White light emitting diode (LED) lighting device driven by pulse current

• US 8,877,527 B2
• Filed: 12/16/2013
• Issued: 11/04/2014
• Est. Priority Date: 03/12/2010
• Status: Active Grant

• Current Assignee: Sichuan Sunfor Light Co. Ltd.
• Original Assignee: Sichuan Sunfor Light Co. Ltd.
• Inventors: Zhang, Ming, Zhao, Kun, Li, Dong-ming
• Primary Examiner(s): Pham, Hoai V
• Application Number:
  US14/107,387
• Publication Number:
  US 20140132177A1
• Time in Patent Office: 323 Days
• Field of Search: 438/22, 438/25, 438/28, 438/29, 257/E21.527
• US Class Current: 438/22
• CPC Class Codes: C09K 11/586 with alkaline earth metals
• CPC Class Codes: C09K 11/7421 with alkaline earth metals
• CPC Class Codes: C09K 11/7703 with alkaline earth metals
• CPC Class Codes: C09K 11/7761 with alkaline earth metals
• CPC Class Codes: C09K 11/7774 Aluminates
• CPC Class Codes: C09K 11/77744 Aluminosilicates
• CPC Class Codes: C09K 11/7792 Aluminates
• CPC Class Codes: C09K 11/77922 Silicates
• CPC Class Codes: H01L 33/504 Elements with two or more wavelength conversion materials
• CPC Class Codes: H05B 33/12 Light sources with substantially two-dimensional radiating surfaces
• CPC Class Codes: H05B 44/00 Circuit arrangements for operating electroluminescent light sources for operating light emitting diodes H05B45/00
• CPC Class Codes: H05B 45/32 Pulse-control circuits
• CPC Class Codes: Y02B 20/00 Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
• CPC Class Codes: Y02B 20/30 Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]

Abstract

A white LED lighting device driven by a pulse current is provided, which consists of blue, violet or ultraviolet LED chips, blue afterglow luminescence materials A and yellow luminescence materials B. Wherein the weight ratio of the blue afterglow luminescence materials A to the yellow luminescence materials B is 10-70 wt %:30-90 wt %. The white LED lighting device drives the LED chips with a pulse current having a frequency of not less than 50 Hz. Because of using the afterglow luminescence materials, the light can be sustained when an excitation light source disappears, thereby eliminating the influence of LED light output fluctuation caused by current variation on the illumination. At the same time, the pulse current can keep the LED chips being at an intermittent work state, so as to overcome the problem of chip heating.

Claims

1. A method of using a white LED lighting device, comprising:

connecting a white LED lighting device to a power source, wherein the white LED lighting device comprises blue, violet or ultraviolet LED chips and luminescence material, the luminescence material being a combination of blue afterglow luminescence material A and yellow luminescence material B, the yellow luminescence material B being able to emit light under excitation of the blue, violet or ultraviolet LED chips and/or excitation of the blue afterglow luminescence material A, a weight ratio (A;

B) between the blue afterglow luminescence material A and the yellow luminescence material B being 10˜

70 wt %;

30˜

90 wt %; and

providing a pulse current having a frequency of not less than 50 Hz to drive the LED chips to generate a white LED light.

2. The method of claim 1, wherein the weight ratio (A:

B) between the blue afterglow luminescence material A and the yellow luminescence material B is 20˜

50 wt %;

50˜

80 wt %.

3. The method of claim 1, wherein the weight ratio (A:

B) between the blue afterglow luminescence material A and the yellow luminescence material B is 35˜

50 wt %;

50˜

65 wt %.

4. The method of claim 1, wherein the weight ratio (A:

B) between the blue afterglow luminescence material A and the yellow luminescence material B is 40˜

50 wt %;

50˜

60 wt %.

5. The method of claim 1, wherein the blue afterglow luminescence material A has a peak light-emitting wavelength of 440˜

490 nm.

6. The method of claim 1, wherein the yellow luminescence material B has a peak light-emitting wavelength of 520˜

580 nm.

7. The method of claim 1, wherein the blue afterglow luminescence material A comprises one or more materials selected from the group consisting of Sr₄Al₁₄O₂₅:

Eu²⁺,Dy³⁺, Sr₂MgSi₂O₇;

Eu²⁺,Dy³⁺, CaS;

Bi³⁺,Na⁺, CaS;

Cu⁺,Na⁺ and CaSrS;

Bi³⁺.

9. The method of claim 1, wherein the yellow luminescence material B is a yellow luminescence material with or without an afterglow phenomenon, or a combination thereof.

10. The method of claim 1, wherein the blue afterglow luminescence material A comprises one or more materials selected from the group consisting of Sr₄Al₁₄O₂₅:

Eu²⁺,Dy³⁺, Sr₂MgSi₂O₇;

Eu²⁺,Dy³⁺, CaS;

Bi³⁺,Na⁺, CaS;

Cu⁺,Na⁺ and CaSrS;

Bi³⁺, and wherein the yellow luminescence material B comprises one or more materials selected from the group consisting of Y₂O₃.Al₂O₃.SiO₂;

Ce.B.Na.P, Y₃Al₅O₁₂;

Ce, Tb₃Al₅O₁₂;

Ce, Y₂O₂S;

Mg,Ti, Sr₃SiO₅;

Eu²⁺,Dy³⁺, Ca₂MgSi₂O₇;

Eu²⁺,Dy³⁺, CaS;

Sm³⁺, YAG;

Ce and TAG;

Ce.

8. A method of producing LED light, comprising:

mixing a blue afterglow luminescence material A with a yellow luminescence material B to form a mixture, wherein the yellow luminescence material B is able to emit light under excitation of the blue, violet or ultraviolet LED chips and/or excitation of the blue afterglow luminescence material A, wherein the blue afterglow luminescence material A and the yellow luminescence material B is mixed at a weight ratio (A;

B) of 10˜

70 wt %;

30˜

90 wt %;

packing or coating at least one blue, violet or ultraviolet LED chip with the mixture; and

providing a pulse current having a frequency of not less than 50 Hz to drive the LED chips to generate a white LED light.

11. The method of claim 8, wherein the yellow luminescence material B comprises one or more materials selected from the group consisting of Y₂O₃.Al₂O₃.SiO₂:

Ce.B.Na.P, Y₃Al₅O₁₂;

Ce, Tb₃Al₅O₁₂;

Ce, Y₂O₂S;

Mg,Ti, Sr₃SiO₅;

Eu²⁺,Dy³⁺, Ca₂MgSi₂O₇;

Eu²⁺,Dy³⁺, CaS;

Sm³⁺, YAG;

Ce and TAG;

Ce.

12. The method of claim 8, wherein the weight ratio (A:

B) between the blue afterglow luminescence material A and the yellow luminescence material B is 20˜

50 wt %;

50˜

80 wt %.

13. The method of claim 8, wherein the weight ratio (A:

B) between the blue afterglow luminescence material A and the yellow luminescence material B is 35˜

50 wt %;

50˜

65 wt %.

14. The method of claim 8, wherein the weight ratio (A:

B) between the blue afterglow luminescence material A and the yellow luminescence material B is 40˜

50 wt %;

50˜

60 wt %.

15. The method of claim 8, wherein the blue afterglow luminescence material A has a peak light-emitting wavelength of 440˜

490 nm.

16. The method of claim 8, wherein the yellow luminescence material B has a peak light-emitting wavelength of 520˜

580 nm.

17. The method of claim 8, wherein the blue afterglow luminescence material A comprises one or more materials selected from the group consisting of Sr₄Al₁₄O₂₅:

Eu²⁺,Dy³⁺, Sr₂MgSi₂O₇;

Eu²⁺,Dy³⁺, CaS;

Bi³⁺,Na⁺, CaS;

Cu⁺,Na⁺ and CaSrS;

Bi³⁺.

18. The method of claim 8, wherein the yellow luminescence material B comprises one or more materials selected from the group consisting of Y₂O₃.Al₂O₃.SiO₂:

Ce.B.Na.P, Y₃Al₅O₁₂;

Ce, Tb₃Al₅O₁₂;

Ce, Y₂O₂S;

Mg,Ti, Sr₃SiO₅;

Eu²⁺,Dy³⁺, Ca₂MgSi₂O₇;

Eu²⁺,Dy³⁺, CaS;

Sm³⁺, YAG;

Ce and TAG;

Ce.

19. The method of claim 8, wherein the yellow luminescence material B is a yellow luminescence material with or without an afterglow phenomenon, or a combination thereof.

20. The method of claim 8, wherein the blue afterglow luminescence material A comprises one or more materials selected from the group consisting of Sr₄Al₁₄O₂₅:

Eu²⁺,Dy³⁺, Sr₂MgSi₂O₇;

Eu²⁺,Dy³⁺, CaS;

Bi³⁺,Na⁺, CaS;

Cu⁺,Na⁺ and CaSrS;

Bi³⁺, and wherein the yellow luminescence material B comprises one or more materials selected from the group consisting of Y₂O₃.Al₂O₃.SiO₂;

Ce.B.Na.P, Y₃Al₅O₁₂;

Ce, Tb₃Al₅O₁₂;

Ce, Y₂O₂S;

Mg,Ti, Sr₃SiO₅;

Eu²⁺,Dy³⁺, Ca₂MgSi₂O₇;

Eu²⁺,Dy³⁺, CaS;

Sm³⁺, YAG;

Ce and TAG;

Ce.