Calculating correlated color temperatures across the entire gamut of daylight and skylight chromaticities

Hernández‐Andrés, Javier; Lee, Raymond L.; Romero, Javier

doi:10.1364/ao.38.005703

Cited by 172 publications

(69 citation statements)

References 14 publications

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“…The reference source used for the CRI calculation is not given in the CIE definition. To choose the appropriate illuminant, we first calculate the Correlated Color Temperature (CCT) (according to reference [22]) of our White OLED. The reference source used for the CRI calculation is then the black body at this temperature if the CCT is less than 5500K, and the D65 Daylight illuminant otherwise.…”

Section: Methodsmentioning

confidence: 99%

Doped and non-doped organic light-emitting diodes based on a yellow carbazole emitter into a blue-emitting matrix

et al. 2007

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A new carbazole derivative with a 3,3'-bicarbazyl core 6,6'-substituted by dicyanovinylene groups (6,6'-bis(1-(2,2'-dicyano)vinyl)-N,N'-dioctyl-3,3'-bicarbazyl; named (OcCz2CN) 2 , was synthesized by carbonyl-methylene Knovenagel condensation, characterized and used as a component of multilayer organic light-emitting diodes (OLEDs). Due to its π-donor-acceptor type structure, (OcCz2CN) 2 was found to emit a yellow light at λ max =590 nm (with the CIE coordinates x=0.51; y = 0.47) and was used either as a dopant or as an ultra-thin layer in a blue-emitting matrix of 4,4'-bis(2,2'-diphenylvinyl)-1,1'-biphenyl (DPVBi). DPVBi (OcCz2CN) 2 -doped structure exhibited, at doping ratio of 1.5 weight %, a yellowish-green light with the CIE coordinates (x = 0.31; y = 0.51), an electroluminescence efficiency η EL =1.3 cd/A, an external quantum efficiency η ext = 0.4 % and a luminance L= 127 cd/m 2 (at 10 mA/cm 2 ) whereas for non-doped devices utilizing the carbazolic fluorophore as a thin neat layer, a warm white with CIE coordinates (x = 0.40; y= 0.43), η EL = 2.0 cd/A, η ext = 0.7 %, L = 197 cd/m 2 (at 10 mA/cm 2 ) and a color rendering index (CRI) of 74, were obtained. Electroluminescence performances of both the doped and non-doped devices were compared with those obtained with 5,6,11,12-tetraphenylnaphtacene (rubrene) taken as a reference of highly efficient yellow emitter..

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Section: Methodsmentioning

confidence: 99%

Doped and non-doped organic light-emitting diodes based on a yellow carbazole emitter into a blue-emitting matrix

et al. 2007

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“…The first one, the approach of McCamy, and the calculation of CCT value from xy coordinates for McCamy's approach is shown in Equation 9 and 10 [12]. (10) Another approach for CCT transformation is Hernandez's method [10]. These two approaches are performed in the light of several assumptions.…”

Section: Environment Adaptive Lighting Systemmentioning

confidence: 99%

Environment Adaptive Lighting Systems for Smart Homes

Catalbas

2017

Adv. Sci. Technol. Res. J.

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In this work, an application of adaptive lighting system is proposed for smart homes. In this paper, it is suggested that, an intelligent lighting system with outdoor adaptation can be realized via a real fisheye image. During the implementation of the proposed method, the fuzzy c-means method, which is a commonly used data clustering method, has been used. The input image is divided into three different regions according to its brightness levels. Then, the RGB image is converted to CIE 1931 XYZ color space; and the obtained XYZ values are converted to x and y values. The parameters of x and y values are shown in CIE Chromaticity Diagram for different regions in the sky. Thereafter, the coordinate values are converted to Correlated Color Temperature by using two different formulas. Additionally, the conversion results are examined with respect to actual and estimated CCT values.

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“…La ecuación de Mc Camy ajusta correctamente para valores de TCC comprendidos entre 2000 -12500 °K (Hernández-Andrés et al, 1999).…”

Section: Temperatura De Color Correlacionada (Tcc)unclassified

Amabilidad visual: sistemas de sombreado

2016

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Este é um artigo de acesso aberto, licenciado por Creative Commons Atribuição 4.0 Internacional (CC BY 4.0), sendo permitidas reprodução, adaptação e distribuição desde que o autor e a fonte originais sejam creditados.1 CONICET Mendoza -Centro Científico Tecnológico. Av. Ruiz Leal, 5500, Mendoza, Argentina. RESUMEN -La iluminación afecta el comportamiento de las personas y su impresión de los espacios, sin embargo muy poco se ha estudiado respecto de la amabilidad visual de un espacio protegido por sistemas de sombreado (Ruck et al., 2000). El presente trabajo analiza tres aspectos vinculados a este concepto -color, visión exterior y apariencia-en espacios interiores con aventanamientos protegidos por filtros de control solar y cortinas textiles interiores. Su justificación está planteada ante la hipótesis de que la correcta implementación de sistemas de sombreado (filtros de control solar, venecianas, louvers, cortinas) debe incorporar, al actual análisis de usabilidad visual (visibilidad y confort visual), el estudio de la amabilidad visual. Los resultados obtenidos revelan la necesidad de implementar estrategias de sombreado, desde la perspectiva de la amabilidad visual, respetando los principios bioclimáticos de orientación y adecuación a las condiciones climáticas regionales, a través de estudios dinámicos del factor de iluminación.Palabras clave: iluminación natural, sistemas de sombreado, amabilidad visual, apariencia, temperatura de color correlacionada, visión al exterior.ABSTRACT -Lighting affects people's behavior and their impression of the environment, yet very little has been studied regarding the visual amenity of indoor spaces protected by shading systems (Ruck et al., 2000). The present study analyzes three aspects related to this concept -color, outside view, appearance -in indoor spaces with windows shaded with solar films and curtains. Its purpose is justified by the hypothesis that the correct implementation of shading systems (solar control films, venetian blinds, louvers, curtains) should add the study of visual amenity to the current usability analysis (visibility and visual comfort). From the standpoint of visual amenity, the results show the need to implement shading strategies according to bioclimatic principles of façade orientation and adaptation to regional climate conditions, through daylight dynamic studies.

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Calculating correlated color temperatures across the entire gamut of daylight and skylight chromaticities

Cited by 172 publications

References 14 publications

Doped and non-doped organic light-emitting diodes based on a yellow carbazole emitter into a blue-emitting matrix

Doped and non-doped organic light-emitting diodes based on a yellow carbazole emitter into a blue-emitting matrix

Environment Adaptive Lighting Systems for Smart Homes

Amabilidad visual: sistemas de sombreado

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