Investigating unique hues at different chroma levels with a smaller hue angle step

Bao, Wenyu; Mao, Wei; Xiao, Kaida

doi:10.1364/josaa.383002

Cited by 9 publications

(5 citation statements)

References 26 publications

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“…Specifically, the patterned substrates with an optimized structure of the interface showed the highest value of LEE at 0.85, while the LEE of the roughened interfaces of encapsulation layer showed 12.13% enhancement. However, these results were much lower than that of the original single-chip packages [19][20][21]. For the domed-shaped encapsulation lens method, it possibly yielded better LEE but its size is not compact, and the production cost is also higher due to the large quantity of the encapsulation materials [22,23].…”

Section: Introductionmentioning

confidence: 85%

TiO2/silicone encapsulation film for achieving optical performance improvement of chip-on-board packaging LEDs

Thi

That

2021

TELKOMNIKA

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TiO2 nanoparticle and silicon composite has powerful effect of scattering, thus it is famous in enhancing the scattered light in light-emitting diode (LED) packages. To accomplish higher lighting performance in LED devices, a thin encapsulation layer of TiO2 with high concentration and silicon glue is introduced to complement the main encapsulation one. After conducting experiments, the results present that in the case of the main encapsulation including only silicone, the light extraction efficiency (LEE) of COB LEDs increases to 65%. On the other hand, when there is the additional layer of TiO2 and silicone, the improvement of LEE depends on the concentration of TiO2. As this nanoparticle concentration decreases from 0.12 to 0.035 g/cm 3 , the LEE can be enhanced from 6% to 24%. Moreover, at the average correlated color temperature (CCT) of approximately 8500 K, the layer of TiO2/silicone composite can help to accomplish the reduction of the angular correlated color temperature (CCT) deviation, from 900 to 470 K, within −90° to 90° viewing angle range.

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Section: Introductionmentioning

confidence: 85%

TiO2/silicone encapsulation film for achieving optical performance improvement of chip-on-board packaging LEDs

Thi

That

2021

TELKOMNIKA

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“…The critical distance (Rct) of energy transferring among the ions in the lattice is used to analyze the quenching mechanism of dopant concentration. The Blasse relation is applied to calculate Rct, as expressed in (5) [24],…”

Section: Wled Simulationmentioning

confidence: 99%

Blue-yellow emissive LaAlO3:Dy3+ phosphor for high bright white light-emitting diodes

Tung

Dang

2023

Bulletin EEI

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LaAlO3:Dy3+ (LAO:Dy3+) with blue-yellow emission for brilliant white light of light-emitting diodes (LEDs) was prepared using gel-combustion process. The chemical content of the created material was confirmed using energy dispersive X-ray analysis (EDX). The transmission electron microscopy was used to examine the phosphor crystal size and morphology. The luminescence analysis showed that LAO:Dy3+ phosphors exhibited peaks at 482 nm (blue) and 574 nm (yellow), attributed to the transitions 4F 9/2à6H 15/2 and 4F 9/2à6H 13/2, respectively. The investigating of correlated color temperature (CCT) and Commission International de L'Eclairage (CIE) described that the phosphor LAO:Dy3+ helped to attained good CCT coordination and bright cool-white emission under ultraviolet (UV) stimulation. However, when using in white LED fabrication, the concentration of LAO:Dy3+ should be modified to fulfill the need from manufactures. According to results from this work, the white light luminescence intensity and color rendering performance may be reduced if the LAO:Dy3+ is high (10%) because of too much scattering. On the other hand, such scattering improvements offered by LAO:Dy3+ phosphor is beneficial to reduce the color deviance for better color uniformity of light.

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“…As a result, the 490 nm range of B-G phosphor is a critical matter in the study and setting up of filled-spectrum light emitting diodes (LEDs). Several B-G phosphors, such as silicate (M2SiO4:Eu 2+ , M=Ca, Ba, Sr), sulfide (M2BS4:Eu 2+ , M=Ba, Sr, Ca, B=Al, Ga, In), and aluminate (MSrAl37:Eu 2+ , M=Y, La, Gd) are presently being established [11], [12]. The conventional silicate structure, on the other side, has a limited emission maximum and poor color rendering traditional sulfide phosphors typically have poor stability, sensitivity to surrounding humidity and ambiance, aluminate is hard to compound, expensive, and prone to hydrolysis [13].…”

Section: Introductionmentioning

confidence: 99%

Thermal consequences of sintering the borosilicate matrix blue-green color release properties

Tung,

Nguyen Thi

2023

Bulletin EEI

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Color transformation glass ceramics were produced of borosilicate matrix co-doped (SrBaSm)Si2O2N2:(Eu3+Ce3+) blue–green (B-G) (abbreviated as (SBS)SON:(EuCe) B-G) phosphors using a two-step co-sintering technique. The shift in illumination characteristics and drift of chromaticity coordinates (CIE) of (SBS)SON:(EuCe) (B-G) phosphors and hue transformation glass ceramics were investigated over a 600–800 ºC sintering thermal range. With rising sintering heat, the illuminated strength and inner quantum yield (QY) of (abbreviated as B-G) phosphors and glass ceramics reduced. Once the sintering heat was raised above 750 ºC, the phosphors and hue transformation glass ceramics showed nearly no high point among their luminescence photoluminescence (PL) and photoluminescence excitation (PLE) bands of color. B-G phosphors have low heating steadiness at more elevated temperatures, according to the findings. The glass matrix destructed the phosphors lattice layout and the Ce3+ in the phosphors was oxidized to Ce4+, resulting in a reduction in the luminous characteristics of the color transformation glass ceramics.

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Investigating unique hues at different chroma levels with a smaller hue angle step

Abstract: This is a repository copy of Investigating unique hues at different chroma levels with a smaller hue angle step.

Cited by 9 publications

References 26 publications

TiO<sub>2</sub>/silicone encapsulation film for achieving optical performance improvement of chip-on-board packaging LEDs

TiO<sub>2</sub>/silicone encapsulation film for achieving optical performance improvement of chip-on-board packaging LEDs

Blue-yellow emissive LaAlO<sub>3</sub>:Dy<sup>3+</sup> phosphor for high bright white light-emitting diodes

Thermal consequences of sintering the borosilicate matrix blue-green color release properties

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