Conversion element, component and process for producing a component

Patent metadata

Field	Value
Publication number	US-9688910-B2
Application number	US-201415102892-A
Country	US
Kind code	B2
Filing date	Dec 15, 2014
Priority date	Dec 19, 2013
Publication date	Jun 27, 2017
Grant date	Jun 27, 2017

Abstract

A conversion element, a component and a method for producing the component are disclosed. In an embodiment the conversion element includes a phosphor configured to convert electromagnetic primary radiation into electromagnetic secondary radiation and a glass composition as matrix material in which the phosphor is embedded. The glass composition has the following chemical composition: at least one tellurium oxide with a proportion of 65 mole % as a minimum and 90 mole % as a maximum, R 1 O with a proportion of between 0 mole % and 20 mole %, at least one M 1 2 O with a proportion of between 5 mole % and 25 mole %, at least one R 2 2 O 3 with a proportion of between 1 mole % and 3 mole %, M 2 O 2 with a proportion of between 0 mole % and 2 mole %, and R 3 2 O 5 with a proportion of between 0 mole % and 6 mole %.

First claim

The invention claimed is:

1. A conversion element comprising:
a phosphor configured to convert electromagnetic primary radiation into electromagnetic secondary radiation; and
a glass composition as matrix material in which the phosphor is embedded, wherein the glass composition has the following chemical composition:
at least one tellurium oxide with a proportion of 65 mole % as a minimum and 90 mole % as a maximum;
R 1 O with a proportion of between 0 mole % and 20 mole %, wherein R 1 is selected from Mg, Ca, Sr, Ba, Zn, Mn and combinations thereof;

at least one M 1 2 O with a proportion of between 5 mole % and 25 mole %, wherein M 1 is selected from Li, Na, K and combinations thereof;
at least one R 2 2 O 3 with a proportion of between 1 mole % and 3 mole %, wherein R 2 is selected from Al, Ga, In, Bi, Sc, Y, La, rare earths and combinations thereof;
M 2 O 2 with a proportion of between 0 mole % and 2 mole %, wherein M 2 is selected from Ti, Zr, Hf and combinations thereof; and
R 3 2 O 5 with a proportion of between 0 mole % and 6 mole %, wherein R 3 is Nb and/or Ta.

2. The conversion element according to claim 1 , wherein the glass composition is free of boron trioxide, germanium oxide, phosphates, halides, P 2 O 5 and SiO 2 , and wherein the glass composition has a glass transformation temperature of less than 320° C. and a dilatometric softening temperature of less than 400° C.

3. The conversion element according to claim 1 , wherein the tellurium oxide in the glass composition is TeO 2 and has a proportion of 67 mole % as a minimum and of 69 mole % as a maximum.

4. The conversion element according to claim 1 , wherein R 1 O in the glass composition has a proportion of between 14 mole % and 18 mole %.

5. The conversion element according to claim 1 , wherein M 1 2 O in the glass composition has a proportion of between 8 mole % and 14 mole %.

6. The conversion element according to claim 1 , wherein the glass composition is free of boron trioxide, germanium oxide, phosphates, halides, P 2 O 5 and SiO 2 .

7. The conversion element according to claim 1 , wherein R 2 is selected from the group consisting of Al, La, Y and Bi, and wherein R 2 2 O 3 has a proportion of between 1.5 mole % and 2.5 mole %.

8. The conversion element according to claim 1 , wherein the glass composition consists essentially of tellurium oxide, M 1 2 O and R 2 2 O 3 , and wherein R 2 2 O 3 has a proportion of between 1.5 mole % and 2 mole %.

9. The conversion element according to claim 1 , wherein the glass composition has a glass transformation temperature of less than 320° C. and a dilatometric softening temperature of less than 400° C.

10. The conversion element according to claim 1 , wherein the glass composition is radiolucent, and wherein at least 90% of an incidental electromagnetic radiation is transmitted from a wavelength range of 380 nm to 800 nm.

11. A component comprising the conversion element according to claim 1 .

12. The component according to claim 11 , wherein the component comprises a semiconductor chip configured to generate the electromagnetic primary radiation of at least a blue spectral range, and wherein the conversion element is arranged directly on the semiconductor chip.

13. The component according to claim 11 , wherein the component comprises a semiconductor chip, and wherein the conversion element is spatially separated from the semiconductor chip.

14. The component according to claim 11 , wherein the component comprises a semiconductor chip or a substrate, wherein the semiconductor chip is configured to generate the electromagnetic primary radiation of at least a blue spectral range, wherein the conversion element connects an additional layer with the semiconductor chip or the substrate, and wherein the additional layer is a ceramic conversion element.

15. A method for producing a component, the method comprising:
providing at least one semiconductor chip, which has a radiation exit surface, or a substrate;
attaching the conversion element pursuant to claim 1 on the radiation exit surface or on the substrate; and
heating the component to a maximum of 400° C., so that a composite is generated between the radiation exit surface or the substrate and the conversion element.

16. The method according to claim 15 , wherein attaching the conversion element on the radiation exit surface or the substrate comprising the conversion element as powder or as prefabricated body.

17. The method according to claim 15 , wherein the conversion element is generated by a glass composition designed as a layer, the glass composition being coated with at least one phosphor, and wherein the phosphor subsequently sinks into the glass composition.

18. The method according to claim 15 , wherein the conversion element is generated by introducing a phosphor into the glass composition and subsequently attaching such phosphor-glass composition mixture on the radiation exit surface or to the substrate.

Assignees

• Osram Gmbh

Inventors

• Eberhardt Angela
• Wille Christina

Classifications

• C03C2214/30

  Methods of making the composites · CPC title

• C03C3/122

  containing oxides of As, Sb, Bi, Mo, W, V, Te as glass formers · CPC title

• C09K11/025 Primary

  non-luminescent particle coatings or suspension media · CPC title

• C03C14/006

  the non-glass component being in the form of microcrystallites, e.g. of optically or electrically active material · CPC title

• C03C4/12

  for luminescent glass; for fluorescent glass · CPC title