Fluorescent lamp and manufacturing method thereof

Abstract

A method of manufacturing a fluorescent lamp is provided. One of a dispersed metal oxide precursor sol prepared by a sol-gel reaction and a fluorescent substance slurry is coated on a glass tube having at least one open side and then the other of the fluorescent substance slurry and the dispersed metal oxide precursor sol is coated on the glass tube. Next, passivation and fluorescent layers are simultaneously formed by baking the coated layers. Then, air is exhausted out of the glass tube and a discharge gas is injected into the glass tube. Finally, the glass tube is sealed.

Description

BRIEF DESCRIPTION OF THE DRAWING

A more complete appreciation of the invention, and many of the attendant advantages thereof, will be readily apparent as the same becomes better understood by reference to the following detailed description when considered in conjunction with the accompanying drawings.

FIG. 1 is a side sectional view of an EEFL according to a first embodiment of the present invention.

FIG. 2 is a flowchart illustrating a method of manufacturing the EEFL of FIG. 1.

FIG. 3 is a cross-sectional view of an EEFL according to a second embodiment of the present invention.

FIG. 4 is a flowchart illustrating a method of manufacturing the EEFL of FIG. 3.

FIG. 5 is a side sectional view of an EEFL according to a third embodiment of the present invention.

FIG. 6 is a flowchart illustrating a method of manufacturing the EEFL of FIG. 5.

FIG. 7 is a side sectional view of an EEFL according to a fourth embodiment of the present invention.

FIG. 8 is a flowchart illustrating a method of manufacturing the EEFL of FIG. 7.

FIG. 9 is a side sectional view of an EEFL according to a fifth embodiment of the present invention.

FIG. 10 is a flowchart illustrating a method of manufacturing the EEFL of FIG. 9.

Claims

1. A method of manufacturing a fluorescent lamp, comprising: coating one of a dispersed metal oxide precursor sol prepared by a sol-gel reaction and a fluorescent substance slurry on a glass tube having at least one open side;coating the other of the fluorescent substance slurry and the dispersed metal oxide precursor sol on the glass tube;forming passivation and fluorescent layers simultaneously by baking the coated layers;exhausting air out of the glass tube; andinjecting gas into the glass tube and sealing the glass tube.

2. The method of claim 1, wherein the metal oxide precursor is an alkoxide or a nitrate including metal selected from the group consisting of Mg, Ca, Sr, Ba, and a combination thereof.

3. The method of claim 1, wherein a concentration of the dispersed metal oxide precursor sol is within a range of 0.1-70%.

4. The method of claim 1, wherein the coating of the two layers is conducted through a process selected from the group consisting of dip coating, roll coating, blade coating, slit coating, and spray coating processes.

5. The method of claim 1, wherein the baking of the coated layers is conducted at a temperature within a range of 350-600° C.

6. The method of claim 1, wherein the dispersed metal oxide precursor sol is deposited on an entire surface of an inner wall of the glass tube, or on regions of the inner wall of the glass tube that correspond to a length of the electrodes.

7. The method of claim 1, wherein the dispersed metal oxide precursor sol comprises an additive selected from the group consisting of a mercury abatement inhibitor, a dark property enhancer, and a combination thereof.

8. The method of claim 7, wherein the mercury abatement inhibitor is a metal oxide selected from the group consisting of Y2O3, CeO2, Al2O3, and a combination thereof.

9. The method of claim 7, wherein the dark property enhancer is Cs or a compound selected from the group consisting of CsO2, Cs2O, Cs2O2, Cs2SO4, Cs(OH)2, and a combination thereof.

10. The method of claim 7, wherein, in the metal oxide precursor sol, the additive is 1.0-90 parts by weight per 100 parts by weight of solid content.

11. A fluorescent lamp manufactured by the method of claim 1, equipped with passivation layer and fluorescent layer.

12. The fluorescent lamp of claim 11, wherein the passivation layer is disposed between the fluorescent layer and the glass tube, on the fluorescent layer formed on the glass tube, or on regions of the glass tube that correspond to the electrode.

13. The fluorescent lamp of claim 11, wherein the passivation layer comprises a metal oxide selected from the group consisting of MgO, CaO, SrO, BaO, a combination thereof.

14. The fluorescent lamp of claim 11, wherein a particle size of the metal oxide in the passivation layer is within a range of 0.001-100.

15. The fluorescent lamp of claim 11, wherein a thickness of the passivation layer is with in a range of 0.1-10.

16. The fluorescent lamp of claim 11, wherein the fluorescent lamp is one selected from the group consisting of a cold cathode fluorescent lamp (CCFL), an external electrode fluorescent lamp (EEFL), and a flat fluorescent lamp (FFL).