White-light emitting device, and phosphor and method of its manufacture

A technology of emission device and manufacturing method, which is applied in the field of white light emission device, can solve the problems of low emission efficiency, low emission efficiency of white light, etc., and achieve the effect of high efficiency

Inactive Publication Date: 2005-03-09
SUMITOMO ELECTRIC IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But one obstacle is that since the emission efficiency of ultraviolet LED is lower than that of blue LED, the emission efficiency of white light will be lower as a result.

Method used

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  • White-light emitting device, and phosphor and method of its manufacture
  • White-light emitting device, and phosphor and method of its manufacture
  • White-light emitting device, and phosphor and method of its manufacture

Examples

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no. 1 example

[0078] Figure 9 A white-light emitting device as described in was fabricated. First, ZnSSe crystals were grown using the iodine transport method and heat-treated at 1000 °C in an environment in which Zn and Cu vapors were mixed, thereby preparing a predetermined composite (ZnS atomic fraction 0.6) ZnS 0.6 Se 0.4 crystals. This phosphor corresponds to the diamond-shaped mark near the atomic percent of 0.6 of ZnS at a wavelength of 570 nm on the chromaticity diagram, and is a yellow-emitting phosphor. 250 µm thick ZnSSe plate from ZnS 0.6 Se 0.4 Cut out. Both sides of the ZnSSe plate were polished to a mirror-like shape, so that the thickness was reduced to 200 μm, and the polished plate was cut into 3 mm squares to produce ZnS 0.6 Se 0.4 Phosphor plate.

[0079] In addition, a blue LED chip with an emission wavelength of 450nm and an active layer of InGaN was prepared. Ag paste was used to bond the LED chip to the chip die (lead frame mounting part)9, as Figure 9 sh...

no. 2 example

[0081] Figure 10 A white-light emitting device as described in was fabricated. 250 µm thick ZnSSe plate from ZnS 0.6 Se 0.4 crystal (ZnS atomic percent 0.6) cut out, the ZnS 0.6 Se 0.4 Crystals were first grown using the iodine transport method, and then heat-treated in a 1000° C. environment in which Zn and Ag vapors were mixed. This phosphor is marked by a black dot with a ZnS atomic fraction of 0.6 on the chromaticity diagram and is a green-emitting phosphor. Both sides of the ZnSSe plate were polished to a mirror-like finish so that the thickness was reduced to 200 μm, and the polished plate was cut into 3 mm squares to produce a ZnSSe phosphor plate (green phosphor: first phosphor).

[0082] In addition, 400 micron square, 250 micron thick ZnS 0.25 Se 0.75 Phosphor plate (red phosphor: second phosphor) from ZnS 0.25 Se 0.75 Crystal (ZnS atomic percentage 0.25) preparation, the ZnS 0.25 Se 0.75 Crystals were grown using the iodine transport method and heat trea...

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Abstract

White-light emitting device that excels in emission efficiency and temperature stability and that can put out white light of a color temperature of choice is afforded by utilizing phosphors of superior temperature characteristics and high light-emitting efficiency; the phosphors and a method of manufacturing the phosphors are also made available. An LED (1), and a phosphor (3) ZnSx,Se1-x(0 < x < 1) that contains at least one activator among Cu, Ag and Au and that, excited by light irradiated from the LED, produces light are furnished.

Description

technical field [0001] The present invention relates to a white light emitting device, a phosphor used in the device, and a method of manufacturing the phosphor. Background technique [0002] Referring to FIG. 11 , an example of a conventional white light emitting device is illustrated. (See Optically Active Materials Manual Managing Editorial Group, Eds., "Optically Active Materials Manual," The Optronics Co., Ltd., June 1997.). In FIG. 11 , surrounding the InGaAs blue LED 101 disposed in the mounting portion 109 of the leadframe is a surrounding synthetic polymer casting 106 with YAG (yttrium-aluminum-corundum) phosphor dispersed therein. A molded synthetic polymer seal 116 seals the casting 106, the metal wires 105, and the lead frame. A voltage is applied through the two electrodes 107a and 107b through wires 105 separating parts of the lead frame, and current flows into the blue LED 101 to cause blue light to be emitted. A part of the blue light is used to excite the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/08C01B25/02C09K11/62C09K11/88H01J1/62H01L33/32H01L33/50H05B33/14
CPCC30B23/00H01L33/502C09K11/883Y02B20/181C30B29/48H01L2224/48091H01L2224/48247H01L2224/48257H01L2924/16195H01L2224/45144Y02B20/00H01L2924/00014H01L2924/00
Inventor 藤原伸介
Owner SUMITOMO ELECTRIC IND LTD
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