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Conversion LED

A technology of light-emitting diodes and light-emitting materials, which is applied to electrical components, circuits, semiconductor devices, etc., and can solve problems such as unimaginable solutions and thickness fluctuations

Inactive Publication Date: 2011-07-06
OSRAM GMBH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the problem of thickness fluctuations has hitherto been ignored because the solution seems unimaginable

Method used

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Embodiment Construction

[0025] according to figure 1 , the conversion light-emitting diode has a chip 2 emitting primary radiation. Typically, the primary radiation is blue radiation with a peak wavelength in the range of 420nm to 480nm, preferably 450nm to 470nm.

[0026] A potting 5 is applied to the chip, which contains a longer-wavelength phosphor 6 as a dispersion. In general, longer-wavelength phosphors are red-emitting phosphors as cited in the background art section, such as nitrides, oxynitrides (Oxinitrid) and as described in WO 2006 / 114077 like that. In addition to the phosphor particles, glass spheres 8 with a smaller dispersion width (Streubreite) are also contained in the potting partially with a defined diameter (for example, 500 nm). The second layer is placed on the layer of casting compound. This second layer is embodied as a ceramic converter lamella 10 which contains a yellow-green phosphor such as YAG:Ce. Such a ceramic converter is disclosed for example in US2004145308.

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Abstract

The invention relates to a novel conversion LED (1) having a first layer (5) on a chip (2), said layer comprising a first fluorescent substance (6) and being made of a potting material. A second layer (10), made of a solid body and comprising a second fluorescent substance, is disposed thereon. The first fluorescent substance (6) emits at a longer wavelength than the second fluorescent substance. The first layer (5) comprises spacers (8) determining the thickness of the first layer (5).

Description

technical field [0001] The invention relates to a conversion light-emitting diode (Konversions-LED) according to the preamble of claim 1 . Such luminescent materials are especially envisaged for use in white LEDs. Background technique [0002] WO 2006114077 shows a conversion light-emitting diode in which the converter is applied to the chip by means of screen printing. Similar content can also be found in WO 2007140766. [0003] Currently, great efforts are being made to use ceramic converters for conversion light-emitting diodes. The exact positioning of the converter on the LED chip affects here the reproducibility of the optical properties of the LED. The lateral position of the conversion element on the LED chip can be detected relatively easily by a camera and used for positioning control. [0004] The vertical position, ie the distance between chip and converter, is significantly more difficult to control. Previously used methods such as screen printing have pron...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L33/00
CPCH01L33/58H01L33/504
Inventor 迪尔克·贝尔本多米尼克·艾泽特
Owner OSRAM GMBH