A method to encapsulate phosphor via chemical vapor deposition

A phosphor and photobody technology, applied in gaseous chemical plating, metal material coating process, coating, etc., can solve unproven problems

Inactive Publication Date: 2006-06-21
OSRAM SYLVANIA INC
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  • Description
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Problems solved by technology

[0007] While many of these phosphors or phosphor composites show improvements i

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  • A method to encapsulate phosphor via chemical vapor deposition

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experiment example 1

[0019] CBAL and pyrohydrolyzed TMA-coated CBAL (cCBAL) samples were prepared and their emission spectra collected. The samples were then subjected to degradation testing as described above. The application of the pyrohydrolyzed TMA coating significantly improved the retention characteristics of the CBAL phosphor. Optical emission results for the original and degraded CBAL and cCBAL phosphors are provided in Table 1 below (compared to the standard BAM phosphor used for comparison). The term "TH" refers to samples degraded by exposure to high temperature and humidity; the term "X" refers to samples degraded by exposure to high-intensity xenon plasma and VUV photon flux; the term "THX" refers to Samples degraded by exposure to high temperature and humidity followed by exposure to high intensity xenon plasma and VUV photon flux. Measure the intensity of the blue-emitting PDP BAM phosphor relative to a standard.

[0020] Powder Plate Data

[0021] The degradation res...

Embodiment 2

[0023] Manganese-activated zinc silicate (Zn 2 SiO 4 : Mn) is a high-efficiency green light-emitting phosphor for plasma display panels. The phosphor is very stable during the PDP panel production process. Significant brightness deterioration and color shift were not observed after exposure to high temperature and high humidity. However, the phosphor brightness deteriorates significantly under ion bombardment and plasma VUV irradiation. In order to improve brightness retention, according to the method of the present invention, Zn is coated with aluminum hydroxide coating 2 SiO 4 : Mn phosphor (OSRAMSYLVANIA type 9310). To compare the effect of hydrolyzed TMA coatings under accelerated aging test conditions, phosphor powders were encapsulated at low (180°C) and high (430°C) reaction temperatures. Uncoated and coated phosphors were mixed with the paste and the binder burned off (BBO). Initial brightness (after BBO) and final brightness (after exposure to high intensity Xe...

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Abstract

Aluminum hydroxide compound coatings are applied to improve phosphors (60 ) retention properties. In particular, the retention of europium-excited, calcium-substituted barium hexaaluminate phosphors (60) after exposure to high-intensity VUV fluxes was significantly improved.

Description

[0001] Cross references to related applications [0002] This application claims the benefit of US Provisional Application Nos. 60 / 470,734 and 60 / 470,635, both filed May 15,2003. technical field [0003] The present invention relates to a method of encapsulation of phosphor particles for use in vacuum ultraviolet (VUV)-excitation devices. In particular, the present invention relates to methods of encapsulating phosphors to protect phosphor particles from moisture attack, VUV irradiation, and Xe plasma bombardment. Background of the invention [0004] Conventional plasma display panels and other vacuum ultraviolet (VUV)-excitation devices are filled with rare gases or mixtures of rare gases (helium, neon, argon, xenon, and krypton), and they are excited by high-voltage currents and VUV below 200nm wavelength emits ultraviolet radiation. This emitted VUV radiation is then used to excite various blue-, green- and red-emitting phosphors. These phosphors differ from those comm...

Claims

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Application Information

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IPC IPC(8): C23C16/30B32B33/00C23C16/40
Inventor 范振文周仲年G·A·马金W·F·伊德格顿
Owner OSRAM SYLVANIA INC
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