A universal, easy-to-apply light-quality index based on natural light spectrum resemblance

Jou, Jwo‐Huei; Chou, Kun-Yi; Yang, Fu-Chin; Agrawal, Abhishek; Chen, Sun-Zen; Tseng, Jing-Ru; Lin, Cheng-Yao; Chen, Po‐Wei; Wong, Ken‐Tsung; Chi, Yun

doi:10.1063/1.4879635

Cited by 29 publications

(22 citation statements)

References 26 publications

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“…In 2014, Jou's research group offered a natural light spectrum resemblance index (SRI) to enumerate the superiority of a given light source. [16] The proposed index is based on a direct comparison of the luminous spectrum, instead of power spectrum, determined for the given light with that of the easy-toaccess blackbody radiation at the same color temperature. The SRI of a given light source is calculated on the basis of the following equation: SRI = x100 % …… (7) where L BR (λ,T) is the luminance spectrum of the blackbodyradiation and L(λ,T) is the coinciding zone between the luminance spectra of the considered light source and its analogous blackbody-radiation.…”

Section: Light Quality Index-srimentioning

confidence: 99%

P‐145: Blue Light Hazards and Methods of Quantification

Jou

Dubey

Swayamprabhaa

2019

Symp Digest of Tech Papers

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Section: Light Quality Index-srimentioning

confidence: 99%

P‐145: Blue Light Hazards and Methods of Quantification

Jou

Dubey

Swayamprabhaa

2019

Symp Digest of Tech Papers

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“…Jou et al . 10 reported in 2014 a natural light spectrum resemblance index, SRI, to quantify the quality of a given light source. The obtained power spectrum of a light source is first converted to the luminance spectrum.…”

Section: Theoreticalmentioning

confidence: 99%

“…For example, the long applied low-pressure sodium lamp could be given a negative CRI of “−12” 9 . To respond to the call for a new and appropriate light quality metric by DOE, Jou’s group had developed a lighting metric, namely spectrum resemblance index, SRI, which quantitatively defines the quality of any given light from a 0 to 100 scale 10 . To realize a high CRI or SRI, emission in the visible region should be as broad as possible.…”

Section: Introductionmentioning

confidence: 99%

High light-quality OLEDs with a wet-processed single emissive layer

Singh

Jou

Sahoo

et al. 2018

Sci Rep

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High light-quality and low color temperature are crucial to justify a comfortable healthy illumination. Wet-process enables electronic devices cost-effective fabrication feasibility. We present herein low color temperature, blue-emission hazards free organic light emitting diodes (OLEDs) with very-high light-quality indices, that with a single emissive layer spin-coated with multiple blackbody-radiation complementary dyes, namely deep-red, yellow, green and sky-blue. Specifically, an OLED with a 1,854 K color temperature showed a color rendering index (CRI) of 90 and a spectrum resemblance index (SRI) of 88, whose melatonin suppression sensitivity is only 3% relative to a reference blue light of 480 nm. Its maximum retina permissible exposure limit is 3,454 seconds at 100 lx, 11, 10 and 6 times longer and safer than the counterparts of compact fluorescent lamp (5,920 K), light emitting diode (5,500 K) and OLED (5,000 K). By incorporating a co-host, tris(4-carbazoyl-9-ylphenyl)amine (TCTA), the resulting OLED showed a current efficiency of 24.9 cd/A and an external quantum efficiency of 24.5% at 100 cd/m2. It exhibited ultra-high light quality with a CRI of 93 and an SRI of 92. These prove blue-hazard free, high quality and healthy OLED to be fabrication feasible via the easy-to-apply wet-processed single emissive layer with multiple emitters.

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“…Da Pos and Pietto outlined two indexes evaluating the influence that light has on the perception of objects . The Spectrum Resemblance Index (SRI) is based on a direct comparison of the lumen rating of the light source with the blackbody radiation at the same colour temperature, rather than the spectral power distribution .…”

Section: Introductionmentioning

confidence: 99%

The effect of lighting changes on simultaneous colour contrast: a new aspect of colour rendition

Rizzi

Bonanomi

Blaso

et al. 2018

Coloration Technology

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Among the many metrics used to compute the colour rendition of a light source which have been investigated in recent years, most consider only the spectral power distribution of the light source being tested. To highlight aspects not usually considered in the development of colour rendition metrics, and to propose future directions for alternative approaches consistent with human visual perception, an experiment was conducted to examine colour appearance variations on certain spatial visual content configurations, in other words the effects of illusions under different light sources. Results indicate that stronger simultaneous contrast configurations have a more unpredictable variation in appearance. Therefore, it is proposed that colour spatial distribution should be considered for the future generation of rendering metrics.

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A universal, easy-to-apply light-quality index based on natural light spectrum resemblance

Cited by 29 publications

References 26 publications

P‐145: Blue Light Hazards and Methods of Quantification

P‐145: Blue Light Hazards and Methods of Quantification

High light-quality OLEDs with a wet-processed single emissive layer

The effect of lighting changes on simultaneous colour contrast: a new aspect of colour rendition

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