Colorful radial Talbot carpet at the transverse plane

Rasouli, Saifollah; Hamzeloui, Saeed; Hebri, Davud

doi:10.1364/oe.27.017435

Cited by 20 publications

(9 citation statements)

References 18 publications

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“…Many efforts were made to eradicate or at least limit the light loss from photon entrapment and reabsorption. Some research papers suggested reorganizing the LED configuration [3], [4], others tried to modify the contacting area [5], [6], yet a practical and reliable solution to address the refractive index discrepancy problem has not been found. Lee et al pioneered employing multiple materials with distinct refractive indices to create an innovative encapsulation package with low impact from refractive index contrast [7].…”

Section: Introductionmentioning

confidence: 99%

Using CaCO3-doped package to improve correlated color temperature uniformity of white light-emitting diodes

Thi

Loan

Bui

et al. 2021

IJECE

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The white light-emitting diode (WLED) has been the most advance lighting method currently, however, the fabrication process of this configuration still has drawbacks which negatively affect its color quality. This research was conducted to provide a method for WLED’s lighting output enhancement. Since CaCO3 particles are excellent for thermal stability enhancement, especially when being combined with an adhesive substance, we decided to integrate CO3 particles into resin matrix such as melamine formaldehyde (MF) and investigate their influences on the optical properties, including color uniformity and lumen output, of the WLED. The results showed that CaCO3 and MF resin are beneficial to the light scattering efficiency, which results in higher luminous flux and chromatic quality for WLED packages. In addition to that, the appropriate amounts of MF resin and CaCO3 for reaching the best lumen efficiency and color quality are figured out at 1% and 10%, respectively. Moreover, another advantage of using MF resin and CaCO3 for fabricating WLEDs is cost effectiveness. Hence, it has turned out that CaCO3 and MF resins can be potential materials for next high-quality WLED generations.

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Section: Introductionmentioning

confidence: 99%

Using CaCO3-doped package to improve correlated color temperature uniformity of white light-emitting diodes

Thi

Loan

Bui

et al. 2021

IJECE

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“…In illumination market, WLED devices which use the diodes to create white light have been proved to be the potential generation solid-state lighting source which can probably be an alternate to the conventional fluorescent and incandescent ones, as they perform impressive features including longevity, high efficiency, cost saving, and being eco-friendly [1][2][3][4]. One of the most popular methods to create WLED devices is freely dispensing the yellow phosphor yttrium aluminum garnet (YAG:Ce) onto a blue LED chip [5,6].…”

Section: Introductionmentioning

confidence: 99%

Investigation on the application of ZnO nanostructures to improve the optical performance of white light-emitting diodes

2021

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Though combining blue LED chips with yellow phosphor has been the most common method in white light-emitting diode (WLED) production, the attained angular correlated color temperature (CCT) uniformity is still poor. Thus, this article proposes to add ZnO nanostructures to WLED packages to promote the color uniformity of the WLEDs. The outcomes of the research demonstrate that utilizing ZnO at different amount can affect the scattering energy and the CCT deviations in WLEDs packages in different extents. Particularly, adding the node-like (N-ZnO), sheet-like (S-ZnO), and rod-like (R-ZnO) leads to the corresponding decreases of CCT deviations from 3455.49 K to 96.30 K, 40.03 K, and 60.09 K, respectively. Meanwhile, with 0.25% N-ZnO, 0.75% S-ZnO, and 0.25% R-ZnO, WLED devices can achieve both better CCT homogeneity and lower reduction in luminous flux. The results of this article can be a valuable document for the manufacturer to use as reference in improving their WLED products.

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“…The application of semiconductor nanocrystals or quantum dots (QDs) has been introduced to modify the emission spectra for achieving a reduction in luminescence loss of traditional WLEDs [9]- [13]. The advantage of using QDs is the tunable emission wavelength which is managed by their Bulletin of Electr Eng & Inf ISSN: 2302-9285  Applying SiO2 nano-particles for improving optical properties of WLED conformal and … (Phan Xuan Le) 1915 narrow emission spectra [14], [15], helping the high-power WLED achieve high color rendering index (CRI). However, to fully take advantage of QDs, it must be mixed uniformly with the silicone polymer in the fabricating procedure.…”

Section: Introductionmentioning

confidence: 99%

Applying SiO2 nano-particles for improving optical properties of WLED conformal and in-cup structures

Minh

2021

Bulletin EEI

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This article is the analysis of SiO2 nano-particles’ influences on the luminous efficiency and the color temperature uniformity of a remote phosphor structure in a WLED. The purpose of integrating SiO2 into the silicone layer in the remote phosphor structure is to significantly promote the scattering occurrences. Particularly, with an appropriate proportion of SiO2, there could be more blue lights generated at large angles, leading to reducing the angular-dependent color temperature deviation. The luminous flux also can get benefits from SiO2 addition owing to a proper air-phosphor layer refractive index ratio provided by this SiO2/silicone compound. The attained experimental results were compared with optical values of a non-SiO2 remote phosphor configuration and showed a notable enhancement. The color deviation was reduced by approximately 600 K in the angles from -700 to 700. Additionally, the lumen efficiency was improved by 2.25% at 120 mA driving current. Hence, SiO2 can be used to boost both color uniformity and luminous efficacy for remote-phosphor WLED.

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Colorful radial Talbot carpet at the transverse plane

Cited by 20 publications

References 18 publications

Using CaCO3-doped package to improve correlated color temperature uniformity of white light-emitting diodes

Using CaCO3-doped package to improve correlated color temperature uniformity of white light-emitting diodes

Investigation on the application of ZnO nanostructures to improve the optical performance of white light-emitting diodes

Applying SiO<sub>2</sub> nano-particles for improving optical properties of WLED conformal and in-cup structures

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