Luminosity response function

The values of x, y, and z published by the CIE are presented in Figure 3 y(X) is also the luminosity response function. As discussed above, these curves can loosely be regarded as the eye response curves of red, green, and blue color receptors in the eye. For greatest effectiveness, a phosphor s emission spectrum has to match these curves well to yield both the proper color and maximum brightness. Of the two components of rare earth phosphors, the host largely determines efficiency while the activator determines the emission spectrum. 

Figure 1.14 Instrumental response function of an electrostatic energy analyser shown as a function of the spectrometer voltage l/sp. Maximum transmission is achieved at the nominal voltage l/°p, and this maximum value is equal to the luminosity L (left-hand scale) or set to unity (right-hand scale), respectively. For values other than l/°p the response function decreases, and the characteristic fwhm value is indicated. For the relation fU% = °, see...

Figure 5.5.10-2 compares the typical putative spectrums based on such a linear analysis, (3, y, p compared to the actual chromophores, Rhodonines 5, 7 9 [with Rhodonine(l 1) shown for completeness. It is not significant in human vision except for aphakic patients.] Hunt describes the (3,y p spectrums as probable sensitivity curves of the three types of cones. He did not discuss any rod spectrum in his figure. The probable sensitivity curves appear to have been normalized individually. The peak in the p spectrum appears to be at a longer wavelength than frequently suggested. However, it is still at too short a wavelength to support the known spectral response of the human eye as illustrated by the Photopic Luminosity Function. 

Because the major application of OLEDs/PLEDs is for displays, the response of the human eye, described by the photopic luminosity function [15], must be taken into account. The photopic luminosity function is shown in Fig. 4.4. By using the photopic luminosity function, the radiance (watts/(sr m2)) is converted into the luminance (candela/m2, cd/m2 or lumen/(sr m2)). Therefore, photometry is used to measure the forward viewing luminance at the surface of an OLED/PLED. 

The quantities appearing in the equations are divided into input variables and output variables or responses of the model. The responses would be the predictions of experimentally observed entities or their known functions. Actual responses, typical for combustion research, are the intensity of a light beam, the voltage generated by a pressure transducer, etc. The researcher is interested, however, in concentrations of species as well as their logarithms and ratios, pressures, temperatures, ignition delay times, luminosity of flames, amounts of soot formed, etc. They can be taken for responses but only when the instrumental functions, i.e., the relationships between the actual responses and the entities considered, are known precisely. 

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