Enhancing of correlated color temperature uniformity for multi-chip white-light LEDs by adding SiO<sub>2</sub>in phosphor layer

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

doi:10.1080/02533839.2014.981214

Cited by 22 publications

(2 citation statements)

References 7 publications

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“…In this section, we demonstrate the scattering process inside the phosphor compounding by Matlab software using Mie-scattering theory [9,15,16]. In common, the scattering coefficient μsca(λ), anisotropy factor g(λ), and reduced scattering coefficient δsca(λ) are calculated by expression (1), (2), and 3:…”

Section: Physical and Mathematical Modelmentioning

confidence: 99%

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Effect of Green-emitting CaF2:Ce3+,Tb3+ Phosphor Concentration on the Correlated Color Temperature Deviation and the Lumen Output of the 7700 K Conformal Packaging WLEDst

Tin¹,

Minh

Nhân³

et al. 2018

AUSMT

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In this manuscript, we propose a recommendation for improving the correlated color temperature deviation (D-CCT) and the lumen output of 7700 K WLEDs by adding the green-emitting CaF2:Ce 3+ ,Tb 3+ phosphor into the yellowemitting YAG:Ce phosphor compounding. From the research results, the D-CCT could decrease more than 4 times, and the lumen output increased more than 1,5 times in comparison with the non-green-emitting CaF2:Ce 3+, Tb 3+ phosphor case. The results show that green-emitting CaF2:Ce 3+, Tb 3+ phosphor could become a new recommendation for enhancing the D-CCT and the lumen output of WLEDs.

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Section: Physical and Mathematical Modelmentioning

confidence: 99%

“…In recent years, many studies focused on enhancement lighting performance of W-LEDs package with the third approach. In [1,2] [4,5]. However, these research only focus on increasing color uniformity and did not pay much attention to enhancing all luminous flux and color uniformity of WLEDs with high CCT (7700 K).…”

Section: Introductionmentioning

confidence: 99%

Effect of Green-emitting CaF2:Ce3+,Tb3+ Phosphor Concentration on the Correlated Color Temperature Deviation and the Lumen Output of the 7700 K Conformal Packaging WLEDst

Tin¹,

Minh

Nhân³

et al. 2018

AUSMT

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Improving the Angular Color Uniformity and the Lumen Output for White LED Lamps by Green Ce0.67 Tb0.33 MgAl11 O19:Ce,Tb Phosphor

Minh

Nhân

Thảo

2016

AETA 2016: Recent Advances in Electrical Engineering and Related Sciences

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Abstract. In this study, an innovative method for improving the lighting performance of multi-chip white LED lamps (MCW-LEDs) is proposed and demonstrated. By adding the green Ce 0.67 Tb 0.33 MgAl 11 O 19 : Ce,Tb (CeTb) phosphor to the phosphor layer of MCW-LEDs, the quality of emitting light can be enhanced and optimized. Furthermore, the influences of CeTb percentage concentration on the LEDs display are also investigated. The simulation results demonstrated that the lumen output and the angular color uniformity (ACU) of the conformal package MCW-LEDs having average CCTs of 7000 K and 8500 K can be enhanced significantly by green CeTb phosphor. Furthermore, by using Mie theory the simulation results could be proved and convinced thoroughly. This study shows that the green Ce 0.67 Tb 0.33 MgAl 11 O 19 : Ce,Tb (CeTb) phosphor is the prospective solution for improving optical quality of MCW-LEDs manufacturer.

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Improving the Optical Properties of the 8500 K In-cup Packaging WLEDs by Using the Green-emitting CaF 2 :Ce 3+ , Tb 3+ Phosphor

Minh

2017

Lecture Notes in Electrical Engineering

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Enhancing of correlated color temperature uniformity for multi-chip white-light LEDs by adding SiO₂in phosphor layer

Cited by 22 publications

References 7 publications

Effect of Green-emitting CaF2:Ce3+,Tb3+ Phosphor Concentration on the Correlated Color Temperature Deviation and the Lumen Output of the 7700 K Conformal Packaging WLEDst

Effect of Green-emitting CaF2:Ce3+,Tb3+ Phosphor Concentration on the Correlated Color Temperature Deviation and the Lumen Output of the 7700 K Conformal Packaging WLEDst

Improving the Angular Color Uniformity and the Lumen Output for White LED Lamps by Green Ce0.67 Tb0.33 MgAl11 O19:Ce,Tb Phosphor

Improving the Optical Properties of the 8500 K In-cup Packaging WLEDs by Using the Green-emitting CaF 2 :Ce 3+ , Tb 3+ Phosphor

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Enhancing of correlated color temperature uniformity for multi-chip white-light LEDs by adding SiO2in phosphor layer

Cited by 22 publications

References 7 publications

Effect of Green-emitting CaF2:Ce3+,Tb3+ Phosphor Concentration on the Correlated Color Temperature Deviation and the Lumen Output of the 7700 K Conformal Packaging WLEDst

Effect of Green-emitting CaF2:Ce3+,Tb3+ Phosphor Concentration on the Correlated Color Temperature Deviation and the Lumen Output of the 7700 K Conformal Packaging WLEDst

Improving the Angular Color Uniformity and the Lumen Output for White LED Lamps by Green Ce0.67 Tb0.33 MgAl11 O19:Ce,Tb Phosphor

Improving the Optical Properties of the 8500 K In-cup Packaging WLEDs by Using the Green-emitting CaF 2 :Ce 3+ , Tb 3+ Phosphor

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Enhancing of correlated color temperature uniformity for multi-chip white-light LEDs by adding SiO₂in phosphor layer