Optoelectronic semiconductor component, conversion-medium lamina and method for producing a conversion-medium lamina

Patent metadata

Field	Value
Publication number	US-9406847-B2
Application number	US-201314420310-A
Country	US
Kind code	B2
Filing date	Jul 30, 2013
Priority date	Aug 8, 2012
Publication date	Aug 2, 2016
Grant date	Aug 2, 2016

Abstract

In at least one embodiment, the semiconductor component includes an optoelectronic semiconductors chip. Furthermore, the semiconductor component includes a conversion-medium lamina, which is fitted to a main radiation side of the semiconductor chip and is designed for converting a primary radiation into a secondary radiation. The conversion-medium lamina includes a matrix material and conversion-medium particles embedded therein. Furthermore, the conversion-medium lamina includes a conversion layer. The conversion-medium particles are situated in the at least one conversion layer. The conversion-medium particles, alone or together with diffusion-medium particles optionally present, make up a proportion by volume of at least 50% of the conversion layer. Furthermore, the conversion-medium lamina includes a binder layer containing the conversion-medium particles with a proportion by volume of at most 2.5%.

First claim

The invention claimed is:

1. An optoelectronic semiconductor component comprising:
an optoelectronic semiconductor chip designed for generating a primary radiation; and
a conversion-medium lamina attached to a main radiation side of the semiconductor chip, the conversion-medium lamina designed for at least partly converting the primary radiation into a secondary radiation,
wherein the conversion-medium lamina comprises a matrix material and conversion-medium particles, the conversion-medium particles comprising first and second conversion-medium particles embedded in the matrix material,
wherein the conversion-medium lamina comprises a first conversion layer, a further conversion layer and a binder layer, the further conversion layer being arranged between the first conversion layer and the binder layer,
wherein the first conversion layer is situated closest to the semiconductor chip, and in which the conversion-medium particles, alone or together with diffusion-medium particles, are present with a proportion by volume of at least 50%,
wherein the binder layer is situated furthest away from the semiconductor chip and in which the conversion-medium particles have a proportion by volume of at most 2.5%,
wherein the first conversion layer comprises the first conversion-medium particles for generating a longer-wave radiation,
wherein the further conversion layer comprises the second conversion-medium particles for generating a shorter-wave radiation,
wherein the first conversion-medium particles have a smaller average diameter than the second conversion-medium particles, and
wherein a concentration of the first conversion-medium particles of the first conversion layer is higher than a concentration of the second conversion-medium particles of the further conversion layer.

2. The optoelectronic semiconductor component according to claim 1 , wherein
the first and second conversion-medium particles, alone or together with diffusion-medium particles, are present a close-packed fashion.

3. The optoelectronic semiconductor component according to claim 1 , wherein the first conversion layer and the binder layer each comprise a matrix material into which the first conversion-medium particles are embedded, wherein the matrix material is a silicone, an epoxide or a silicone-epoxide hybrid material.

4. The optoelectronic semiconductor component according to claim 1 , wherein the conversion-medium lamina comprises a plurality of the conversion layers, wherein the first conversion layer situated closest to the semiconductor chip comprises the first conversion-medium particles for generating red light, wherein the further conversion layer comprises the second conversion-medium particles for generating green light, and wherein the first conversion-medium particles and second conversion-medium particles, alone or together with diffusion-medium particles, are present in a close-packed fashion.

5. The optoelectronic semiconductor component according to claim 4 , wherein the first and further conversion layers and the binder layer directly succeed one another and the first conversion-medium particles have an average diameter of between 0.5 μm and 5.0 μm inclusive and the second conversion-medium particles have an average diameter of between 5 μm and 25 μm inclusive.

6. The optoelectronic semiconductor component according to claim 1 , further comprising a carrier having a carrier top side, wherein the semiconductor chip is attached to the carrier top side and the conversion-medium lamina is spaced apart from the carrier.

7. The optoelectronic semiconductor component according to claim 1 , wherein the first and second conversion-medium particles mutually touch one another at least in part, such that in places no matrix material is situated between the first and second conversion-medium particles.

8. The optoelectronic semiconductor component according to claim 1 , wherein the conversion-medium lamina has a thickness of between 30 μm and 300 μm inclusive, wherein the binder layer makes up a proportion of the thickness of the conversion-medium lamina of at least 70%.

9. The optoelectronic semiconductor component according to claim 1 , further comprising a transition layer between the binder layer and the directly adjoining further conversion layer, the transition layer having a thickness of at most 1.5 times the average diameter of the first conversion-medium particles of the first conversion layer.

10. The optoelectronic semiconductor component according to claim 1 , wherein the conversion-medium lamina comprises a plurality of the first conversion layers, wherein a first conversion layer situated closer to the semiconductor chip also comprises the second conversion-medium particles from the further conversion layer, and wherein the further conversion layer is free of the first conversion-medium particles from the first conversion layer situated closer to the semiconductor chip.

11. The optoelectronic semiconductor component according to claim 1 , wherein the conversion-medium lamina is restricted to the main radiation side and does not project laterally beyond the semiconductor chip.

12. The optoelectronic semiconductor component according to claim 1 , wherein the conversion-medium lamina comprises the diffusion-medium particles;
wherein the diffusion-medium particles are formed from a radiation-transmissive material;
wherein an average diameter of the diffusion-medium particles is between 2 μm and 6 μm inclusive; and
wherein a proportion by volume of the diffusion-medium particles in the first conversion layer is at most 2.5% and in binder layer is between 1.0% and 20% inclusive.

13. The optoelectronic semiconductor component according to claim 1 , wherein the first conversion-medium particles are configured for generating red light and the second conversion-medium particles are configured for generating green light.

14. The optoelectronic semiconductor component according to claim 1 , wherein the conversion-medium lamina has a gradient with regard to a proportion by volume of the first conversion-medium particles, and wherein the proportion by volume of the first conversion-medium particles decreases from the first conversion layer via the further conversion layer to the binder layer.

15. The optoelectronic semiconductor component according to claim 1 , wherein the binder layer has a proportion of a thickness of the conversion-medium lamina of at least 60% and is configured to mechanically support the conversion-medium lamina.

16. A conversion-medium lamina for an optoelectronic semiconductor component comprising a matrix material and conversion-medium particles embedded therein, wherein:
the conversion-medium lamina comprises one or more conversion layers in which the conversion-medium particles, alone or together with diffusion-medium particles, are present with a proportion by volume of at least 50%;
the conversion-medium lamina comprises a binder layer in which the conversion-medium particles have a proportion by volume of at most 0.5%;
the conversion-medium lamina is mechanically self-supporting;
the conversion-medium lamina comprises a first conversion layer and a further conversion layer, wherein the further conversion layer is arranged between the first conversion layer and the binder layer;
the first conversion layer comprises first conversion-medium particles for generating a longer-wave radiation and the further conversion layer comprises second conversion-medium particles for generating a shorter-wave radiation;
the first conversion-medium particles have a smaller average diameter than the second

Assignees

• Osram Opto Semiconductors Gmbh

Inventors

• Markytan Ales
• Gärtner Christian
• Gallmeier Hans-Christoph
• Stoll Ion
• Brunner Herbert
• Schlereth Thomas

Classifications

• H10H20/8513

  having two or more wavelength conversion materials · CPC title

• H10H20/8516

  having a non-uniform spatial arrangement or non-uniform concentration, e.g. patterned wavelength conversion layer or wavelength conversion layer with a concentration gradient · CPC title

• H10H20/8514 Primary

  characterised by their shape, e.g. plate or foil · CPC title

• H10H20/8511 Primary

  characterised by their material, e.g. binder · CPC title

• H01L33/505

  Electricity · mapped topic