Light emitting device

• US 7,554,129 B2
• Filed: 12/30/2004
• Issued: 06/30/2009
• Est. Priority Date: 06/10/2004
• Status: Active Grant

• Current Assignee: Seoul Semiconductor Co., Ltd.
• Original Assignee: Seoul Semiconductor Co., Ltd.
• Inventors: Roth, Gundula, Tews, Walter, Lee, Chung Hoon
• Primary Examiner(s): Parker; Kenneth A
• Assistant Examiner(s): Nguyen; Joseph
• Application Number:
  US11/024,702
• Publication Number:
  US 20050274972A1
• Time in Patent Office: 1,643 Days
• Field of Search: 257/81, 257/88, 257 98-100, 257/E33.058, 257/79, 257/103, 313498-500, 313/502, 313/503, 438/22, 438/24, 252/301.4 R, 252/301.4 P, 252/301.6 R
• US Class Current: 257/100
• CPC Class Codes: C09K 11/665 with alkali or alkaline earth metals
• CPC Class Codes: C09K 11/666 Aluminates; Silicates
• CPC Class Codes: C09K 11/753 with alkaline earth metals
• CPC Class Codes: C09K 11/756 with alkali or alkaline earth metals
• CPC Class Codes: C09K 11/7734 Aluminates
• CPC Class Codes: C09K 11/77342 Silicates
• CPC Class Codes: C09K 11/77344 Aluminosilicates
• CPC Class Codes: C09K 11/7735 Germanates
• CPC Class Codes: C09K 11/7738 with alkaline earth metals
• CPC Class Codes: C09K 11/7739 with halogens
• CPC Class Codes: C09K 11/774 Borates
• CPC Class Codes: C09K 11/7751 Vanadates; Chromates; Molybdates; Tungstates
• CPC Class Codes: C09K 11/7756 containing neodynium
• CPC Class Codes: C09K 11/7796 with alkaline earth metals
• CPC Class Codes: H01L 2224/48091 Arched
• CPC Class Codes: H01L 2224/48247 connecting the wire to a bond pad of the item
• CPC Class Codes: H01L 2224/73265 Layer and wire connectors
• CPC Class Codes: H01L 2924/00014 the subject-matter covered by the group, the symbol of which is combined with the symbol of this group, being disclosed without further technical details
• CPC Class Codes: H01L 33/502 Wavelength conversion materials

Abstract

A light emitting device can include a substrate, electrodes provided on the substrate, a light emitting diode configured to emit light, the light emitting diode being provided on one of the electrodes, phosphors configured to change a wavelength of the light, and an electrically conductive device configured to connect the light emitting diode with another of the plurality of electrodes. The phosphors can substantially cove at least a portion of the light emitting diode. The phosphor may include aluminate type compounds, lead and/or copper doped silicates, lead and/or copper doped antimonates, lead and/or copper doped germanates, lead and/or copper doped germanate-silicates, lead and/or copper doped phosphates, or any combination thereof.

Claims

1. A light emitting device, comprising:

a light emitting diode configured to emit light; and

a phosphor configured to change a wavelength of the light, the phosphor substantially covering at least a portion of the light emitting diode;

wherein said phosphor comprises a compound including a host material, wherein divalent copper ions and oxygen are components of the host material,

wherein the compound has the formula

a(M′

O).b(M″

₂O).c(M″

X).d(Al₂O₃).e(M′

″

O).f(M<sub>″

″

2</sub>O₃).g(M′

″

″

_oO_p).h(M″

″

″

_xO_y)

wherein

M′

is Cu, or a combination of Cu and Pb;

M″

is Li, Na, K, Rb, Cs, Au, Ag or any combination thereof;

M′

″

is Be, Mg, Ca, Sr, Ba, Zn, Cd, Mn or any combination thereof;

M″

″

is Sc, B, Ga, In, or any combination thereof;

M′

″

″

is Si, Ge, Ti, Zr, Mn, V, Nb, Ta, W, Mo, or any combination thereof;

M″

″

″

is Bi, Sn, Sb, Sc, Y, La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, or any combination thereof;

X is F, Cl, Br, I, or any combination thereof;

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2. The light emitting device according to claim 1, wherein the phosphor includes one or more single compounds or any combination thereof.

3. The light emitting device according to claim 1, further comprising a sealing material configured to cover the light emitting diode and the phosphor.

4. The light emitting device according to claim 3, wherein the phosphor is distributed in the sealing material.

5. The light emitting device according to claim 1, wherein the phosphor is mixed with a hardening material.

6. The light emitting device according to claim 1, wherein the light emitting diode comprises a plurality of light emitting diodes.

7. The light emitting device according to claim 1, wherein the phosphor further comprises an aluminate containing copper, an antimonate containing copper, a germanate containing copper, a germanate-silicate containing copper, a phosphate containing copper, or any combination thereof.

8. The light emitting device according to claim 1, further comprising:

a substrate;

a plurality of electrodes provided on the substrate; and

an electrically conductive device configured to connect the light emitting diode with one of the plurality of electrodes;

wherein the light emitting diode is provided on another of the plurality of electrodes.

9. The light emitting device according to claim 8, further comprising electrically conductive paste provided between the light emitting diode and one of the plurality of electrodes.

10. The light emitting device according to claim 8, further comprising a reflector configured to reflect the light from the light emitting diode.

11. The light emitting device according to claim 1, further comprising:

a plurality of leads;

a diode holder provided at the end of one of the plurality of leads; and

an electrically conductive device configured to connect the light emitting diode with another of the plurality of leads,

wherein the light emitting diode is provided in the diode holder and includes a plurality of electrodes.

12. The light emitting device according to claim 11, further comprising electrically conductive paste provided between the light emitting diode and one of the plurality of electrodes.

13. The light emitting device according to claim 1, further comprising:

a housing;

a heat sink at least partially provided in the housing;

a plurality of lead frames provided on or around the heat sink; and

an electrically conductive device configured to connect the light emitting diode with one of the plurality of lead frames,

wherein the light emitting diode is disposed over the heat sink.

14. The light emitting device according to claim 13, further comprising electrically conductive paste provided between the light emitting diode and the heat sink.

15. The light emitting device according to claim 13, wherein at least one of the plurality of lead frames protrudes from the housing.

16. The light emitting device according to claim 13, wherein the heat sink comprises a plurality of heat sinks.

17. The light emitting device according to claim 1, wherein lead is a component of the host material.

18. A light emitting device, comprising:

a light emitting diode configured to emit light; and

a phosphor configured to change a wavelength of the light, the phosphor substantially covering at least a portion of the light emitting diode;

wherein said phosphor comprises a compound including a host material, wherein divalent copper ions and oxygen are components of the host material,

wherein the compound has the formula

a(M′

O)·

b(M″

₂O)·

c(M″

X)·

4-a-b-c(M′

″

O)·

7(Al₂O₃)·

d(B₂O₃)·

e(Ga₂O₃)·

f(SiO₂)·

g(GeO₂)·

h (M″

″

_xO_y)

wherein

M′

is Cu, or a combination of Cu and Pb;

M″

is Li, Na, K, Rb, Cs, Au, Ag, or any combination thereof;

M′

″

is Be, Mg, Ca, Sr, Ba, Zn, Cd, Mn, or any combination thereof;

M″

″

is Bi, Sn, Sb, Sc, Y, La, In, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, or any combination thereof;

X is F, Cl, Br, I, or any combination thereof;

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