UV LED Optical Application

release time：2021-08-01

3535 light source glass package lens

The transmittance of the packaging material on the chip exit path in the UV band directly affects the light output of the UV LED. The higher the transmittance of the material in the UV band, the higher the light output of the UV LED. Because of the different properties of the material, the transmittance of different materials in the same UV band will vary greatly. The initial transmittance of organosilica (methyl silica gel and phenyl silica gel) has no advantage over glass at all wavelengths throughout the UV range. Moreover, as the wavelength decreases, the initial transmittance of the organic silica gel and the glass will drop to varying degrees, and the initial transmittance of the organic material decreases more rapidly than the glass. At 300 nm, the initial transmittance of methyl silicone gel is already less than 85%, which has a great influence on the light output of the chip, so Methyl silicone gel is not suitable for the ultraviolet band with a lower band. In addition, after the organic silica gel and the glass were exposed to UV light of 365 nm for 24 hours, the transmittance of the organic silica gel in the UV band was greatly lowered, and the transmittance of the glass was substantially unchanged. In the ultraviolet range, the initial transmittance of the glass and the transmittance after UV aging are superior to those of the organic silica gel.

Herculux has more than ten years of experience in design and mass production of ultra-violet high-transmitting optical glass. Today we share a design case of a UV LED 3535 packaged precision glass lens.

Design objective

1. Encapsulated lens material: UV high permeability glass

2. Chip: 45mil * 45mil UV light source (simulated using wavelength 365 light source)

3. Optical requirements: As much light as possible to shoot out the LED

Lens analysis

Comparison and analysis of the original lens and Herculux new design lens structure:

Comparison and analysis of the original lens and Herculux new design lens distribution curve:

The original lens and Herculux new design lens spot map analysis comparison:

The original lens is compared with Herculux new design lens material: the new package is made of inorganic material and has good weather resistance.

Contrast result

Application

Optical Solutions for UV Offset Printing

UV offset printing has been widely used in packaging printing, publishing and commercial printing because of its strong adaptability, high stability, good product quality, fast curing speed, saving time and energy. UV printing requires UV ink, and the drying method is UV curing. This is different from ordinary inks, which means that finishing printing also means drying out the printed matter, which can eliminate many disadvantages such as dirty gifts caused by slow drying of ordinary inks. UV offset printing has the advantages of more suitable printing materials, good friction resistance and solvent resistance, and also can bring rich and colorful performance finishing effect.

The rapid drying of UV offset printing requires the assistance of UV curing device. With the development of science and technology, enterprises pay more and more attention to energy saving and environmental protection. With the emergence of UV-LED curing lamps with more accurate measurement, higher temperature resistance, longer service life and more energy-saving and environmental protection, the traditional high-pressure mercury lamp will be gradually replaced by UV offset printing.

Herculux has been developed in the field of UV LED for many years, and has successfully provided UV offset printing optical solutions for many printing enterprises. Today we will share an example of an optical scheme for UV offset printing.