Dr. Rui Li Profile

Dr. Rui Li

at Univ of Toronto

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Proceedings Article | 4 March 2013 Paper

Near-field photometry for organic light-emitting diodes

Rui Li, Krishnan Harikumar, Alexandar Isphording, Venkat Venkataramanan

Proceedings Volume 8641, 86410A (2013) https://doi.org/10.1117/12.2002110

KEYWORDS: Organic light emitting diodes, Near field, Deep ultraviolet, Light sources, Solid state lighting, Photometry, Near field optics, Semiconductors, Light sources and illumination, Light emitting diodes

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Organic Light Emitting Diode (OLED) technology is rapidly maturing to be ready for next generation of light source for general lighting. The current standard test methods for solid state lighting have evolved for semiconductor sources, with point-like emission characteristics. However, OLED devices are extended surface emitters, where spatial uniformity and angular variation of brightness and colour are important. This necessitates advanced test methods to obtain meaningful data for fundamental understanding, lighting product development and deployment. In this work, a near field imaging goniophotometer was used to characterize lighting-class white OLED devices, where luminance and colour information of the pixels on the light sources were measured at a near field distance for various angles. Analysis was performed to obtain angle dependent luminous intensity, CIE chromaticity coordinates and correlated colour temperature (CCT) in the far field. Furthermore, a complete ray set with chromaticity information was generated, so that illuminance at any distance and angle from the light source can be determined. The generated ray set is needed for optical modeling and design of OLED luminaires. Our results show that luminance non-uniformity could potentially affect the luminaire aesthetics and CCT can vary with angle by more than 2000K. This leads to the same source being perceived as warm or cool depending on the viewing angle. As OLEDs are becoming commercially available, this could be a major challenge for lighting designers. Near field measurement can provide detailed specifications and quantitative comparison between OLED products for performance improvement.

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