Analysis: Reasons and solutions for causing energy-saving lighting to decay too quickly

1 Introduction

China is a large country producing compact fluorescent lamps, and its products occupy a large share in the international market. China has joined the WTO and further promoted the export of compact fluorescent lamps in China. Obviously, the technical barriers to exports will be high. We cannot be satisfied with the status quo, but we must innovate in technology to meet the international advanced level of products to occupy the international market.

2. Light decay mechanism of compact fluorescent lamps

For the compact fluorescent tubes produced in China, when the traditional organic coating liquid powder is used, the main reason for the light decay is that the nitrocellulose binder in the powder layer after the pre-formed glass tube is not completely baked in the baking tube stage. This will result in the formation of a black light absorbing film of carbon and oxidized mercury on the inner surface of the phosphor layer to color the powder layer (black); the second reason for the light decay is that the glass tube produced in China has a high sodium content, and Photodegradation is severe, mercury will penetrate into the glass during the life of the lamp, and the sodium in the glass diffuses to the powder layer, and forms a black sodium amalgam with mercury, which causes the phosphor particles to contaminate; the third reason It is the quality of the phosphor itself, the surface is heterogeneous, and it is easy to adsorb oxidized mercury and mercury.

3. The key process technology to overcome the light decay of the lamp

In view of several main reasons affecting the decline of compact fluorescent lighting in China, in addition to the use of ball-free rare earth phosphors with perfect crystallization, crystal integrity, smooth surface, no impurity phase and uniform particles, we have adopted the following process technologies to make The light decay of the lamp is reduced:

3.1. Using a new formula of water slurry coating process

For rare earth tribasic toners, we use a nonionic polymer, polyethylene oxide, as a temporary binder for the aqueous slurry coating process. The binder decomposes at a lower temperature and begins to decompose at 2000 C. After reaching the decomposition temperature, it decomposes from the polymer into monomers, and these monomers run off in a gaseous state. Therefore, the use of polyethylene oxide as a temporary binder can ensure that the formed glass tube is completely baked in the baking tube stage, and the glass tube is not deformed, which prevents the formation of the black light absorbing film layer on the phosphor layer. .

3.2, using protective film technology

In order to prevent the blackening of the glass tube and the thermal diffusion of sodium ions into the phosphor layer in the glass, for the high-wall-loaded compact fluorescent lamp (tube inner diameter 10mm, current greater than 0.2A), protective film technology should be used, that is, in the powder coating Before, apply a protective film layer. There are two kinds of protective film layers, one is a transparent oxide protective film layer; the other is a light-transmitting aluminum oxide protective film layer. The production practices of the relevant companies prove that both protective films have a protective effect. After the protective film technology, the glass tube is no longer blackened by the infiltration of mercury. The phosphor is no longer "colored" by the formation of sodium amalgam on its surface, and the lumen maintenance rate of the lamp for 2000h and 5000h is greatly improved.

3.3, optimization of the baking tube, cathode coating and exhaust process

After using polyethylene oxide as a binder, the baking tube process specification of the powder tube should be formulated according to the thermal decomposition characteristics of the polyethylene oxide to obtain an optimum binder-free powder layer. In order to obtain a long-life cathode, in addition to the quality of the electron-emitting material itself, attention should be paid to the consistency of the tungsten wire spiral cold resistance, the amount of the stored electron powder and its consistency; the cathode energization process during the exhaust should be reasonable, and should be vacuum The pumping rate of the system is matched to facilitate the formation of the intermediate layer of barium tungstate. The baking temperature should be high when exhausting, the time should be sufficient, and the purity of argon-filled gas should be high to ensure the lowest impurity gas pressure in the lamp tube, and obtain good cathode life and light decay characteristics.

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