Spatial uniformity of the spectral radiance by white LED-based K&lt;sub&gt;2&lt;/sub&gt;CaP&lt;sub&gt;2&lt;/sub&gt;O&lt;sub&gt;7&lt;/sub&gt;:Ce&lt;sup&gt;3+&lt;/sup&gt;, Tb&lt;sup&gt;3+&lt;/sup&gt; phosphor
Bulletin of Electrical Engineering and Informatics