Abstract:
Light is a form of energy that affects the human sleep cycle, working hours, alertness, productivity, and
well-being. As one of the most essential environmental factors, lighting requires extensive research to
understand the human-environment interaction. Earlier studies reveal that various artificial lighting
technologies are utilised to investigate the human circadian system; experiments employing solid state
lighting (SSL) sources are still being conducted to determine how the human circadian system is
affected. Due to the advantages of OLED lighting, there is a need to enhance the use of this form of
artificial lighting in an indoor environment. This paper focuses on a literature review on artificial
lighting sources, particularly OLED lighting, which has been used from the past to the present. This
paper also discusses how OLED lighting can be utilised to alter the human circadian system in an indoor
environment.