@inproceedings{Wyble2008_0,<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Abstract = {This paper evaluates the ability of certain white LEDs to stimulate fluorescent excitation from office paper optical brighteners (OBAs) and a daylight fluorescent materials. These LEDs are of two types: blue emitter stimulating a yellow phosphor or a combined red, green, and blue emitters. After bispectral measurement of the paper and other materials, the analysis compares the L* change between the reflected and total radiance factors under each LED source. A large L* difference indicates that fluorescent emissions are taking place. One important note is that there is no consideration being made on properties such as CRI, efficiency, efficacy, etc.
<br>   Initial results are that the blue plus yellow phosphor type white LEDs do not adequately excite paper OBAs. The maximum ΔL* found was only 0.42 units for paper. The tri-color LEDs stimulate somewhat more fluorescent emission, but still very low. While this result may not be unexpected, it should merit attention of both the illumination and paper industries. Without some coordination the appearance of current papers are likely to change dramatically should illumination technologies such as this be adopted more universally in office or retail environments.},<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Address = {Troy, New York, USA},<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Author = {David R. Wyble},<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Booktitle = {Council of Optical Radiation Measurements Annual Meeting},<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Keywords = {solid state lighting},<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Month = {},<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Organization = {Council for Optical Radiation Measurements},<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Title = {Fluorescent Excitation from White LEDs},<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Url = {},<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Year = {2008}