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Low light attenuation fluorescent lamp

A fluorescent lamp and light decay technology, applied in the field of lighting, can solve the problems of high brightness and light decay, aging, and reduced luminous efficiency, and achieve the effects of reduced mercury consumption, stable performance, and low light decay.

Inactive Publication Date: 2011-06-15
毛有强
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

Young2Rag Do et al. used the solvent-gel method to coat silicon oxide and aluminum oxide in the blue powder phosphor excited by vacuum ultraviolet rays. In order to reduce the absorption of ultraviolet rays, the film thickness was controlled within 10nm, and the coating was treated at 600°C. The brightness of the blue phosphor is 25% higher than that of the uncoated blue phosphor, but the disadvantage of this method is that the film layer is too thin to maintain the brightness for a long time due to the impact of ionization and vacuum ultraviolet rays during the working process.
In order to suppress the blackening of fluorescent lamps and increase the secondary electron emission rate of the electrodes, the invention with application number CN200610160936.6 discloses a sol-gel film-forming process to solve the problem of small diameter fluorescent lamps such as CCFL (cold cathode fluorescent lamp) or EEFL ( The problem of film formation on external electrode fluorescent lamps: at least one of the precursors of magnesium oxide, calcium oxide, strontium oxide, and barium oxide is fired and decomposed to form a film, and the size of the metal oxide particles obtained after firing is required to be 10nm -100 μm, preferably 100nm-50 μm, the thickness of the film is approximately equal to the thickness of the fluorescent layer (note: generally 5-50 μm), preferably 100nm-10 μm, according to this method, the above-mentioned metal oxide precursor is used as the substrate in the fluorescent layer. A metal oxide film with a thickness of 100nm was made on the powder layer, and it was found that the oxide film actually became an ultraviolet reflection and absorption film. The ultraviolet rays were continuously reflected and absorbed in the film layer, resulting in a large energy loss and a decrease in the brightness of the lamp. Unacceptable; In addition, according to this method to make a matrix film with a particle size of 10nm, it is found that a relatively high proportion of lamp brightness will also be reduced due to enhanced ultraviolet reflection. Therefore, the combination of the above two aspects makes this scheme effective in isolating high-speed ions and fluorescent light. Layers are even less practical
[0003] In fluorescent lamps with mercury, mercury is excited to emit ultraviolet rays of 254nm and 185nm. Due to the high energy of vacuum ultraviolet rays with a wavelength of 185nm, they will damage the crystal structure of phosphors. Similarly, phosphors are in a high-speed ion impact environment for a long time. In the middle, it will also cause the crystal structure of the phosphor to be destroyed and aged, which are the reasons for the large brightness and light decay of the lamp
Especially in high-power fluorescent lamp lighting places with sealed lamps, such as street lighting and ceiling lighting, since the phosphor powder works in a high-temperature environment, the reduction in luminous efficiency due to high temperature is more serious

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preparation example Construction

[0031] The preparation process of the low light attenuation fluorescent lamp in the embodiment is generally:

[0032] Coat a layer of protective film on the inner wall of the clean glass glass tube to isolate the sodium plasma in the glass tube from infiltrating the phosphor powder and mercury to form a sodium amalgam alloy. Coat a layer of phosphor powder on the dry protective film and dry Then coat the plasma isolation film on the phosphor layer. The plasma isolation film can be composed of several layers of films of different materials to form a composite film. The plasma isolation film isolates the phosphor layer from the inert gas. Spraying method, immersion method, material suction method or the method of flushing the fluid inside the glass tube can be used as the coating method, and the electrostatic coating method can also be used as the coating method, and the dispersion fluid is coated on the phosphor layer and carried out. Bake to obtain a plasma isolation film.

Embodiment 1

[0036] Nano-calcium fluoride particles (5nm) were made into dispersion fluid with isopropanol.

[0037] After the glass tube is baked to remove impurities and cleaned, first coat the inner wall of the glass tube with an aluminum oxide protective film layer, and then coat the phosphor layer on the protective film layer after drying. After the phosphor layer is dry, apply the coating method The dispersion fluid is coated on the phosphor layer and baked to obtain a plasma isolation film.

[0038] The thickness of the plasma isolation film layer can be controlled by controlling the weight ratio of calcium fluoride in the dispersion fluid and the flow velocity of the dispersion fluid, and the thickness of the plasma isolation film layer is controlled at 25nm.

[0039] After baking, electrodes are set in the glass tube, electronic powder is decomposed, mercury is sealed, exhausted, inert gas is sealed, and the cold end of the glass tube is sealed to make the low light decay fluoresc...

Embodiment 2

[0041] 1.0 g of boric acid was placed in 100 ml of commercial nanoscale alumina solution at 70° C. to prepare an aluminum borate salt solution.

[0042] After the glass tube is cleaned by removing impurities from the baking tube, first coat the aluminum oxide protective film layer on the inner wall of the glass, and then coat the phosphor layer on the protective film layer after drying. After the phosphor layer is dried, the prepared aluminum borate The salt solution is coated on the dry fluorescent powder layer, filtered and dried, and baked to obtain an aluminum borate plasma isolation film layer. The thickness of the plasma isolation film layer is controlled at 25nm.

[0043] After baking, electrodes are set in the glass tube, electronic powder is decomposed, mercury is sealed, exhausted, inert gas is sealed, and the cold end of the glass tube is sealed to make the low light decay fluorescent lamp of this embodiment.

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Abstract

The invention belongs to illumination field and particularly relates to a low light attenuation fluorescent lamp which comprises a glass tube. Inert gas is filled in the glass tube; the inner wall of the glass tube is coated with a protective film layer; a fluorescent powder layer is coated on the protective film layer; and a plasma isolating membrane layer with the thickness of 5-100nm is coated on the fluorescent powder layer, wherein component materials of the plasma isolating membrane are selected from at least one of nano-oxides, nano-fluorides, nano oxysalts, latex or polysiloxane, or surfactant and wax materials. Through the arrangement of the plasma isolating membrane layer between the fluorescent powder layer and the inert gas, the fluorescent powders and high-speed plasmas can be effectively isolated, the losses of ultraviolet rays at 257nm are small, the property of the fluorescent powders is more stable, the luminous efficiency is higher, and the service life is longer.

Description

technical field [0001] The invention belongs to the field of illumination, and specifically relates to a fluorescent lamp, more specifically, provides a fluorescent lamp with reduced light energy attenuation, and includes a fluorescent lamp in which vacuum ultraviolet rays excite fluorescent powder to emit light. Background technique [0002] The following two reasons will cause the attenuation of fluorescent lamps: one is that the solvent needs to be removed at high temperature during the lamp making process, which may cause EU 2+ oxidized to EU 3+ , The second is the attenuation of vacuum ultraviolet rays and ion sputtering during lamp work. The reason is that the surface that was originally a crystal becomes an amorphous surface with a thickness of 5-20nm. Due to the shallow penetration of ultraviolet rays, this non-luminous amorphous surface will resulting in a decrease in luminance. Moreover, the performance of phosphors, especially blue powder and green powder, is un...

Claims

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Application Information

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IPC IPC(8): H01J61/35C03C17/34
Inventor 毛有强
Owner 毛有强