Rare earth trichromatic color luminous powder

Among the rare earth trichromatic color phosphors, the red powder is yttrium activated yttrium oxide (Y2O3:Eu), the green powder is lanthanum and cerium activated aluminate (MgAl11O19:Ce, Tb), and the blue powder is low 铕activated aluminate Barium magnesium (BaMg2Al16O27: Eu). The three kinds of powders can be mixed in a certain ratio to obtain different color temperatures (2700-6500K), and the corresponding lamps can have a luminous efficiency of 80-100 lm/W and a color rendering index of 85-90. In general, the higher the green powder content and the lower the blue powder content, the higher the luminous efficiency of the lamp. In addition, the blue powder increases and the color temperature increases; the red powder increases and the color temperature decreases.

The matrix and activator of the three primary color powders are different, but the key to the luminescence is the rare earth activator (铕, 铈, 铽, etc.), which emits light by using the transition of the rare earth metal outer layer ions (D→F).

The trichromatic fluorescent lamp using the rare earth trichromatic color phosphor itself has many outstanding advantages. However, the rare earth raw material is expensive, resulting in a high cost of the trichromatic lamp, which limits the development of the trichromatic lamp. Reduce the diameter of the pipe or use a new coating technology to reduce the amount of three primary toners, and replace one or two rare earth tribasic toners with cheap other colored powders, and also produce high-efficiency, high-color fluorescent lamps, but light The decline may be a little bigger.