Nitride and oxy-nitride cerium based phosphor materials for solid-state lighting applications
First Claim
1. An apparatus for solid state lighting applications, comprising:
- a light emitting diode (LED); and
a luminescent cerium (Ce) compound comprising a Ce3+ doped compound from the quartenary Ca—
Al—
Si—
N system;
wherein the luminescent Ce compound emits yellow light when excited by radiation from the LED.
2 Assignments
0 Petitions
Accused Products
Abstract
Three new cerium (Ce) based phosphor materials based on nitride and oxy-nitride compounds emit yellow or blue to green photons upon excitation by ultraviolet (UV) or blue light radiation. The two yellow emitting compounds belong to the quartenary Ca—Al—Si—N system with distinct structures. These bright yellow phosphors can be used for white light applications by combining either a blue light emitting diode (LED) and a yellow phosphor, a blue LED and green-orange phosphors, or an ultraviolet (UV) LED with three phosphors, i.e., red, blue and green (RGB) phosphors. The bright blue-green phosphor, which may be described by Sr2SiO4-δNδ, can be used in the UV LED plus 3 RGB phosphors setup.
-
Citations
36 Claims
-
1. An apparatus for solid state lighting applications, comprising:
-
a light emitting diode (LED); and
a luminescent cerium (Ce) compound comprising a Ce3+ doped compound from the quartenary Ca—
Al—
Si—
N system;
wherein the luminescent Ce compound emits yellow light when excited by radiation from the LED. - View Dependent Claims (2, 3, 4)
-
-
5. A composition of matter, comprising:
a luminescent cerium (Ce) compound that emits yellow light when excited by radiation, wherein the luminescent Ce compound is a Ce3+ doped compound from the quartenary Ca—
Al—
Si—
N system.- View Dependent Claims (6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
-
20. A method for creating a luminescent cerium (Ce) compound, comprising the steps of:
-
(a) mixing stoichiometric amounts of (1) Ca3N2 or Ca metal, (2) AlN, (3) Si3N4, Si2N2NH, or Si(NH)2, and (4) Ce to create a mixture, wherein the Ce is in the form of a metal, nitride, or oxide;
(b) weighing and grinding the mixture in conditions of [O2]<
1 parts per million (ppm) and [H2O]<
1 ppm in order to prevent oxidation or hydrolysis; and
(c) heating the mixture to a temperature between 1450°
C. and 1600°
C. under flowing hydrogen and nitrogen (H2/N2) with a ratio of 5;
95 at 0.2 to 0.5 liters per minute. - View Dependent Claims (21)
-
-
22. An apparatus for solid state lighting applications, comprising:
-
a light emitting diode (LED); and
a luminescent cerium (Ce) compound that emits blue-green light when excited by radiation from the light emitting diode. - View Dependent Claims (23, 24)
-
-
25. A composition of matter, comprising:
a luminescent cerium (Ce) compound that emits blue-green light when excited by radiation. - View Dependent Claims (26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36)
Specification