Influence of injection current and ambient temperature on intensity and wavelength of low-power SMD LED

Low power surface-mounted (SMD) LEDs are paid much attention in research and development due to their portability and miniaturization. Optical characteristics of SMD LEDs have to maintain more accurate specifications in signaling applications such as traffic lights or railway. Current and temperature stabilization is important for attaining constant spectral properties of SMD LEDs. In this manuscript, the effect of change in ambient temperature and injection current on SMD LED intensity and wavelength shift is reported. Measurements were carried out using a spectrometer to record the LED optical parameters at various operating conditions. Detailed analyses show that the ambient temperature has a significant influence on optical characteristics of low-power SMD LED. The investigation of LED optical behaviors helps in choosing the appropriate working condition at the optimum level.