Adhesive As-S-Se-I immersion lenses for enhancing radiation characteristics of mid-IR LEDs operating in wide temperature range

•LED integral power as a function of refractive index for two lens shapes has been simulated.•Chalcogenide melt adhesion force towards electronic engineering materials has been determined.•LED stability against cracking in wide temperature range has been calculated and experimentally justified.

The influence of As-S-Se-I chalcogenide glass lenses on the integral and spectral power and pattern of LED radiation has been shown. Simulation of the influence of the refractive index on the integral power for two lens shapes has been performed. The wettability and adhesion force of As-S-Se-I melt has been determined for several electronic engineering materials. Mechanical stresses between chalcogenide glass and adjacent diode body materials have been calculated for −100 to 53 °C temperature range. Stability of the immersion lenses against cracking has been experimentally investigated for −150 to 53 °C temperature range.