White light quality of phosphor converted LEDs from a phosphor materials perspective of view: an evaluation based on combined thermal and optical simulations

摘要

Color constancy and color maintenance are key issues in the context of the utilization of light-emitting diodes (LEDs) for general lighting applications. For a systematic approach to improve the white light quality of phosphor converted LEDs and to fulfill the demands for color temperature reproducibility and constancy, it is imperative to understand how compositional, optical and thermal properties of the color conversion elements (CCE), which typically consist of aphosphor particles embedded in a transparent matrix material, affect the correlated color temperature of a white LEDsource. Based on a combined optical and thermal simulation procedure, in this contribution we give a comprehensivediscussion on the underlying coherences of light absorption, quantum efficiency and thermal conductivity and deducesome strategies to minimize the temperature increase within the CCE in order to maintain acceptable color variationsupon device operation.© (2012) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.