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Dielectric film coating for full conversion ceramic platelets

A wavelength converter, coating technology, applied in circuits, electrical components, electrical solid devices, etc., can solve problems such as difficulties

Pending Publication Date: 2021-09-10
OSRAM OPTO SEMICONDUCTORS GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since (Sr,Ba) 2 Si 5 N 8 : The crystal structure of Eu is not cubic, so there is always grain boundary scattering caused by birefringence
In addition, since from Ba 1 Si 7 N 10 Scattering of the second phase is always present, so complete removal of the second phase is difficult
Therefore, there is a limit in improving efficiency by reducing porosity due to the inability to avoid scattering from grain boundaries and second phases

Method used

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  • Dielectric film coating for full conversion ceramic platelets
  • Dielectric film coating for full conversion ceramic platelets
  • Dielectric film coating for full conversion ceramic platelets

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Embodiment Construction

[0055] For a better understanding of the present invention, together with other and additional objects, advantages and functions thereof, reference is made to the following disclosure and appended claims taken in conjunction with the above-mentioned accompanying drawings.

[0056] Unless otherwise stated, references to the color of a phosphor, LED, or conversion material generally refer to its emission color. Thus, a blue LED emits blue light, a yellow phosphor emits yellow light, and so on.

[0057] The present invention relates to a wavelength converter comprising:

[0058] phosphor layer, and

[0059] filter layer,

[0060] wherein the filter layer is directly attached to the phosphor layer, and wherein the wavelength converter has a total thickness of 20 μm to 80 μm.

[0061] As used herein, a wavelength converter is a solid structure that converts at least a portion of light of a specific first wavelength into light of a specific second wavelength. In one embodiment, ...

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Abstract

The present invention is directed to a wavelength converter comprising: - a phosphor layer and - a filter layer, wherein the filter layer is directly attached to the phosphor layer and wherein the wavelength converter has an overall thickness of between 20 [mu]m to 80 [mu]m. Furthermore, the present invention is directed to a light emitting device assembly and methods for preparing a wavelength converter and methods for preparing a light emitting device assembly.

Description

technical field [0001] The present invention relates to wavelength converters, light emitting device assemblies and methods for producing wavelength converters and light emitting devices. Background technique [0002] Several implementations of phosphor wavelength converters exist in the prior art. Typically, ceramic phosphor materials are used to convert light of a specific wavelength into a specific additional wavelength. However, some ceramic phosphor materials exhibit scattering. [0003] For example, with components (Sr,Ba) 2 Si 5 N 8 :Eu's amber ceramics are used in full-conversion LED applications, where the blue light from the blue LED die is completely or nearly completely absorbed by the amber ceramic sheet converter on top of the LED die, and at longer re-emitted as amber light at a wavelength of . Full-conversion amber LEDs have a wide range of applications, such as automotive turn signals and tail lights, emergency vehicle signals, and traffic lights. [...

Claims

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Application Information

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IPC IPC(8): H01L33/50C04B35/01
CPCH01L33/505H01L33/507C09K11/0883C03C17/34H01L2924/181H01L2224/48091C09K11/77347H01L2924/00012H01L2924/00014H01L33/50H01L33/501H01L33/502H01L33/504H01L33/508H01L2933/0041
Inventor 郑毅多米尼克·艾泽特乔治·罗斯巴赫
Owner OSRAM OPTO SEMICONDUCTORS GMBH