Measurement of the Effect of Luminescent Layer Parameters on Light and Communication Properties

This publication describes the measurement of the effect of selected luminescent layer parameters on the light and communication characteristics of light generated by a luminescent layer using a light-emitting diode (LED) as a radiation source. The luminescent layers were implemented based on a combination of polydimethylsiloxane (PDMS) polymer and YAG:Ce and CaS:Eu phosphors by spin coating. For the chosen weight ratios of PDMS and phosphors, a set of test samples of luminescent layers was implemented whose thicknesses differed from each other in the order of units to tens of micrometers. Experimental measurements have clearly shown that even a slightest change in the thickness of the luminescent layer has a nonnegligible effect on the change of the luminous and communication parameters of the light generated by the luminescent layer. The colorimetric parameters of the color colorimetry temperature (CCT), color rendering index (CRI), and color coordinates $x$ and $y$ [Commission Internationale de l’Eclairage (CIE) 1931] were recorded for the investigated luminescent samples. The communication parameters were evaluated by measuring the error vector magnitude (EVM), modulation error ratio (MER), phase error, bit error rate (BER), and normalized signal-to-noise ratio $E_{b}/N_{0}$ .