The emission from silicon referred to by myself248 is in the near infrared, not the thermal range. It's a commonly used diagnostic technique for silicon solar c

The emission from silicon referred to by myself248 is in the near infrared, not the thermal range. It's a commonly used diagnostic technique for silicon solar cells: https://www.pveducation.org/pvcdrom/characterisation/electroluminescence https://www.pveducation.org/pvcdrom/characterisation/electro... I don't know if it could be used for the much smaller features found on integrated circuits, though.