Diffractive CIE 1931 chromaticity diagram

Abstract

A novel diffractive CIE 1931 chromaticity diagram is generated by utilizing surface relief gratings on a plastic sample. A properly illuminated sample is shown to reflect the CIE chromaticity diagram with exact colors and large gamut. Additive color mixing is accomplished by utilizing the four main peaks of a 4000 K fluorescent lamp's spectrum as the primary colors. The primary grating units are reflecting the combination of the primary colors to the desired viewing angle and thereby forming the correct chromaticity (x, y) at each pixel of chromaticity diagram. Weights of primary colors at each pixel of the diagram are controlled by fixing the relative areas of the primary gratings. The master grating is fabricated with aid of electron beam lithography. The final grating is hot embossed on a polycarbonate sample using an electroplated nickel shim. Chromaticity values are measured from the plastic sample by a spectroradiometer.

Synthesis of Light‐Diffracting Assemblies from Microspheres and Nanoparticles in Droplets on a Superhydrophobic Surface

“…The wavelength, l, of the specific spot on a colored ring is estimated by comparing circular spots of 10 pixel diameter from the colored rings in the optical micrograph of the opal ball to the standard Commission internationale de l'é clairage (CIE) 1931 chromaticity diagram. [42] The variable d is the interplanar spacing for the colloidal crystal. The latex particles in the opal balls are arranged in the form of a facecentered cubic (FCC) lattice with the (111) plane parallel to the outer interface.…”

Effect of Eu3+ doping on the structural, optical, and photoluminescent properties of LiGa5O8 phosphor

“…The chromaticity coordinates “ x ” and “ y ” were calculated using tristimulus values X , Y , and Z , which denote the primary colors red, green, and blue, respectively, in eqn (11). 54 In both cases shown in Fig. 14, the photonic emission color was observed to lie in the red region for both excitations.…”

Optically Readable Electrochromic-Based Microfiber Synaptic Device for Photonic Neuromorphic Systems

“…Because no color change is observed within the voltage range from 0 to 2.2 V, the figure shows different shades of blue in the initial state (0 V) and at different voltages values from 2.3 to 2.7 V. Figure 1d displays the chromaticity diagram of the synaptic devices at different voltages, along with the local magnification and the color coordinates of each point in the diagram (Table S1 in Supporting Information). As can be seen, the gradual increase in the Z value with the increase in voltage implies a gradual deepening of the electrolyte's blue color, which is consistent with the theoretical analysis, 33 and the phenomenon observed by the naked eye. The multimode optical fiber was also gradually thinned to microfiber by the flame heating and stretching procedures, and Figure 1e shows the optical microscopy photos of fiber before and after it was stretched, with diameter values of 125.0 and 15.9 μm, respectively.…”