photoluminescence properties show that there is an efficient energy transfer from Eu 2+ to Tb 3+ where Eu 2+ ions exhibit a strong excitation band between 350 and 420 nm, matching well with the dominant emission band of (n)-UV (390–420 nm) LED, and Tb 3+ ions give an intense green emitting light. A green LED with CIE chromaticity coordinates ( x = 0.283, y = 0.383) were fabricated by coating the Ca 10K(PO 4) 7:Eu 2+,Tb 3+,K + phosphor onto (n)-UV chip emitting at 398 nm. These results demonstrate that Tb 3+ ion with low 4f–4f absorption efficiency in (n)-UV region can play a role of activator in narrow green emitting phosphor potentially useful in (n)-UV GaN-based LED through efficient energy feeding by allowed 4f–5d absorption of Eu 2+ with high oscillator strength.
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