Blue phosphor, light-emitting device, and plasma display panel

Details Blue phosphor, light-emitting device, and plasma display panel Blue phosphor, light-emitting device, and plasma display panel

2008-03-25

2011-10-18

Williams, Joseph L (Department: 2889)

Electric lamp and discharge devices

With gas or vapor

Three or more electrode discharge device

C313S486000, C313S503000, C252S30140R, C252S301500

Reexamination Certificate

active

08040063

ABSTRACT:
The present invention provides a blue phosphor that exhibits high luminance and shows less luminance degradation during driving of a light-emitting device. The present invention is a blue phosphor represented by the general formula aBaO.bSrO.(1−a−b)EuO.cMgO.dAlO3/2.eWO3, where 0.70≦a≦0.95, 0≦b≦0.15, 0.95≦c≦1.15, 9.00≦d≦11.00, 0.001≦e≦0.100, and a+b≦0.97 are satisfied. In this blue phosphor, two peaks whose tops are located in a range of diffraction angle 2θ=13.0 to 13.6 degrees are present in an X-ray diffraction pattern obtained by measurement on the blue phosphor using an X-ray with a wavelength of 0.774 Å.

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Co-pending U.S. Appl. No. 12/595,159, filed Oct. 9, 2009.
Ryu, et al., “Blue-Luminescence of Nanocrystalline MWO4(M = Ca, Sr, Ba, Pb) Phosphors Synthesized via a Citrate Complex Route Assisted by Microwave Irradiation”, Electrochemical and Solid-State Letters, vol. 8, No. 5, 2005, pp. DI5-D18.

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