(IMAGE) Technical University of Munich (TUM) Caption Crystals of black arsenic phosphorus -- exchanging phsphorus against arsenic, the band gap can be tuned to as low as 0.15 eV, making the material predestined for long wavelength infrared sensors. Credit Andreas Battenberg / TUM Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.