Blue-emitting LaSi3N5:Ce3+ fine powder phosphor for UV-converting white light-emitting diodes

Suehiro, Takayuki; Hirosaki, Naoto; Rong-Jun Xie; Sato, Tsugio
August 2009
Applied Physics Letters;8/3/2009, Vol. 95 Issue 5, p051903
Academic Journal
We have synthesized the pure ternary nitride phosphor, LaSi3N5:Ce3+ from the multicomponent oxide system La2O3–CeO2–SiO2, by using the gas-reduction-nitridation method. Highly pure, single-phase LaSi3N5:Ce3+ powders possessing particle sizes of ∼0.4–0.6 μm were obtained with the processing temperature ≤1500 °C. The synthesized LaSi3N5:Ce3+ exhibits tunable blue broadband emission with the dominant wavelength of 464–475 nm and the external quantum efficiency of ∼34%–67% under excitation of 355–380 nm. A high thermal stability of LaSi3N5:Ce3+ compared to the existing La–Si–O–N hosts was demonstrated, indicating the promising applicability as a blue-emitting phosphor for UV-converting white light-emitting diodes.


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