Scattering effect of SiO<sub>2</sub>particles on correlated color temperature uniformity of multi-chip white light LEDs

Lai, Min-Feng; Anh, Nguyen Doan Quoc; Ma, Hsin-Yi; Lee, Hsiao-Yi

doi:10.1080/02533839.2015.1117950

Cited by 18 publications

(4 citation statements)

References 8 publications

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“…Lai et al proposed the addition of SiO 2 scattering particles into the phosphor layer of a multi-chip white light LED. The simulation showed that SiO 2 particles could significantly enhance the CCT uniformity and luminous flux [13]. While these methods of improvement have been confirmed by achieving high CCT uniformity, they also engender significant fabrication difficulties for mass production.…”

Section: Introductionmentioning

confidence: 92%

The Effects of TiO2 Diffuser-Loaded Encapsulation on Corrected Color Temperature Uniformity of Remote Phosphor White LEDs

et al. 2019

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With the development of high-efficiency and high-power LEDs, they have become the most energy-efficient and environmentally friendly artificial light source. Phosphor-converted white LEDs are currently mainstream in the market. The remote phosphor is an effective way to enhance the conversion efficiency and lifetime of phosphor-converted LEDs. For applications of high-quality lighting and LCD backlights, the uniformity of angular correlated color temperature (CCT) is very important. This report explored a remote phosphor white LED with low angular CCT variance and high luminous efficiency by using TiO2 diffuser-loaded encapsulation. Experimental results revealed that for the TiO2 diffuser-loaded encapsulation remote phosphor white LED, the angular color uniformity could be improved by 31.82% and the luminous flux by 8.65%. Moreover, the mean CCTs of the TiO2 diffuser-loaded encapsulation and non-diffuser remote phosphor white LEDs were similar at a driving current of 350 mA. Finally, we showed that incorporating the TiO2 diffuser into the phosphor layer of the remote phosphor white LEDs, does not influence the reliability of the LED.

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Section: Introductionmentioning

confidence: 92%

The Effects of TiO2 Diffuser-Loaded Encapsulation on Corrected Color Temperature Uniformity of Remote Phosphor White LEDs

et al. 2019

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“…The efficiency of an LED is directly linked to the light conversion efficiency of phosphors. In order to achieve a higher luminous efficiency and color homogeneity in LEDs, the so-called scattering enhancement particles (SEP), such as SiO 2 , TiO 2 , CaF 2 , and CaCO 3 are routinely added to LED lens [13][14][15][16] (see Figure 1). Scattering agents are often mixed with phosphor particles, and the mixture composite, together with other additives, are added to the plastic lens.…”

Section: Introductionmentioning

confidence: 99%

“…Scattering agents are often mixed with phosphor particles, and the mixture composite, together with other additives, are added to the plastic lens. In this case, phosphor particles have optical functionality, while scattering agents obviously scatter the light to improve the color homogeneity of emitted light [14,[17][18][19]. This paper investigates the idea of combining these functionalities in one multi-functional core-shell nanoparticle in which the shell is a phosphor layer and the core is the scattering agent.…”

Section: Introductionmentioning

confidence: 99%

Towards Multi-Functional SiO2@YAG:Ce Core–Shell Optical Nanoparticles for Solid State Lighting Applications

et al. 2020

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This paper aims to investigate the synthesis, structure, and optical properties of SiO2@YAG:Ce core–shell optical nanoparticles for solid state lighting applications. YAG:Ce phosphor is a key part in white light emitting diodes (LEDs), with its main functionality being the generation of yellow light. Generated yellow light from phosphor will be combined with blue light, emitted from chip, resulting in the generation of white light. Generated light in LEDs will often be scattered by SiO2 nanoparticles. SiO2 nanoparticles are often distributed within the optical window, aiming for a more homogeneous light output. The main idea in this research is to combine these functionalities in one core–shell particle, with its core being SiO2 and its shell being phosphor. In this study core–shell nanoparticles with different Ce3+ concentrations were synthesized by a sol–gel method. Synthesized nanoparticles were characterized by X-ray diffraction (XRD), small angle X-ray scattering (SAXS) analysis, high resolution transmission electron macroscopy (HRTEM), Fourier transform infrared (FTIR), and photoluminescence spectroscopy. Luminescence characteristics of SiO2@YAG:Ce core–shell particles were compared with that of SiO2/YAG:Ce mixture composite, which is now used in commercial LEDs. Obtained results showed that core–shell nanoparticles have comparatively much better optical properties, compared to SiO2/YAG:Ce mixture composite and can therefore be potentially used in LEDs.

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“…To enhance light quality and lumen output, the multiple phosphors or the optical structures of white LED lamps could be optimized. Won et al have demonstrated the strong influence of phosphor geometry on the lumen output of LED lamps with higher color rendering index (CRI) by adding green (Ba,Sr) 2 SiO 4 :Eu 2+ and red CaAlSiN 3 :Eu 2+ phosphors with various phosphor structures to the blue LEDs [4]. Oh et al have proposed G-A-R multi-package LED, which provides higher lumen output and good CRI [5].…”

Section: Introductionmentioning

confidence: 99%

Using Green Emitting Phosphor for Improving Lighting Performance of In-cup Package White LED Lamps

Nhân¹,

Minh²,

Anh³

2017

IJPEDS

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LED technology had a huge development in recent years with major benefits: long-life, high-efficiency, excellent performance, compactness. In this work, an innovative method for improving the performance of multi-chip white LED lamps (MCW-LEDs) by adding the green Ce 0.67 Tb 0.33 MgAl 11 O 19 :Ce,Tb (CeTb) phosphor to their in-cup phosphor compounding is proposed, investigated and demonstrated. Firstly, CeTb was mixed to the incup phosphor package of MCW-LEDs. Then by varying CeTb concentration, lumen output and angular color uniformity (ACU) of MCW-LEDs was calculated and analyzed. The results showed that the lumen output and the ACU of 7000 K and 8500 K MCW-LEDs increased significantly in comparison with others related works. This method is a prospective ideal for future improving LED manufacture.

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Scattering effect of SiO₂particles on correlated color temperature uniformity of multi-chip white light LEDs

Cited by 18 publications

References 8 publications

The Effects of TiO2 Diffuser-Loaded Encapsulation on Corrected Color Temperature Uniformity of Remote Phosphor White LEDs

The Effects of TiO2 Diffuser-Loaded Encapsulation on Corrected Color Temperature Uniformity of Remote Phosphor White LEDs

Towards Multi-Functional SiO2@YAG:Ce Core–Shell Optical Nanoparticles for Solid State Lighting Applications

Using Green Emitting Phosphor for Improving Lighting Performance of In-cup Package White LED Lamps

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Scattering effect of SiO2particles on correlated color temperature uniformity of multi-chip white light LEDs

Cited by 18 publications

References 8 publications

The Effects of TiO2 Diffuser-Loaded Encapsulation on Corrected Color Temperature Uniformity of Remote Phosphor White LEDs

The Effects of TiO2 Diffuser-Loaded Encapsulation on Corrected Color Temperature Uniformity of Remote Phosphor White LEDs

Towards Multi-Functional SiO2@YAG:Ce Core–Shell Optical Nanoparticles for Solid State Lighting Applications

Using Green Emitting Phosphor for Improving Lighting Performance of In-cup Package White LED Lamps

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Scattering effect of SiO₂particles on correlated color temperature uniformity of multi-chip white light LEDs