Ultra-Compact Low Profile 2-Color Chip LEDs-Ameya360电子元器件采购网

Ultra-Compact Low Profile 2-Color Chip LEDs

发布时间：2017-09-07 00:00

作者：Ameya360

来源：Ameya360

阅读量：8530

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　　Kyoto and Santa Clara, Calif., – August 24, 2017 – ROHM has recently announced the availability of the industry's smallest class (1608 size) of 2-color chip LEDs. In addition to their breakthrough size, the SML-D22MUW features a special design that improves reliability along with a backside electrode configuration that supports high-resolution displays.

　　In recent years, chip LEDs are being increasingly used for numerical displays in industrial equipment and consumer devices. Conventional numerical displays utilize a single color to indicate numbers, but there is a growing need to change the color to make it easier to recognize abnormalities. However, this typically entails utilizing two separate LEDs, which doubles the mounting area along with development costs, or opting for a standard 2-color LED that also increases board size.

　　In contrast, proprietary technologies and processes allowed ROHM to integrate 2 chips in the same package size as conventional single-color LEDs, making it possible to emit multiple colors in a smaller footprint. Board space is reduced by 35% over standard 1.5 x 1.3mm 2-color LEDs, contributing to thinner displays. And after taking into consideration usage conditions during reflow, countermeasures were adopted that prevents solder penetration within the resin package to ensure greater reliability.

Ultra-Compact Low Profile 2-Color Chip LEDs

　　Availability: Now

　　Pricing: $0.136/unit (3,000pcs)

　　Key Features

　　1. Class-leading compact size contributes to smaller, thinner devices

　　In addition to element miniaturization, the SML-D22MUW leverages PICOLEDTM mounting and wire bonding technologies to mount 2 chips (red and green) in a compact 1.6 x 0.8mm package – the same size as conventional single-color LEDs.

　　Also, the extremely close configuration of color elements results in excellent color mixing properties that make it possible to produce not only red and green colors, but a number of intermediate colors as well.

Ultra-Compact Low Profile 2-Color Chip LEDs

　　2. Solder penetration countermeasure ensures superior reliability

　　Incorporating a stopper called a ‘resist' before the gold plating process blocks the gold pattern (that features good wettability). This prevents solder penetration into the resin, eliminating failures due to short-circuits and contributing to greater reliability.

Ultra-Compact Low Profile 2-Color Chip LEDs

　　3. Backside electrode configuration supports high-resolution display

　　Adopting a backside electrode design allows mounting in narrow spaces, enabling high-definition display in dot matrix and other applications.

　　Backside Electrode Configuration

Ultra-Compact Low Profile 2-Color Chip LEDs

　　Lineup

Ultra-Compact Low Profile 2-Color Chip LEDs

　　Terminology

　　PICOLED™

　　ROHM's ultra-compact LEDs ideal for portable equipment such as wearables and mobile devices.

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Trade news

Low-cost Lifetime Boost for Lithium Batteries

　　Want to boost your lithium-ion battery’s lifetime without setting the house on fire? Taiwan’s Industrial Technology Research Institute (ITRI, Hsinchu) is proposing a quick-fix solution: a composite paste that OEMs can apply to battery electrodes. ITRI claims, with the test data to support it, that its ChemSEI-Linker paste increases Li-ion batteries’ lifetime up to 70%. ITRI also says ChemSEI-Linker is a green technology because it enables easier recycling of Li-ion cells at the end of their extended lifetimes.　　ITRI engineered the material after analyzing why the electrodes always seem to be the weak link that causes Li-ion batteries to fail in the field. (The researchers looked at performance degradation, not the failures that result in fires or explosions; those have been traced to dendrites).　　After surveying the literature and testing the most likely culprits in its labs, ITRI concluded that the primary cause of full-lifetime failure is the buildup of a predatory solid-electrolyte interface (SEI) layer starting with the very first recharge cycle. The buildup layer thickens over the lifetime of the battery, gradually degrading its performance until it works so poorly as to need replacement.　　ITRI says ChemSEI-Linker inhibits that natural accumulation by depositing its own, nanoscale-thick SEI layer. The deposited SEI repels further buildup during recharging, much as depositing a single monolayer of oxidation on aluminum prevents more from accumulating and thereby makes the aluminum rust-free.　　“Normal SEI formation is similar to the growing of tree rings. During each charging cycle, an irreversible electrochemical decomposition of the organic electrolyte happens at the electrode surface. This kind of decomposition deposits a layer with an increasingly complex composition on the surface of the active material, thus the name: solid-electrolyte interphase,” Jing-Pin Pan, chief technology officer of ITRI’s Material and Chemical Research Laboratories, told EE Times in an exclusive interview in advance of its Nov. 9 announcement. “The performance degradation results from the continuous SEI formation. As the SEI grows thicker, transportation of the lithium ion from the electrolyte to the active material becomes more difficult. Further, the lithium ion itself tends to be reduced on the SEI surface or intercalated within the SEI layer, leading to the loss of free lithium. Eventually, that loss leads to a positive potential shift of the anode, rendering the battery unusable.”　　To nix this natural process, ITRI’s chemists searched for a methodology that would inhibit the constant thickening of the SEI layers on the anode and found that the intentional deposition of a first layer of SEI inhibits the growth of more layers during recharging. While the process is similar to the growth of a single oxidation layer on aluminum to prevent rusting, ITRI’s SEI formulation is many orders of magnitude more complex. As Pan described it, “ChemSEI-Linker is an integrated, multifunctional, unique combinational structure, which in situ combines organic hyperbranched polymer material with silane-type linkers, electroconductive additives, and conductive metallic-ion inorganic structural materials.”　　The protective film forms on the surface of the active electrode materials as the electrode paste is mixed. In lab testing, ITRI researchers found that the film provided stress buffering and functional protection for the interfaces between the various components (for example, the active electrode materials, electroconductive additives, and binders) of normal electrode paste.　　“The paste can be applied as a two-sided precision coating and baked to manufacture ChemSEI-linker electrodes. SEI film strongly adheres to the active electrode materials. The resultant electrodes have high durability and great stability, and can be assembled into a unique cell. ChemSEI-Linker can also be used as an adhesive to join active electrode particles, electroconductive additives, and binders,” Pan said.　　The material and application process would raise the manufacturing bill of materials for Li-ion cells by 7% to 10%, but that is an acceptable trade-off for the 70% potential extension of the product lifetime, according to ITRI. Pan noted that the coating stays put, virtually intact, throughout the extended lifetime of the battery.　　Lab results　　Beyond collecting test data on the formulation’s performance, ITRI reverse-engineered it to explain how and why the process preserves battery life, allowing higher energy output to be maintained over a longer period, while also enabling safer operation, higher voltage endurance, and a faster charge/discharge cycle.　　“With the ever-increasing desire for higher energy densities, the usual technique for battery manufacturers is to reach the goal by roller compaction. However, the cracks that occur with high-pressure rolling take their toll,” Pan said. “ChemSEI-Linker electrodes improve this adhesion from 85 kgf [kilogram-force] to 220 kgf on the electrode with ChemSEI-Linker, without producing any cracks after the standard folding test. In addition, ChemSEI-Linker forms a tenacious protection layer on the active material particle surfaces, thus effectively preventing the electrolyte from damaging the particles. This reduces the microcrack phenomenon in the primary and secondary particles in the charge/discharge process.”　　In more detail, IRTI’s life cycle testing was conducted with standard 1C charging and 1C discharging at 2.4 to 4.2 volts and 25°C. The results showed that the capacity retention of prismatic cells with ChemSEI-Linker-modified lithium nickel manganese cobalt (NMC) was better than 97% after 995 test cycles. This result showed that ChemSEI-Linker effectively protected the cathodes of NMC prismatic cells and was able to prevent discharge capacity loss, extending the battery’s potential lifetime to more than 3,000 charge/discharge cycles.　　“The service life of NCA [lithium nickel cobalt aluminum oxide] batteries with ChemSEI-Linker modification can reach 1,400 cycles (80% capacity retention), giving 70% longer service life than unmodified batteries,” said Pan. “ChemSEI-Linker modification also improves DCIR [direct current internal resistance] relative to unmodified systems, because the increase of DCIR is directly proportional to the increase of SEI on the surface of the anode material. ChemSEI-Linker surface modification effectively protects the NCA cathode material, allowing it to suppress SEI film growth on the NCA surface, thus reducing accumulated resistance and enhancing service life.”　　ITRI is not releasing all the details of the process until ITRI has obtained a U.S. patent, but Pan had this to say about maintaining higher energy over time: “As we know, the high-temperature environment causes battery capacity to fade. The reason is that the elements of active material ionize and dissolve into the electrolyte at high temperature. [At ITRI,] an aging test was conducted at 55°C for 30 days. The results for the change of cell capacity reveals that the capacity recovery ratios of the compared batteries after the aging test were 2% coating, >1% coating, and >0% coating; the corresponding values were 99%, 96%, and 93%, respectively. Moreover, the order for the manganese-ion dissolution quantities of the compared batteries after the aging test was 0% coating, >1% coating, and >2% coating, and the corresponding values were 220, 120, and 90 ppm [parts per million], respectively. These results proved that ChemSEI-Linker can effectively protect the cathodes of MCN/LMO [lithium nickel manganese/lithium manganese oxide] batteries and can prevent manganese-ion dissolution and battery capacity loss.”　　The researchers observed similarly favorable test results for voltage endurance. “With the normal charge- and discharge-cycle voltage range of 4.2 to 2.5 V, both ChemSEI-Linker-modified and unmodified batteries performed similarly within 500 cycles. However, the discharging capacity of a battery with ChemSEI-Linker modification is higher than that of an unmodified battery; hence the discharging range is higher after 500 cycles (for 4.2 to 2.5 V), and the battery capacity is 15% higher,” said Pan.　　Finally, ITRI claims the coating provides higher safety to the user. “Linker modification reduced the accelerating heat rates in the temperature region of the ARC [adiabatic calorimeter] tests,” Pan said. The accelerated heat rates for NCA, NCM, and LCO batteries with ChemSEI-Linker modification were 50, 10, and 0.2 °C/min, respectively, compared with 1,700, 400, and 4°C/min, respectively, for unmodified batteries. Because ChemSEI-Linker modification can control heat, it can prevent thermal runaway and thus makes batteries safer.”　　ChemSEI-Linker is still unavailable in the United States, but ITRI is authorized to license its use for industrial battery cooperation efforts once the U.S. Patent and Trademark Office issues a patent.

2017-11-13 00:00 阅读量：1030

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