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Osram modifies its ambient light sensor to achieve outstanding signal quality

The new SFH 2440 photodiode from Osram Opto Semiconductors combines short switching times with a spectral sensitivity optimized for visible light. The component enables high-quality heart rate measurements to be made with the aid of green LEDs. Typical applications include wearables such as fitness armbands and smartwatches. With its greatly reduced sensitivity to infrared light, SFH 2440 is also ideal as an ambient light sensor.

Shine or illuminate? Developing what the market needs

From smart bulbs in private households to efficient greenhouse lighting to attractively staged architecture, depending on the application soft or signal colours might be needed. The light might need to simply shine, or illuminate something else. So OSRAM Opto Semiconductors has added a new method to its colour LED manufacturing capabilities. Normally, the semiconductor crystals in LEDs generate the colours directly. This gives a narrow spectrum peak (for example, 600 to 630 nanometres for red), which the human eye perceives as a very piercing light. By contrast, the new production method uses only blue semiconductors as a basis. A luminescent material with the desired colour is added in packaging, i.e. assembly. As a result the LED covers a wider spectrum (550 to 700 nanometres for red) and the colour appears softer. With this innovation, OSRAM Opto Semiconductors is able to make LEDs with exactly the kind of light its customers need. It also meets all other industry-specific requirements, as a look at the following key applications will demonstrate.

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