García Botella, ÁngelÁlvarez Fernández-Balbuena, AntonioVázquez Molini, DanielBernabeu Martínez, Eusebio2023-06-202023-06-202001-02-011559-128X10.1364/AO.40.000533https://hdl.handle.net/20.500.14352/59229© Optical Society of America. The authors thank A. González-Cano for his suggestions. This research was supported by Proyecto para el Estímulo a la Transferencia de Resultados de Investigación (PETRI) grant 95-0344-OP, a project of the Comisión Interministerial de Ciencia y Tecnología of Spain.The application of LED technology to fields such as alphanumerical displays and traffic control is continuously increasing. Because the technology is used outdoors, it must be able to operate under various environmental conditions. Like all semiconductor devices, LED’s have properties that change with temperature. We propose a semiempirical model, based on semiconductor solid-state theory, that predicts the changes in the emission spectrum including the effect of temperature changes on the optical properties of the LED, within a range appropriate for outdoor applications (0–40 °C). This model permits us to evaluate the changes in the output flux and the chromaticity coordinates of the LED. We checked this model with seven different LED’s.engjournal articlehttp://dx.doi.org/10.1364/AO.40.000533http://www.opticsinfobase.orgopen access535Semiconductor DevicesÓptica (Física)2209.19 Óptica Física