IR LED 940 nm, also known as infrared LED with a peak emission wavelength of 940 nm, has become an essential component in various industries due to its unique properties and wide applications. This article aims to provide an in-depth introduction to the IR LED 940 nm industry, covering its history, technology, applications, and future prospects.

History of IR LED 940 nm

The development of IR LED 940 nm can be traced back to the 1960s when infrared technology began to emerge. At that time, researchers were primarily focused on the development of IR diodes, which were used in various applications such as remote controls and optical communication. In the 1970s, the peak emission wavelength of IR diodes was shifted to 940 nm, which became the standard for IR LED applications due to its favorable properties, such as lower cost and longer transmission distance.

Technology of IR LED 940 nm

The technology of IR LED 940 nm involves the design and fabrication of a semiconductor material that emits infrared light at a peak wavelength of 940 nm. The most commonly used material for this purpose is AlInGaAs, which has a bandgap of approximately 1.3 eV. The following are the key aspects of the technology: 1. Material growth: The first step in the fabrication process is the growth of the AlInGaAs semiconductor material using molecular beam epitaxy (MBE) or metalorganic chemical vapor deposition (MOCVD) techniques. 2. Device structure: The IR LED 940 nm typically consists of a p-n junction structure, where the p-type layer is composed of InGaAs and the n-type layer is composed of AlInAs. A thin layer of AlInAs is placed between the p and n layers to serve as a window layer, which enhances the light extraction efficiency. 3. Light extraction: To improve the light extraction efficiency of the IR LED 940 nm, various techniques such as microlens arrays, antireflection coatings, and surface texturing are employed. 4. Packaging: The final step is the packaging of the IR LED 940 nm, which involves encapsulating the device in a suitable material to protect it from environmental factors and to facilitate heat dissipation.

Applications of IR LED 940 nm

IR LED 940 nm finds extensive applications in various industries, including: 1. Consumer electronics: IR LED 940 nm is widely used in remote controls, game controllers, and TV tuners due to its long transmission distance and low cost. 2. Security and surveillance: IR LED 940 nm is employed in security cameras and motion sensors for night vision and long-range detection capabilities. 3. Automotive industry: IR LED 940 nm is used in automotive applications such as reverse parking sensors, adaptive cruise control, and collision avoidance systems. 4. Medical devices: IR LED 940 nm is utilized in medical devices for imaging, such as endoscopes and optical coherence tomography (OCT) systems. 5. Industrial automation: IR LED 940 nm is used in industrial automation for machine vision, barcode scanning, and optical communication systems.

Market Trends and Future Prospects

The IR LED 940 nm market has been witnessing steady growth over the past few years, driven by the increasing demand for infrared technology in various applications. The following are some of the key market trends and future prospects: 1. Rising demand for smart devices: The growing popularity of smart devices, such as smartphones, tablets, and smart TVs, has led to a surge in the demand for IR LED 940 nm for remote control applications. 2. Advancements in technology: Continuous advancements in the technology of IR LED 940 nm, such as higher efficiency, longer lifespan, and smaller size, are expected to drive the market growth. 3. Expansion into new applications: The IR LED 940 nm market is expected to expand into new applications, such as augmented reality (AR) and virtual reality (VR), which require high-resolution and long-range infrared sensors. 4. Environmental concerns: As environmental awareness increases, the market may witness a shift towards more energy-efficient and sustainable IR LED 940 nm technologies. In conclusion, the IR LED 940 nm industry has a promising future, driven by its unique properties and wide applications. With continuous technological advancements and market growth, IR LED 940 nm is poised to play a crucial role in shaping the future of various industries.