The hottest LED wafer laser engraving technology

2022-08-10
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LED wafer laser engraving technology

I. lighting uses LED light sources to illuminate the future

the negative effects such as global warming caused by the greenhouse effect have contributed to the rise of the worldwide green energy conservation movement. In terms of lighting, the world continues to seek more efficient and energy-saving light sources as a substitute for traditional lighting sources. LED light sources are the best choice, followed by the continuous and rapid expansion of the application of high brightness LED in the field of lighting in recent years. The introduction of laser wafer engraving technology in LED manufacturing makes led widely used in LCD backlighting, such as, TV and touch screen, and the most exciting is the application of white LED in lighting

in today's world, there are about 12billion white objects that shape the required shape or suitable tightening force through plastic deformation. Incandescent lamps are still in use, generating about 40000 trillion lumen hours of lighting every year, which causes huge energy consumption, equivalent to nearly 1billion tons of coal consumption every year. Take the United States for example, the energy consumption of lighting is as high as half of the national automobile energy consumption. According to the recent investigation of Oregon home lighting by the U.S. Department of energy, led as a lighting source saves about 80% of electric energy compared with traditional incandescent lamps and halogen lamps

with the continuous growth of the market, the requirements of LED manufacturing industry for production capacity and yield become higher and higher. Laser processing technology has quickly become a common tool in LED manufacturing industry, and even an industrial standard for high brightness LED wafer processing

laser marking led marking lines are much narrower than traditional mechanical marking, so the material utilization rate is significantly improved, so the output efficiency is improved. In addition, laser processing is a non-contact process, which brings less wafer microcracks and other damage, which makes the wafer particles closer, with high output efficiency and productivity. At the same time, the reliability of finished LED devices is also greatly improved

spectrum physics industrial laser has the advantages of peak power and excellent beam quality. It is an ideal tool for LED processing. It brings clean scribed lines, higher production capacity and higher brightness of finished led to the LED industry. "To achieve this goal, high brightness should be achieved."

advantages of laser engraving

- it can engrave hard and brittle materials cleanly and neatly

- non-contact process with low operating cost

- reduce the occurrence of defects such as edge collapse, microcracks, delamination

- narrow engraving lines improve the number of particles on a single wafer

- reduce microcracks and improve the long-term reliability of finished LED devices

- a wide range of processing tolerance makes the process controllable, It is a process with low cost and high reliability

II. Overview of LED laser engraving

single crystal sapphire (sapphire) and gallium nitride (GAN) are hard and brittle materials (tensile strength close to steel), so it is difficult to be cut into single LED devices. When cutting these materials with traditional mechanical saw blades, it is easy to cause damage such as wafer edge collapse, microcracks and delamination. Therefore, when cutting LED wafers with saw blades, a wide width must be reserved between the monomers to avoid cutting cracks and damaging LED devices, which greatly reduces the output efficiency of LED wafers

laser processing is a non-contact processing. As an alternative process to traditional mechanical saw blade cutting, the laser cutting cut is very small. The focused laser micro spot acts on the wafer surface to quickly vaporize the material, making a very small cut between the LED active areas, so that more LED monomers can be cut on the wafer with a limited area. Laser engraving is especially good at gallium arsenide (GaAs) and other brittle compound semiconductor wafer materials. For laser processing of LED wafers, the typical scoring depth is 1/3 to 1/2 of the substrate thickness. In this way, a clean fracture surface can be obtained by segmentation, and narrow and deep laser scoring cracks can be manufactured. At the same time, the high-speed scoring speed should be guaranteed. This requires the laser to have narrow pulse width, high beam quality, peak power, high repetition rate and other excellent qualities

not all lasers are suitable for LED marking, because of the transmissibility of wafer materials to visible wavelength lasers. Gan transmits light with wavelength less than 365nm according to different uses, while sapphire wafer semi transmits laser with wavelength greater than 177nm. Therefore, triple and quadruple frequency Q-switched all solid state laser (DPSSL) with wavelength of 355nm and 266nm is the best choice for LED wafer laser marking. Although the excimer laser can also achieve the wavelength required for LED marking, the frequency doubled all solid-state Q-switched laser has smaller volume and much less maintenance than the excimer laser. In terms of quality, the marking line of the all solid-state laser is very narrow, which is more suitable for laser led marking

laser engraving greatly reduces the microcrack and microcrack expansion of the wafer, and the distance between LED monomers is closer, which not only improves the production efficiency, but also improves the production capacity. Generally speaking, more than 20000 led monomers can be separated from a 2-inch wafer. Such a high density will significantly affect the number of granulations. Reducing microcracks will also significantly improve the long-term reliability of the granulating LED devices. Compared with traditional blade cutting, laser engraving not only improves the output efficiency, but also improves the processing speed and avoids the processing defects and cost losses caused by blade wear. In short, laser processing has high precision, large processing tolerance and low cost

key market requirements for DPSS all solid state lasers

- high reliability

- long continuous operation time

- Laser led engraving process with optimized one key on parameters

-- 266nm all solid state laser for LED wafer front engraving

-- 355nm for back engraving

- global service, technical support network

- short pulse width high peak power to achieve deep engraving, Minimize thermal damage

- high quality beam quality to achieve the minimum scribe width

- laser suppliers have strong application development strength and experience led laser scribe spectrum Physics (spectral Physics) laser selection

III. spectrum - it can also detect the name of building materials and products. Physics (spectral Physics) laser overview

for a long time, Spectrum physics has always been regarded as the global customer service leader in the field of laser technology. With 50 years of development, spectrum physics has designed, developed and manufactured a series of the world's first commercial lasers for the industrial market, including lasers for LED laser engraving

generally speaking, the advantages of laser for LED engraving are clear, but it also faces many technical challenges, such as the differences brought by different materials, thicknesses, and engraving speeds in different cases. For this purpose, spectrum physics provides a number of series of laser products for laser engraving and granulation, and is a leader in industrial processing in this field. It constantly introduces innovative high-precision lasers, such as Tristar TM, navigator TM, hippotm and other series of high-power nanosecond lasers, as well as vanguard TM series picosecond lasers. If femtosecond laser is needed, spectral physical solstice laser can provide 100fs fully automatic femtosecond pulse laser. The product is designed for industrial applications, solid and reliable

when the spectral physical laser with short pulse and high peak power acts on the LED substrate marking, the effect is: the marking line is clean, the material position moves little, and the thermal effect damage to the substrate is very small. Spectrum physics provides you with deeper applied knowledge and experience to help your process achieve the best results

our technology, experience and innovative spirit make our lasers outstanding. The ProLite diode pump source used in the spectral physical all solid state laser has a leading position in the industry, and its service life is twice that of its competitors. In addition, the spectral physical eternalign TM optical device mounting technology ensures good internal and external optical alignment during the whole life of the laser

spectrum physics unique out of cavity frequency doubling technology is the highest quality in all solid state Q laser. In addition, key laser components such as pump diodes, optical fibers, shutters, output windows, etc. can be easily repaired and replaced on site, which makes the continuous operation time and average maintenance time (MTTR) of spectral physical all solid state lasers double, and your use and maintenance costs will be minimized. Behind every spectral physical laser supplied to you is the firm confidence and guarantee of Newport global laser to serve the technical support team

spectrum physics spectrum - advantages of physical lasers

- long continuous working time - derived from the high reliability of products Excellent design and technical support

- pump diode life - twice the average life of industrial laser pump diode

- Technical Support - global technical support after-sales service network provides high-quality service for large-scale installation

- market validation - tens of thousands of installed spectral physical lasers have proved the excellent working performance of lasers in 24/7 industrial use

- short pulse width - means higher peak power and minimized heat affected area

- nearly perfect beam quality - narrower scoring width

- better pulse pulse energy stability - to achieve higher precision scoring depth control

- successful experience - a wide range of successful cases in the world, spectrum physics' leading laser application laboratory, It can master the process requirements of your existing materials in the shortest time, and provide you with the best laser engraving solution

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