Via photoplethysmography (PPG), red light and infrared LEDs can receive date from the environment and measure biometric data including heart rate, blood oxygen, blood pressure and blood sugar level. Adopting the sensing components to wearable devices enables a wider range of applications with many leading brands working on launching related products. (Image: Pixabay) A patent Apple received earlier this year describes how Apple Watch could analyze composition of water and determine the pH level of user’s sweat through the sensing components like short-wave infrared...

An international research team has developed near-infrared (NIR) LED based on perovskite in a laboratory at Linköping University in Sweden which achieve a record external quantum efficiency of 21.6 percent Perovskites have good light-emitting properties and are easy to manufacture. However, the external quantum efficiency of perovskite-based LED has until now been limited due to defects that arise in the material during manufacture. The defects act as traps for the charge carriers and thus cause energy losses. (Image: Linköping University) To solve the ...