Long-afterglow LED

Abstract

The invention provides a long-afterglow LED, which comprises an LED wafer (1), an accessory, a bracket (2), a light distribution inner lens (3) and a long-afterglow light-emitting lens body (4), wherein the LED wafer (1), the accessory and the bracket (2) are packaged in the transparent light distribution inner lens (3), the top of the light distribution inner lens (3) is an optical part with a light distribution emergent function, the long-afterglow light-emitting lens body (4) is an optical structure light-emitting forming body which is formed by mixing long-afterglow light-emitting powder and a light-transmitting mixed medium according to a proportion and performing liquid curing forming or molten curing forming, and a transparent light guide medium surrounds or partially surrounds the side wall of the light distribution inner lens (3) in a liquid curing mode or a molten curing mode or through a matched structure to form an LED whole with LED light distribution emergent and afterglow light emitting functions. According to the invention, the light energy distribution proportion can be adjusted, light distribution is carried out on an emergent light field, and at least part of emergent light of the LED luminous bodies can be designed to be emitted according to a light path while the advantages of afterglow luminescence are kept.

Description

technical field [0001] The invention relates to the field of light-emitting LEDs, in particular to a long afterglow LED. Background technique [0002] Long afterglow luminescent material is short for long afterglow material, also known as luminous material, which is a kind of photoluminescent material: under the excitation of light source, it emits visible light and stores part of the obtained light energy. After the excitation stops, it emits visible light in the form of light. The energy is released slowly, and its luminous brightness is related to the properties of the luminescent material itself, and also related to the thickness of the long-lasting luminescent layer and the concentration of the long-lasting luminescent powder; due to the continuous development and progress of electroluminescence excitation long-lasting technology, long-lasting materials The luminous brightness has been greatly improved. In recent years, it has been gradually paid attention to and applie...

AI Technical Summary

Problems solved by technology

[0004] 1. For the existing long afterglow LED, the long afterglow LED is set on the top or fully covered on the lamp bead. Since the LED is generally a Lambertian body, the closer to the main optical axis, the greater the luminous intensity, so most of the LED The outgoing light exits from the top of the lamp bead. Due to the absorption and scattering of the long afterglow luminescent powder, the outgoing light energy loss is too large when the LED emits light, especially the LED beam angle is too large, and the light distribution effect such as focusing and long-range shooting cannot be achieved.

[0005] 2. The outgoing light is the composite luminescence of LED luminescence and long-lasting excited light, so there is a hue drift, which has a great influence on the original LED spectrum

[0006] 3. Because the light intensity near the LED is very high, which far exceeds the intensity of saturation excitation required by the long afterglow material, unnecessary light energy is wasted, and the overall luminous efficiency of the LED is low, which greatly affects its performance

[0007] 4. When multi-chip LED or single LED multi-color light is used to emit light, the color light that is not in the long afterglow excitation spectrum range is affected by the shading of the long afterglow illuminant, resulting in waste of light energy

[0008] In short, the long afterglow LED of the prior art has the above-mentioned fatal defects and some other shortcomings, which restrict its development and become a difficult problem to be solved urgently in the industry.

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