TY - JOUR
T1 - Preparation and luminescence properties of spherical Sr4Al14O25
T2 - Eu2+ phosphor particles by a liquid synthesis
AU - Lee, Jeong
AU - Choi, Sungho
AU - Nahm, Sahn
AU - Jung, Ha Kyun
PY - 2014/1/1
Y1 - 2014/1/1
N2 - A spherical Sr4Al14O25:Eu2+ phosphor for use in white-light-emitting diodes was synthesized using a liquid-state reaction with two precipitation stages. For the formation of phosphor from a precursor, the calcination temperature was 1,100°C. The particle morphology of the phosphor was changed by controlling the processing conditions. The synthesized phosphor particles were spherical with a narrow size-distribution and had mono-dispersity. Upon excitation at 395 nm, the phosphor exhibited an emission band centered at 497 nm, corresponding to the 4f65d→4f7 electronic transitions of Eu2+. The critical quenching-concentration of Eu2+ in the synthesized Sr4Al14O25:Eu2+ phosphor was 5 mol%. A phosphorconverted LED was fabricated by the combination of the optimized spherical phosphor and a near-UV 390 nm LED chip. When this pc-LED was operated under various forward-bias currents at room temperature, the pc-LED exhibited a bright blue-green emission band, and high color-stability against changes in input power. Accordingly, the prepared spherical phosphor appears to be an excellent candidate for white LED applications.
AB - A spherical Sr4Al14O25:Eu2+ phosphor for use in white-light-emitting diodes was synthesized using a liquid-state reaction with two precipitation stages. For the formation of phosphor from a precursor, the calcination temperature was 1,100°C. The particle morphology of the phosphor was changed by controlling the processing conditions. The synthesized phosphor particles were spherical with a narrow size-distribution and had mono-dispersity. Upon excitation at 395 nm, the phosphor exhibited an emission band centered at 497 nm, corresponding to the 4f65d→4f7 electronic transitions of Eu2+. The critical quenching-concentration of Eu2+ in the synthesized Sr4Al14O25:Eu2+ phosphor was 5 mol%. A phosphorconverted LED was fabricated by the combination of the optimized spherical phosphor and a near-UV 390 nm LED chip. When this pc-LED was operated under various forward-bias currents at room temperature, the pc-LED exhibited a bright blue-green emission band, and high color-stability against changes in input power. Accordingly, the prepared spherical phosphor appears to be an excellent candidate for white LED applications.
KW - Co-precipitation
KW - Shape control
KW - SrAlO:Eu
UR - http://www.scopus.com/inward/record.url?scp=84908539656&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84908539656&partnerID=8YFLogxK
U2 - 10.3740/MRSK.2014.24.7.351
DO - 10.3740/MRSK.2014.24.7.351
M3 - Article
AN - SCOPUS:84908539656
VL - 24
SP - 351
EP - 356
JO - Korean Journal of Materials Research
JF - Korean Journal of Materials Research
SN - 1225-0562
IS - 7
ER -