Yellow ZnS-based phosphor, process of preparing the same and display device using the phosphor
AssigneeSamsung SDI Co., Ltd.
InventorsSanghyuk Lee, Kyuchan Park, Sanghoon Shin, Yongchan You, Joayoung Jeong
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Abstract
A yellow ZnS-based phosphor which has improved color coordinates and luminance for use in intermediate- and low-voltage display devices using improved activators and coactivators is a (ZnS: Mn, Cu) phosphor which has color coordinates (x, y) shifting to a yellow emission as the amount copper added as an activator is increased. The phosphor has enhanced luminance by adding a trivalent metal as a coactivator. Therefore, the (ZnS: Mn, Cu) phosphor can be advantageously utilized for various display applications including vacuum fluorescent displays (VFDs) and field emission displays (FEDs).
Claims16
A phosphor comprising a (ZnS:
- Mn, Cu) phosphor having color coordinates (x, y) within a triangular region defined by (0.46, 0.54), (0.46, 0.45) and (0.50, 0.45), corresponding to a yellow emission color, and using the Mn as a first activator and the Cu as a second activator, and further comprising a coactivator, wherein the coactivator is a trivalent metal and is one of aluminum (Al), dysprosium (Dy), erbium (Er). samarium (Sm), bismuth (Bi) and lanthanum (La).
A phosphor comprising a (ZnS:
- Mn, Cu) phosphor having color coordinates (x, y) within a triangular region defined by (0.46, 0.54), (0.46, 0.45) and (0.50, 0.45), corresponding to a yellow emission color, and using the Mn as a first activator and the Cu as a second activator, wherein the Cu is added as the second activator in an amount of 1×10−4 to 1×10− mol% per mole of ZnS.
A phosphor comprising a (ZnS:
- Mn, Cu) phosphor having color coordinates (x, y) within a triangular region defined by (0.46, 0.54), (0.46, 0.45) and (0.50, 0.45), corresponding to a yellow emission color, and using the Mn as a first activator and the Cu as a second activator, and further comprising a coactivator, wherein the coactivator is a trivalent metal and is added in an amount of 0.01 to 10 mol% per mole of ZnS.
A process of preparing a ZnS:
- Mn, Cu phosphor, comprising:
- blending a ZnS host material having Mn as a first activator and Cu as a second activator with water, and stirring to produce a mixture;
- drying and pulverizing the mixture to acquire fine particles;
- and
- sintering the fine particles at 800 to 1100° C. under a mild reducing atmosphere for 1 to 6 hours.
A display device comprising:
- a vacuum envelope within a container;
- and
- an electron source and a phosphor layer disposed in the vacuum envelope,
- wherein the phosphor layer includes a phosphor into which electrons emitted from the electron source collide to emit light, the phosphor being a ZnS:
- Mn, Cu phosphor having color coordinates (x, y) within a triangular region defined by (0.46, 0.54), (0.46, 0.45) and (0.55, 0.45), corresponding to a yellow emission color, and using Mn as a first activator and Cu as a second activator,
- wherein the ZnS:
- Mn, Cu phosphor further uses a trivalent metal as a coactivator.
A phosphor comprising a (ZnS:
- Mn, Cu) phosphor with a yellow emission color using the Mn as a first activator and the Cu as a second activator, and further comprising a trivalent metal as a coactivator.
Dependencies are inferred from the claim text.