Preparation method of blue/purple long-distance triggered LED (Light Emitting Diode) white-light emitting illumination material

Abstract

The invention belongs to the technical field of light-emitting materials and in particular relates to a preparation method of a blue / purple long-distance triggered LED (Light Emitting Diode) white-light emitting illumination material. The preparation method comprises the following steps of: mixing liquid-state polyurethane, an organic solvent and a defoaming agent, then adding florescent powder and stirring for 0.2-2 hours; and coating stirred paste onto a pretreated transparent plate and drying the transparent plate, wherein the organic solvent is butyl acetate, the defoaming agent is an organic siloxane defoaming agent, the paste is coated on the transparent plate by adopting one or more of steps, such as spin coating, dropwise coating, brush coating and spray coating, and the thickness of the coating is 0.2-0.6mm. The fluorescent powder used in the process of preparing the light emitting material by using the preparation method is not in direct contact with a chip, thereby being long in service life; the color temperature of the florescent powder can be adjusted between 3000K and 8500K; and in addition, a packaging process is simple and flexible. According to the preparation method, the use amount of the florescent powder is low, the raw material is easily available and non-toxic, and no industrial three wastes are formed in the preparation process. The light emitting material is wide in application field.

Description

technical field [0001] The invention belongs to the technical field of luminescent materials, and in particular relates to a preparation method of blue / purple light remote excitation LED white light illumination luminescent materials. Background technique [0002] Compared with traditional lighting sources, white LEDs have many advantages, such as: small size, low energy consumption, fast response, long life, no pollution, etc., so they are called the fourth generation of lighting sources. At present, traditional commercialized LEDs are dot-coated with phosphor powder on LED chips to emit white light. However, the traditional packaging method has the following problems: the phosphor must be in direct contact with the chip, and the operating temperature of the chip often reaches 200°C, which will cause temperature quenching of the phosphor at high temperature, and the temperature quenching will cause the fluorescence The luminous efficiency of the powder decreases, which lea...

AI Technical Summary

Problems solved by technology

However, the traditional packaging method has the following problems: the phosphor must be in direct contact with the chip, and the operating temperature of the chip often reaches 200°C, which will cause temperature quenching of the phosphor at high temperature, and the temperature quenching will cause the fluorescence The luminous efficiency of the powder decreases, which leads to the phenomenon of "color drift" during the use of white LEDs; the direct contact between the chip and the phosphor also limits the application range of the phosphor, such as some classic sulfide phosphors such as: CaS:Eu 2+ , SrS:Eu 2+ can't apply

However, the current packaging method for remote excitation is not perfect, and there are mainly problems such as high cost, large amount of phosphor powder, and inflexible packaging methods.

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