How to use additives to improve the brightness of the lampshade of LED lamps
At present, energy-saving and environmentally friendly lamps are becoming more and more popular, and more and more people pay attention to the development of LED lamp cover materials. These lamp cover materials include PC (polycarbon), PMMA (acrylic), etc. How can it be achieved that the LED light is not dazzling, and can increase the brightness of the LED light? That is the light diffusing agent that everyone often talks about. This light diffusing agent can achieve the softness of the LED light by changing the propagation direction of the light multiple times in the substrate, and at the same time, it can also improve the simple use of color powder To adjust the lack of light glare, because the toner will block a lot of light in the substrate, making the brightness darker, and it cannot block a lot of light passing through like the use of organic light diffusers.
Does any light diffusing agent make LED optical material will not affect the brightness (light transmittance)?
We can analyze this from the light diffusing agents currently used. The current light diffusing agents are:
Inorganic light diffusers and organic light diffusers.
Inorganic light diffusing agents mainly include: nano barium sulfate, calcium carbonate, silicon dioxide, etc. These inorganic light diffusing agents and inorganic light diffusing agents are solid microbeads from a microscopic point of view, and light cannot pass through this solid The sphere will affect the transmission of a lot of light, and only part of the light will pass through refraction, thus affecting the brightness or light transmission. At present, if the light transmittance of lampshade is above 50%, inorganic light diffusing agent cannot be selected.
Organic light diffusing agents mainly include acrylic type, styrene type, acrylic resin type, etc. These resins are transparent or translucent, and most of the light can pass through. Due to the difference in refractive index, after the light is refracted multiple times, the light passing through the substrate becomes bright and soft, and has little effect on the light transmittance of the material. It is a good choice for optical materials such as lamp shades.
It can be seen from the above analysis that the organic light diffusing agent is the light diffusing agent S for the lampshade material of the base material such as PC and acrylic. Because there are different types of organic light diffusing agents, and their materials themselves have different refractive indices of light, there are different classifications of light diffusing agents for PC lamp shades and light diffusing agents for PMMA lamp shades.
Why does the organic light diffusing agent make the optical material of the LED tube lampshade not affect the brightness too much?
The current mechanical light diffusing agent nano-beads, the material itself can transmit light, which solves the problem of uniform light and light transmission. After many times of light refraction, a soft light effect is achieved, and the loss of light transmission energy is less. This organic nano-particle is a kind of small transparent sphere, which is added to PC, PMMA, PVC, and potting glue, and can be evenly dispersed in the resin. The incident light passes through the glass sphere and passes through the glass body countless times. refraction, and then penetrate. Such intense light is refracted and evenly dispersed. The point light source is turned into a surface light source, which expands the light-emitting surface, and makes the light very soft. At the same time, the light can penetrate the glass sphere, so the loss of light is very small, and it also plays the role of uniform light and light transmission.
If PC optical materials want to achieve light diffusing effect and have better haze, how to choose light diffusing agent?
The selection of light diffusing agent should pay attention to the following aspects
1. Choose a multi-component light diffusing agent. The size of the multi-component light diffusing agent is different, which can better make the light multiple times and has a good haze. The haze of the single-component light diffusing agent is not as good as that of the multi-component light diffusing agent, but the light transmittance of the single-component light diffusing agent is better.
2. The refractive index of the selected light diffusing agent material should be different from the refractive index of the base material, but the difference should not be too large. Too large a difference will lead to the occurrence of total reflection, which will not meet the requirements of light diffusion and transmission.
3. To make high-quality PC or PMMA optical materials, the light diffusion should choose a type of light diffusing agent, so that the light coverage is serious, and the high light transmittance cannot be achieved, which affects the actual needs.
