If we want the color temperature of the mixed light to be 4000 K, we must calculate the weight concentration of Y-561 phosphor from the coordinates of the cross point of the black locus at 4000 K and a line connecting the location points of the blue LED and phosphor emission spectra on the CIE chromaticity diagram
, as shown in Figure 13.
CIE chromaticity diagram
was analyzed using OSRAM Sylvania, Inc.
Caption: Figure 9: The CiE chromaticity diagram
of emission spectra of 1 mol% GdV[O.sub.4]:[Sm.sup.3+].
Figure 9(c) shows the CIE chromaticity diagram
for 3 mol% Eu doped NaY[F.sub.4] microcrystal under 323 nm excitation wavelength.
Caption: Figure 6: CIE x, y chromaticity diagram
of EL device with ZnS:Cu phosphor change in all thickness.
It is already known that the coordinate of the non-chromatic stimulus point in the chromaticity diagram
is (0.3101, 0.3162).
The first chapter is devoted to fundamentals of light-emitting diodes, the perception of vision by the human eye, methods used in conjunction with the chromaticity diagram
, and associated international standards in terms of color temperatures and color rendering index.
, Commission Internationale de l'Eclairage (CIE): A two-dimensional graph that describes a color as the locus of chromaticity coordinates on a field of monochromatic light varying from 380 to 780 nm in wavelength.
To achieve this goal we "translated" the results obtained by other authors' from the nomenclature corresponding to the specific atlas employed to a CIE "common language": the language of the CIE L*u*v* space and its chromaticity diagram
On a chromaticity diagram
, the straight line connecting the extreme spectral colors red and violet) is known as the line of purples (or purple boundarylessness); it represents one limit of human color perception (http://en.wikipedia.ora/wiki/Purple).
The search was on for a white backlight lamp having maximum luminance and color coordinates of x = 0.31 [+ or -] 0.02 and y = 0.35 [+ or -] 0.02 per the C.I.E 1931 Chromaticity Diagram
Thresholds that define red-green (RG) and blue-yellow (BY) sensitivity, within the neutral isochromatic zone, are plotted as x, y chromaticity co-ordinates in the CIE chromaticity diagram