This paper explored the feasibility of using a LED-based bulb as the illumination light source for photolithography room.
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 visional 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.