‘No Blue’ White LED

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This paper explored the feasibility of making a white LED light source by color mixing method without using the blue color. This ‘no blue’ white LED has potential applications in photolithography room illumination, medical treatment and biophotonics research. A no-blue LED was designed, and the prototype was fabricated. The spectral power distribution of both the LED bulb and the yellow fluorescent tube was measured. Based on that, colorimetric values were calculated and compared on terms of chromatic coordinates, correlated color temperature, color rendering index, and chromatic deviation. Gretagmacbeth color charts were used as a more visual way to compare the two light sources, which shows that our no-blue LED bulb has much better color rendering ability than the YFT. Furthermore, LED solution has design flexibility to improve it further. The prototype has been tested with photoresist SU8-2005. Even after 15 days of illumination, no effect was observed. So this LED-based solution was demonstrated to be a very promising light source for photolithography room illumination due to its better color rendering in addition to energy efficiency, long life time and design flexibility. Additionally, the prototype is being implemented to treat a Porphyria patient.
Original languageEnglish
Title of host publicationNew Lighting - New LEDs : Aspects on light‐emitting diodes from social and material science perspectives
PublisherLinköping University Electronic Press
Publication date2010
ISBN (Print)9789173932707
Publication statusPublished - 2010


  • photolithography
  • design flexibility
  • energy saving
  • LED


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