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Structured substrate for a LED

A structured and substrate technology, applied in the direction of instruments, electrical components, circuits, etc., can solve problems such as low light output and unsatisfactory light output, and achieve the effect of avoiding production failure

Inactive Publication Date: 2009-12-30
KONINK PHILIPS ELECTRONICS NV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Theoretically, it can be expected that the pyramidal structure can improve the outcoupling of light (thus increasing the light output), but in the real EL layered structure, there are serious absorption losses, and this theoretical improvement may even lead to a higher than that from the planar substrate. lower light output
The light output of about 20% to 26% achieved by current EL light sources is unsatisfactory

Method used

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  • Structured substrate for a LED
  • Structured substrate for a LED
  • Structured substrate for a LED

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Embodiment Construction

[0028] figure 1is a plan view of a substrate 1 according to the invention, wherein the substrate has a structured side 1b for efficient coupling-out of light. In this case the other side 1a of the substrate, which is planar for applying the electroluminescent layered structure for emitting light, is not shown. The structured second side 1b of the substrate comprises in this case at least one element of a structure 2 comprising a first region 3 having a first surface with a surface roughness between 0.2 μm and 100 μm , preferably between 0.4 μm and 70 μm, and particularly preferably between 0.7 μm and 40 μm. Light rays reflected back at the rough surface have, after reflection, locally varying widely varying directions of propagation in the substrate. Therefore, the light initially reflected back will be coupled out at the second side 1b of the substrate 1 after a small number of reflections at the EL layered structure and / or at the first side 1a of the substrate, which has a...

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Abstract

A substrate (1) made of a transparent material, preferably glass, which substrate has a planar first side (1a) for the application of an electroluminescent layered structure (21, 22, 23) for emitting light and having a structured second side (1b) for the effective coupling-out of light (6), comprising at least one element of structure (2) comprising first regions (3) having first surfaces (3a) that have a surface roughness of between 0.2 m and 100 m, and preferably of between 0.4 m and 70 m, and as a particular preference of between 0.7 m and 40 m.

Description

technical field [0001] The invention relates to an electroluminescent light source and a structured transparent substrate for increasing light outcoupling. Background technique [0002] Known electroluminescent light sources (EL light sources) comprise a plurality of thin layers (EL layered structure) and have an electroluminescent layer (EL layer) for emitting light. In so-called bottom emitters, the light reaches the observer through a transparent substrate. When the light leaves the EL layered structure, from the optically dense medium (refractive index n 2 >1 transparent substrate) transition to optically rarefied medium (refractive index n 1 = 1 for air). The angle of incidence of light and its angle of exit (also called angle of incidence on the second medium) are determined by the laws of refraction. If the light is at the interface between the substrate and the air at an angle greater than the critical angle α = sin -1 (n 1 / n 2 ), it is not coupled out fro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01L33/00H01L33/22H01L33/58
CPCH01L33/58H01L51/5268H01L33/22G02B5/045H10K50/854H05B33/02
Inventor H·-H·贝克特尔W·巴塞尔特
Owner KONINK PHILIPS ELECTRONICS NV