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ROHM Develops a Novel VCSELED™ Infrared Light Source that Combines Features of VCSELs and <span style='color:red'>LEDs</span>

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ROHM Develops a Novel VCSELED™ Infrared Light Source that Combines Features of VCSELs and LEDs

　　ROHM has established VCSELED™, a new infrared light source technology that encapsulates a VCSEL (Vertical Cavity Surface Emitting Laser) element in a resin optical diffusion material for laser light. ROHM is currently developing this technology for commercialization as a light source for improving vehicle Driver Monitoring Systems (DMS) and In-Cabin Monitoring Systems (IMS).　　To further enhance automotive safety, driver monitoring systems are increasingly being installed in vehicles equipped with Advanced Driver Assistance Systems (ADAS) to detect drowsiness, sleepiness, and distracted driving. In Japan, the Ministry of Land, Infrastructure, Transport, and Tourism (MLIT) has created guidelines that define the design and functions of the system, and in the EU, there are plans to make installation mandatory in all new vehicles sold in Europe from July 2024 onwards. Automakers and suppliers are also developing in-vehicle monitoring systems to detect occupants other than the driver, and there is a growing awareness of the need for high-performance light sources that enable detection systems to function with greater precision.　　In response, ROHM has developed VCSELED™ that achieves high-accuracy sensing. Minimal wavelength temperature variation combined with a wide emission beam angle make it ideal not only for in-vehicle monitoring systems, but also contribute to improving the accuracy and performance of inspection systems for robots and industrial equipment as well as spatial recognition and ranging systems.　　VCSELED™ extends the beam (irradiation) angle similar to LEDs by combining a high-performance VCSEL element and light diffusion material to enable sensing over a wider area with higher accuracy than VCSELs. What’s more, the light emitting element and light diffuser are integrated into a compact package, contributing to smaller, thinner applications.　　The VCSEL element used in VCSELED™ features a narrow emission wavelength bandwidth of 4nm, approximately one-seventh that of LEDs. This characteristic improves resolution performance on the receiving side while eliminating the red glow often associated with LEDs. At the same time, a wavelength temperature variation of 0.072nm/°C - less than one-fourth that of LEDs (0.3nm/°C) - allows for high-accuracy sensing unaffected by temperature changes. Furthermore, the response time when emitting light is 2ns, approx. 7.5 times faster than LEDs, contributing to higher performance in ToF (Time of Flight) applications that use infrared light to measure distance.　　ROHM is working on commercializing VCSELED™ as a new technology brand for infrared light source components. Prototype samples is available for purchase now, with mass production samples for consumer scheduled for release in October 2024 and automotive use in 2025, respectively. To obtain samples, please contact a sales representative or visit the contact page on ROHM’s website. Going forward, we will continue to develop laser light source technology for in-vehicle monitoring and other systems.　　TerminologyVCSEL　　Short for Vertical Cavity Surface Emitting Laser. Although conventionally used for communication, it is increasingly being adopted in recent years as a light source for the optical block in sensing systems.　　DMS　　Stands for Driver Monitoring System. A safe driving assistance function that detects whether the driver can continue safe driving based on facial and eye movements and provides alerts via sounds and/or text to prevent accidents before they occur.　　IMS(ICMS)　　Abbreviation for In-Cabin Monitoring System. This system expands the detection range to include front and rear passenger seats, occupant recognition, and biometric sensing to improve safety and comfort.　　Red Glow　　When high power infrared LEDs are used in sensors and other devices, there is a possibility that wavelengths close to those of visible light will be emitted that can be detected by the human eye. In this case, the sensor appears slightly red, hence the term “red glow”.

Key word：

ROHM

Release time：2024-06-27 13:42 reading：554 Continue reading>>

AMEYA360:Kingbright APFA2507x Bi-Color SMD <span style='color:red'>LEDs</span>

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AMEYA360:Kingbright APFA2507x Bi-Color SMD LEDs

　　Kingbright APFA2507x Bi-Color SMD LEDs are designed with AlGaInP on GaAs substrate Light Emitting Diodes (LEDs). These LEDs feature low power consumption, wide viewing angles, and tinned pads for improved solderability. The APFA2507x LEDs are halogen-free, RoHS compliant, and ideal for backlight, healthcare applications, wearable and portable devices, and status indicators.　　FEATURES　　2.5mm x 1.0mm x 0.7mm right angle SMD LED　　Low power consumption　　Wide viewing angle　　Ideal for backlight and indicator　　3000 pcs/reel package　　3 moisture sensitivity level　　Tinned pads for improved solderability　　Halogen-free　　RoHS compliant　　APPLICATIONS　　Backlight　　Status indicator　　Home and smart appliances　　Wearable and portable devices　　Healthcare

Key word：

AMEYA360,Kingbright,APFA2507x

Release time：2023-03-30 09:44 reading：2402 Continue reading>>

Cree LED CV94A-FGC Standard <span style='color:red'>LEDs</span>

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Cree LED CV94A-FGC Standard LEDs

　　Cree LED CV94A-FGC Standard LEDs feature an IPx8 water-resistant rating in a PLCC6 package. This PLCC6 package offers an increased package height to ease the manufacturing process. These high-performance tricolor SMT LEDs are designed to work in various applications. The CV94A-FGC standard LEDs feature encapsulation resin that contains UV inhibitors to minimize the effects of long-term exposure to direct sunlight. This results in stable light output over the life of the LED. The CV94A-FGC standard LEDs feature a 5a moisture sensitivity level, lead-free, and are RoHS compliant. These standard LEDs operate at 2.7V forward voltage and -40°C to 85°C temperature range. The CV94A-FGC standard LEDs are ideally used in full-color video screens, digital billboards, and petrol signs.　　FEATURES　　9.4mm x 4.2mm x 4mm size　　Dominant wavelength:　　Red (619nm to 624nm)　　Green (520nm to 540nm)　　Blue (460nm to 480nm)　　Luminous intensity:　　Red (1120mcd to 2520mcd)　　Green (1800mcd to 4025mcd)　　Blue (403mcd to 900mcd)　　Water-Resistant (IPx8)*　　5a: Moisture sensitivity level　　Lead-free　　RoHS compliant　　SPECIFICATIONS　　2.7V forward voltage　　Power dissipation:　　140mW (red)　　126mW (green and blue)　　Forward current:　　50mA (red)　　35mA (green and blue)　　100mA peak forward current　　5V reverse voltage　　110°C junction temperature　　-40°C to 85°C operating temperature range　　40°C to 100°C storage temperature range　　APPLICATIONS　　Electronic Signs and Signals (ESS)　　Full-color video screen　　Digital billboards　　Motorway signs　　Variable Message Sign (VMS)　　Advertising signs　　Petrol signs

Key word：

Cree LED,CV94A-FGC

Release time：2023-03-27 11:46 reading：3437 Continue reading>>

Report: <span style='color:red'>LEDs</span> Cut 570 Million Tons of CO2 in '17

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Report: LEDs Cut 570 Million Tons of CO2 in '17

　　The efficiency of LEDs compared to traditional incandescent and fluorescent lighting is one of the most highly touted benefits of the technology. According to a new report by IHS Markit, the use of LEDs to light buildings and outdoor spaces reduced the total carbon dioxide emissions of lighting by some 570 million tons in 2017.　　This reduction, roughly equivalent to 162 coal-fired power plants, enabled LED component and lighting companies to reduce the global carbon footprint by about 1.5 percent this year, IHS Markit(London) estimates.　　Jamie Fox, a principal analyst for the market research house's lighting and LED group, believes LEDs have enabled LED component and lighting companies to transform their industry. These companies, he said, "are fighting climate change much more effectively than other industries, and they should be given credit for it."　　Fox added: "Unlike in other industry sectors, workers at LED companies can honestly say that by selling more of their products, they are helping to reduce global warming."　　LED lighting uses an average of about 40 percent less power than fluorescent and 80 percent less than incandescents to produce the same amount of light, according to Fox. He expects the impact of LEDs on the global carbon footprint to become more pronounced as more LEDs are installed around the world.　　Based on IHS' analysis of market share data for LED component suppliers, Nichia Corp., a Japanese supplier of LEDs, can saved the most carbon overall. The firm accounted for about 10 percent of all carbon dioxide reduced through the use of LEDs in 2017, or roughly 57 million tons, according to IHS.　　Cree followed Nichia with 8 percent, while Lumileds, Seoul Semiconductor, MLS, Samsung and LG Innotek each have a share in the range of 4 percent to 7 percent, according to IHS.

Key word：

LED

Release time：2017-12-28 00:00 reading：1286 Continue reading>>

Method to tune nanocrystalline <span style='color:red'>LEDs</span>

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Method to tune nanocrystalline LEDs

　　A method to tune the colour of the light emitted by an LED by altering the size of its semiconductor crystals has been discovered researchers from Ludwig-Maximilians-Universitaet (LMU) in Munich and the Johannes Kepler University (JKU) in Austria.　　Light-emitting diodes (LEDs) produce light of a defined colour within the spectral range from the infrared to the ultraviolet. The exact wavelength of the emission is determined by the chemical composition of the semiconductor employed.　　In the case of some semiconducting materials, the colour can also be tuned by appropriately modifying the size of the crystals of which the light-emitting layer is composed.　　The researchers have developed a method for the production of semiconducting nanocrystals of a defined size based on the cheap mineral oxide known as perovskite. These crystals are said to be extremely stable – which ensures that the LEDs exhibit high colour fidelity – and the resulting semiconductors can be printed on surfaces.　　Using a scalable and economical electrochemical process, a thin wafer was patterned like a waffle. The depressions served as tiny reaction vessels, whose shape and volume ultimately determined the size of the nanocrystals.　　“Our nanostructure oxide layers also prevent contact between the semiconductor crystals and deleterious environmental factors such as free oxygen and water, which limit the working lifetime of the LEDs,” explains JKU Dr Martin Kaltenbrunner.

Key word：

nanocrystalline LEDs

Release time：2017-08-18 00:00 reading：1078 Continue reading>>

Purple-emitting <span style='color:red'>LEDs</span> Get Closer to the Sun

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Purple-emitting LEDs Get Closer to the Sun

　　Seoul Semiconductor Co. Ltd., in partnership with Toshiba Materials Co. Ltd., has created an LED that it says more closely mimics the spectrum of natural daylight.　　Called SunLike, the LEDs combine Seoul Semiconductor’s high-brightness purple LEDs with advanced red, green, and blue (RGB) phosphors developed at Toshiba Materials. Up to now, most approaches have mimicked daylight by combining blue-emitting LEDs with yellow and red phosphors to fill out the rest of the spectrum, but that method results in peaks in the blue spectrum.　　Blue peaks are undesirable because the amount of blue light the human eye can accept is limited. Over-illumination with blue light results in scatter, which distorts the texture and color of illuminated objects. Research also suggests that exposure to excess blue light can have negative health effects related to interruption of the circadian rhythms.　　The secret to SunLike’s performance is the phosphors, said Seoul Semiconductor CEO Chung Hoon Lee. “Other companies that have tried to use purple LEDs to mimic daylight still suffer from purple peaks,” he said. “Toshiba Materials’ new phosphor is perfect, and that’s the difference.”　　The RGB phosphors used in the SunLike product underwent extensive engineering development at Toshiba Materials to produce a technology Toshiba calls TRI-R. A new phosphor paste coating process was also developed using a mixture of organic resin to minimize energy loss.　　“As of today, there is no other manufacturer who can make daylight-like products in terms of spectrum,” said Katsuhiro Shinosawa, director and chief marketing executive at Toshiba Materials Japan. “Others are offering high CRI [color-rendering index] products, but our products have quite different properties in terms of spectrum—similar to the solar spectrum.”　　Seoul Semiconductor’s Lee said SunLike’s luminous efficiency in lumens/watt is around 10 percent lower for than for existing lighting products. “We will work to make this equal within a year,” Lee said. “Color quality is the most important thing right now.”　　Market trends in LED chips over the years have focused on efficiency, price, and added features for the luminaire, such as connectivity. “All these features have been given priority over the quality of light,” said Andreas Weisl, managing director and vice president of sales for Europe at Seoul Semiconductor.　　Weisl said one product line will hit the European and U.S. markets immediately: a chip-on-board (COB) series intended for general residential, architectural, health-care, and retail lighting. A line of mid-power surface-mount products, targeting linear applications such as tubes, will launch in July. That series will use Seoul Semiconductor’s multijunction technology (MJT), which places more than one LED on a chip, doing away with wire bonds and allowing the junctions to be driven at higher voltages.　　Seoul Semiconductor also has a “clear intention” to put SunLike LEDs into its package-free WICOP technology, Weisl said. Use of the package-free form factor will improve uniformity, system cost and efficiency and allow clustering of the chips, he said. The WICOP products should reach the market in 2018.

Key word：

LEDs,Sun

Release time：2017-06-27 00:00 reading：966 Continue reading>>

model	brand	Quote
RB751G-40T2R	ROHM Semiconductor
CDZVT2R20B	ROHM Semiconductor
BD71847AMWV-E2	ROHM Semiconductor
TL431ACLPR	Texas Instruments
MC33074DR2G	onsemi

model	brand	To snap up
IPZ40N04S5L4R8ATMA1	Infineon Technologies
TPS63050YFFR	Texas Instruments
BP3621	ROHM Semiconductor
ESR03EZPJ151	ROHM Semiconductor
BU33JA2MNVX-CTL	ROHM Semiconductor
STM32F429IGT6	STMicroelectronics

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