Osram presents first broadband infrared LED
Osram Opto Semiconductors is using converter technology for infrared emitters for the first time. The result is the SFH 4735 - an LED that emits broadband infrared light in a wavelength range from 650 to 1050nm. The main application is near-infrared spectroscopy, for example for analysing food.
Infrared spectroscopy uses the characteristic absorption behaviour of certain molecular compounds. If a defined spectrum is directed at a sample it is possible to determine the presence and quantity of certain ingredients from the wavelength distribution of the reflected light. This method is used in the food industry and in agriculture, among other sectors. It is possible, for example, to measure the water, fat, carbohydrate, sugar or protein content of foodstuffs. This data provides an indication of freshness, quality or calorie content.
Osram believes that this new infrared LED opens this measurement technique up to consumers. One option would be a compact sensor - like a USB stick - which would be used with an appropriate smartphone app to measure calories, freshness or nutritional content.
First converter for infrared emitters
The basis of the SFH 4735 is a blue 1 mm2 chip in UX:3 technology. Its light is converted into infrared radiation with the aid of a phosphor converter developed specifically for this application. A residual blue component in the light helps users target the area they want to investigate. The emission spectrum of the SFH 4735 has a homogeneous spectral distribution in the infrared range. The chip is mounted in the Oslon Black Flat package which is characterised in particular by good thermal resistance.
Food analytics supplements bio monitoring
Compact units for spectroscopic chemical analyses open up a completely new range of applications in consumer electronics. Experts expect that it will be possible in the near future to integrate spectrometers directly in mobile devices. The new technology is a natural extension of bio monitoring, in other words the trend for measuring various vital signs such as pulse rate and calorie consumption. A smartphone spectrometer will enable users to monitor the food they eat in a similar manner. Medicines can also be checked in the same way.
"Future applications are also of particular interest", said Udo Jansen, product marketing manager for infrared at Osram Opto Semiconductors. "It is conceivable that the emission range can be extended to include wavelengths up to 2,000 nanometers, in other words into the middle infrared spectral range. This will allow more precise and detailed measurements and will open up new options for everyday analyses of certain environmental parameters such as air quality."
