Masterarbeit, 2016
88 Seiten, Note: 1,0
This Master's Thesis explores various methods of white light generation for worklamp systems utilizing semiconductor technologies. The study delves into the technical aspects of phosphor conversion (PC) systems, currently considered the state-of-the-art, as well as RGB color mixing systems. By focusing on color temperature and color rendering index as crucial parameters, the research proposes a Light Emitting Diode (LED) and a Laser Diode (LD) concept for RGB white light generation. The thesis also examines a reference system based on color conversion using phosphors.
This research focuses on semiconductor-based light generation methods for worklamp systems, particularly exploring phosphor conversion (PC) and RGB color mixing techniques. Key themes include color temperature, color rendering index (CRI), light distribution, and spectral characteristics. The study analyzes the potential of RGB laser diodes (LD) for white light generation and compares them to conventional PC systems, highlighting the challenges and opportunities associated with this technology.
Phosphor converted (PC) systems use a blue source with a phosphor layer, while RGB systems mix red, green, and blue light sources to create white light.
The investigation using three laser diodes produced a CRI of up to 45, whereas phosphor-converted modules achieved a CRI of 71.
TM30 is a newer method for calculating color reproduction criteria that often provides a more favorable evaluation of RGB light sources compared to the traditional CRI method.
Key challenges include strong temperature dependency (especially of the red laser diode) and the difficulty of achieving homogeneous light distribution.
RGB LED systems show great potential for applications requiring variable spectra, achieving slightly better parameters (approx. 2%) when measured with the TM30 method.
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