Today's LEDs are found in every corner of the city, from lighting and display to automotive equipment. But there is also market feedback, the brightness of LED lights will slowly decrease, why? It is understood that the reason is: silver will be used in the LED production process, but there will be many vulcanization in the market environment, such as automobile exhaust, gasoline, electronic cigarettes, rubber, hot springs, etc., when sulfur encounters silver The reaction is silver sulfide, and the color becomes black, which causes a decrease in the brightness of the LED light. In response to this challenge, ROHM, the world's leading semiconductor manufacturer, recently released the industry's first silver-free high-brightness red LED "SML-Y18U2T" for the automotive industry, which is suitable for harsh environments such as automotive brake lights.
Mr. Yoshida Akira, head of the product planning group of the LED manufacturing department of the ROHM semiconductor module, Mr. Sugawara, the deputy director of the design center of Roma Semiconductor (Shanghai) Co., Ltd., and the media presenting a new generation of LED products and the overview of Roma Semiconductor Made a detailed sharing.
Figure 1: Mr. Yoshida Akira, Head of Commodity Planning Group, LED Manufacturing Division, ROHM Semiconductor Optical Module Manufacturing
Figure 2: Mr. Suwon Dejian, Deputy Director of Design Center of Roma Semiconductor (Shanghai) Co., Ltd.
Mr. Yoshida further illustrated the location where vulcanization may occur with a picture. As shown in the figure below, the cross-section of the product, the position of 1 is the chip, the silver paste (2 position) is used when the chip and the bottom are soldered, and the silver plating is used in the periphery. The LED chip emits light from two directions, one of which is normally emitting light from above, and the other is reflecting light from the side. If the side is vulcanized and blackened, the reflected light will be reduced, so the brightness we see will be lower and lower. To sum up, these three positions may cause vulcanization. The silver mirror layer in one chip may cause poor component characteristics due to vulcanization. 2 silver paste, the brightness after vulcanization decreases, and then the bond is peeled off. 3 silver plated frame is vulcanized and gold wire Secondary bonding peeling.
Figure 3: Location where vulcanization may occur
How does Narom overcome the above problems and resist vulcanization? Mr. Yoshida said: "We made a change in the material. First, replace the original silver paste with gold tin on the chip key; in fact, the frame becomes copper framed gold; the lead continues to use the original gold wire; Sealing resin, heat-resistant and light-resistant materials, this gave birth to a completely silver-free LED product." He added that this chip package is the PLCC4 3.5*2.8mm commonly used in the car. This time, the SML-Y18U2T chip has a red LED with a wavelength of 612-624 nm.
Figure 4: New product structure and component picking
ROHM has proven its new products with higher reliability through 10 cycles of intensive testing. Through the vulcanization test, using hydrogen sulfide 8ppm, the environment is 25 ° C 60% humidity, from 5 hours to 60 ° C 95% humidity and then run for 5 hours ..., 24 hours per cycle, a total of 10 cycles, The results are as follows:
Table 1: Test comparison results
Figure 5: Comparison of LED luminous flux during test cycle
The SML-Y18U2T is initially designed for brake lights such as automobiles and motorcycles. It is expected to be mass-produced next year, first in the Japanese car factory. In addition, there is a large demand for this product in the domestic industrial control and outdoor fields.
ROHM LED product development historyTime flies, looking back from the establishment of the Toyo Electric Manufacturing Co., Ltd. in 1958 (now Rom Semiconductor), Roma Semiconductor has gone through 60 years of history.
The development of LED alone, from the birth of the first LED lamp in 1973 to the launch of anti-vulcanization silver-free LED today, has also undergone 45 years of technical precipitation and industry experience. In the meantime, the company used innovative ideas to increase the promotion of new products. In 1996, Roma began to produce SMD LEDs. In 2002, it produced blue SMD LEDs. In 2007, PICOLEDs, namely ultra-small and thin LEDs, were launched in 2009. , thin RGB, 2013 production of lens surface mount LED, 2016, with mirror ultra-small high-brightness RGB began production, in 2017 launched the industry standard 1608 product lineup.
The two production bases of Roma are the headquarters (Kyoto) and Shizuoka, respectively. The difference is that Kyoto produces chips mainly; Shizuoka produces some special products. There are three places in the package. Okayama is mainly responsible for the production and production management of new products; mass production is distributed in Tianjin and Malaysia in China. The anti-vulcanization LED released today is produced in JD.com and is produced in Malay West.
Roma's advantage
Compared with other LED companies, ROHM is more focused on the development of ultra-small, thin and light LEDs, and always puts quality management at the forefront, such as: Roma is easier to assemble in the chip design; focus on ultra-small products R & D and production, at the same time can carry out traceability system; in addition, we all know that the quality requirements of vehicle-grade products are very strict, although the consumer products Roma also uses the car quality and the corresponding process management system, Mr. Suwon introduced.
Another advantage of ROHM is that its vertical integration production system, from wafer to package consistent production system, can better control the price, production process and production management.
Four LED product featuresMiniaturization: The market demand for miniaturized and thin LED products. ROHM has made the products small in three aspects, small in package, small in chip size, and the 0.2 mm industry's thinnest height through the loop of reducing money.
Single brightness level: ROHM will subdivide the brightness of ABCD, red, blue, yellow and white, from red orange, yellow, green, blue and purple to 17 colors in the general market.
General Color: As we all know, each person's recognition of color varies with color perception. The common color perception and color weakness are different for color recognition. Roma will make a special color segment for the weak person to recognize.
ROHM has a very rich lineup of LED products that can be applied to consumer, lighting, automotive and industrial control applications.
When it comes to sales share, from 2017, ROHM's industrial equipment accounts for 26.8% of total sales, automobiles (including audio and navigation accounts for 18.3%), and others are numerous consumer electronics. From the automotive segment, the key markets are audio, navigation, display panels, instrument panels and taillights. From the point of view of industrial equipment, the indicator light, the 7-speed display, and the sensor light source, Roma has an advantage. The main sales share in the field of consumer electronics, communications, and office equipment is: indicator lights for various entertainment products, dot matrix display, and function display.
Summary: LED industry development, market demand for diversified products, LED technology continues to innovate, Roma is not a giant in the LED industry, but with its technical expertise in the semiconductor industry, and focus on miniaturization, thin The innovative and innovative product features, as well as the company's pursuit of high quality and vertical integration production system, always bring new breakthroughs to the market. In addition, China's demand for LEDs is increasing year by year, which also provides a favorable opportunity for the growth of Roma business.
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