Luminescent-substance mixture, light-emitting semiconductor component having a luminescent-substance mixture, and streetlamp having a luminescent-substance mixture

Patent metadata

Field	Value
Publication number	US-2016304780-A1
Application number	US-201415101094-A
Country	US
Kind code	A1
Filing date	Nov 18, 2014
Priority date	Dec 3, 2013
Publication date	Oct 20, 2016
Grant date	—

Abstract

A luminescent material mixture has a first luminescent material and a second luminescent material, wherein, under excitation with blue light, an emission spectrum of the first luminescent material has a relative intensity maximum in a yellowish-green region of the spectrum at a wavelength of greater than or equal to 540 nm and less than or equal to 560 nm and an emission spectrum of the second luminescent material has a relative intensity maximum in an orange-red region of the spectrum at a wavelength of greater than or equal to 600 nm and less than or equal to 620 nm.

First claim

1 - 19 . (canceled)

20 . A luminescent material mixture having a first luminescent material and a second luminescent material, wherein, under excitation with blue light, an emission spectrum of the first luminescent material has a relative intensity maximum in a yellowish-green region of the spectrum at a wavelength of greater than or equal to 540 nm and less than or equal to 560 nm and an emission spectrum of the second luminescent material has a relative intensity maximum in an orange-red region of the spectrum at a wavelength of greater than or equal to 600 nm and less than or equal to 620 nm.

21 . The luminescent material mixture according to claim 20 , wherein the first luminescent material is a garnet luminescent material.

22 . The luminescent material mixture according to claim 20 , wherein the first luminescent material has a relative intensity maximum at a wavelength of greater than or equal to 545 nm and less than or equal to 555 nm.

23 . The luminescent material mixture according to claim 20 , wherein the first luminescent material is (Y,Lu,Gd,Ce) 3 (Al,Ga) 5 O 12 .

24 . The luminescent material mixture according to claim 20 , wherein the first luminescent material is (Y,Lu,Ce) 3 Al 5 O 12 and (Y,Lu,Ce) 3 (Al,Ga) 5 O 12 and has a maximum excitability at a wavelength of greater than or equal to 440 nm and less than or equal to 460 nm, preferably of greater than or equal to 445 nm and less than or equal to 455 nm.

25 . The luminescent material mixture according to claim 20 , wherein the first luminescent material is (Y,Lu,Ce) 3 Al 5 O 12 with a Ce content of greater than or equal to 0.5% and less than or equal to 5% and a Y content of greater than or equal to 0% and less than or equal to 20%.

26 . The luminescent material mixture according to claim 25 , wherein the Ce content is greater than or equal to 1% and less than or equal to 3% and the Y content is greater than or equal to 5% and less than or equal to 20%.

27 . The luminescent material mixture according to claim 20 , wherein the second luminescent material is a nitridosilicate luminescent material.

28 . The luminescent material mixture according to claim 20 , wherein the second luminescent material has a relative intensity maximum at a wavelength of greater than or equal to 605 nm and less than or equal to 615 nm.

29 . The luminescent material mixture according to claim 20 , wherein the second luminescent material is selected from (Ca,Sr,Ba,Eu) 2 Si 5 N 8 , (Ca,Sr,Eu)AlSiN 3 .Si 2 N 2 O and (Ca,Sr,Eu)AISiN 3 .

30 . The luminescent material mixture according to claim 20 , wherein the second luminescent material is (Ca,Sr,Ba,Eu) 2 Si 5 N 8 with an Eu content of greater than or equal to 0.5% and less than or equal to 4%, with a Ba content of greater than or equal to 30% and less than or equal to 70% and with a Ca content of greater than or equal to 0% and less than or equal to 20%, wherein the Sr content is selected such that the sum of the Eu, Ba, Ca and Sr contents is 100%.

31 . The luminescent material mixture according to claim 30 , wherein the Eu content is greater than or equal to 1% and less than or equal to 2.5%, the Ba content is greater than or equal to 45% and less than or equal to 55% and the Ca content is greater than or equal to 0% and less than or equal to 10%.

32 . The luminescent material mixture according to claim 20 , wherein the second luminescent material is (Ca,Sr,Eu)AlSiN 3 .Si 2 N 2 O with an Eu content of greater than or equal to 0.1% and less than or equal to 2% and with an Sr content of greater than or equal to 60% and less than 100%, wherein the Ca content is selected such that the sum of the Eu, Sr and Ca contents is 100%.

33 . The luminescent material mixture according to claim 20 , wherein the first and second luminescent materials are particles.

34 . The luminescent material mixture according to claim 20 , wherein the second luminescent material is (Ca,Sr,Eu)AlSiN 3 .Si 2 N 2 O and takes the form of particles with an inert coating selected from SiO 2 and Al 2 O 3 .

35 . A light-emitting semiconductor device comprising a light-emitting semiconductor chip which, when in operation, emits light in a first wavelength range and the luminescent material mixture according to claim 20 , that converts at least one part of the light in the first wavelength range emitted by the light-emitting semiconductor chip into light in a second wavelength range different from the first and into light in a third wavelength range different from the first and second.

36 . The light-emitting semiconductor device according to claim 35 , wherein the first wavelength range has a dominant wavelength of greater than or equal to 440 nm and less than or equal to 460 nm and preferably of greater than or equal to 445 nm and less than or equal to 455 nm.

37 . The light-emitting semiconductor device according to claim 36 , that emits white light composed of light of the first wavelength range and light of the second and third wavelength ranges and has a color rendering index of greater than or equal to 70 at a color temperature of greater than or equal to 3000 K and less than or equal to 6500 K.

38 . A streetlamp comprising a light-emitting semiconductor device according to claim 35 .

39 . A luminescent material mixture having a first luminescent material and a second luminescent material,
wherein under excitation with blue light, an emission spectrum of the first luminescent material has a relative intensity maximum in a yellowish-green region of the spectrum at a wavelength of greater than or equal to 540 nm and less than or equal to 560 nm and an emission spectrum of the second luminescent material has a relative intensity maximum in an orange-red region of the spectrum at a wavelength of greater than or equal to 600 nm and less than or equal to 620 nm, and the second luminescent material is selected from (Ca,Sr,Eu)AlSiN 3 .Si 2 N 2 O or (Ca,Sr,Ba,Eu) 2 Si 5 N 8 with an Eu content of greater than or equal to 1% and less than or equal to 2.5%, with a Ba content of greater than or equal to 45% and less than or equal to 55% and with a Ca content of greater than or equal to 0% and less than or equal to 10%, wherein the Sr content is selected such that the sum of the Eu, Ba, Ca and Sr contents is 100%.

Assignees

• Osram Opto Semiconductors Gmbh

Inventors

• Römer Rebecca
• Huckenbeck Barbara
• Lange Stefan
• Cui Hailing

Classifications

• C09K11/77348

  Silicon Aluminium Nitrides or Silicon Aluminium Oxynitrides · CPC title

• C09K11/7774 Primary

  Aluminates · CPC title

• H10H20/8514

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

• H10H20/8513

  having two or more wavelength conversion materials · CPC title

• F21Y2115/10

  Light-emitting diodes [LED] · CPC title