Synthesis and photoluminescence properties of Sr4La(PO4)3O:RE3+(RE=Eu/Tb/Ce) phosphors

Ju, Cheng; Zhang, Jia; Zhang, Hongchao; Sardar, Maryam; Bian, Xintian; Shen, Zhonghua; Ni, Xiaowu; Lü, Jian

doi:10.3788/col201715.121602

Cited by 15 publications

(12 citation statements)

References 23 publications

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“…In (1), the N(r) is the amount of diffusive molecule (mm 3 ), also known as diffusion density distribution. Csca stands for scattering cross section (mm 2 ).…”

Section: Analyzation On the Scattering Effectmentioning

confidence: 99%

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The influences of calcium fluoride and silica particles on improving color homogeneity of WLEDs

2020

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The LEDs lighting device with phosphor ingredient (pcLEDs) is among the most common lighting methods in recent years and evaluated by chromatic uniformity and lighting capacity. Therefore, we introduce the phosphor particles that can improve the scattering efficiency (SEPs) to apply in pcLEDs at 8500 K correlated color temperature (CCT) with the expectation to produce better pcLEDs by enhancing both quantity and quality of emitted light.Combining various materials such as CaF2 and SiO2 with yellow Y3Al5O12:Ce 3+ phosphor composition in the pcLEDs simulation created by the LightTools program is the mechanism of this research. The simulated pcLEDs are tested and the results will be verified with Mie-scattering theory. The observation of the simulation leads to the conclusion about the scattering coefficients of SEPs at 455 nm and 595 nm wavelengths. The calculation showed that CaF2 is better for color homogeneity yet suffer from luminous flux deficiency as the concentration gets higher. On the other hand, SiO2 is the scattering enhancement material that can maintain high luminous flux regardless of its concentration.

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“…In (1), the N(r) is the amount of diffusive molecule (mm 3 ), also known as diffusion density distribution. Csca stands for scattering cross section (mm 2 ).…”

Section: Analyzation On the Scattering Effectmentioning

confidence: 99%

“…To improve the WLED quality, color homogeneity, luminous flux, and color rendering index are the focus points, despite the fact that these criteria can induce inner scattering of WLED [1][2][3][4][5]. A conventional method to create a pcLEDs is to combine the yellow Y3Al5O12:Ce 3+ phosphor with the silicone glue.…”

Section: Introductionmentioning

confidence: 99%

The influences of calcium fluoride and silica particles on improving color homogeneity of WLEDs

2020

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“…A phosphor-in-glass comprised of SiO2, B2O3, PbO, Y3Al5O12:Ce 3+ phosphors, and the silicone is applied to lessen the variance of 6000 K average correlated color temperature (CCT) from 761 K to 171 K [5]. Another method introduced to minimize the color deviation is the HfO2/SiO2 DBR film whose result was the reduction from 1758 K to 280 K at around 5000 K CCT [6]. Besides that, the remote micro-patterned phosphor film could reduce the color deviation by 441 K at an ACCT of 5537 K [7].…”

Section: Introductionmentioning

confidence: 99%

Utilizing CaCO3, CaF2, SiO2, and TiO2 phosphors as approaches to the improved color uniformity and lumen efficacy of WLEDs

2021

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The two elements that are most favorable in the quality evaluation for phosphor-converted LEDs (pcLEDs) these days are the chromatic homogeneity and the lumen output. In this study, a thorough research on enhancing color uniformity and luminous flux of pcLEDs that have a high correlated color temperature (CCT) of 8500K is carried out. The scattering enhancement particles (SEPs): CaCO3, CaF2, SiO2, and TiO2 are used to accomplish the goal by adding them to a yellow phosphor compounding Y3Al5O12:Ce 3+ , and comparing their characteristics afterwards. LightTools program is used to build an optical simulation and Mie-scattering theory helps to examine the achieved results. Specifically, the parameters included in SEPs' scattering calculation are the scattering coefficients, the anisotropic scattering, the reduced scattering, and the scattering amplitudes at 455 nm and 595 nm. The outcomes presented that compared to other SEPs, TiO2 particles can yield the highest chromatic homogeneity. However, the lumen output reduces considerably as TiO2 concentration greatly increases while it can be bettered when using SiO2 particles with any particle size. For CaCO3 particles, the color deviation of 620 K CCT can be reduced with 30% concentration, leading to the recommendation of using CaCO3 to promote the CCT homogeneity and luminescence efficiency.

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“…For the method to install QDs into pc-LEDs, there are two ways suggested. The first one is mixing QDs and phosphor-silicone gel and put them over the LED chips' surface, such as the mixed structure [17,18]. In this design, the reflection cup is filled with the QDs and placed closely to the LED chip, leading to the high optical energy density pressing on QDs.…”

Section: Introductionmentioning

confidence: 99%

Acquiring higher lumen efficacy and color rendering index with green NaYF4:Er3+Yb3+ and red α-SrO·3B2O3:Sm2+ layers for designing remote phosphor LED

Thi

Loan

Anh³

2020

TELKOMNIKA

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Lighting devices that apply diodes to create white light-emitting diodes (WLEDs) can achieve remarkable results in color quality, especially those containing quantum dots (QDs) and phosphor. The technique to create an appropriate package is providing spaces between the QDs and phosphor components which helps decrease the ratio of the reabsorption losses and keeps the QDs surface ligands constant. The research aims to perfect the constructing method of remote phosphor configuration containing quantum dots and phosphor materials that based on lighting properties and temperature feature of WLEDs. The infrared thermography is the tool to measure and analyze total emitted light and emission ranges of the device. This device is also used in temperature simulation and experimental verification. At the given mA of 60, the WLEDs structure with green QDs layer above the phosphor layer results in 996 lm luminous flux (LF), and Ra = 57 in color rendering ability. Meanwhile, luminous flux of WLEDs with red QDs-on-phosphor structure is 632, and Ra = 70. Furthermore, comparing with the green QDs-onphosphor type, the red QDs-on-phosphor type emitted less LF. However, the red QDs-on-phosphor type can be the most effective package design to achieve color rendering ability.

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Synthesis and photoluminescence properties of Sr4La(PO4)3O:RE3+(RE=Eu/Tb/Ce) phosphors

Cited by 15 publications

References 23 publications

The influences of calcium fluoride and silica particles on improving color homogeneity of WLEDs

The influences of calcium fluoride and silica particles on improving color homogeneity of WLEDs

Utilizing CaCO<sub>3</sub>, CaF<sub>2</sub>, SiO<sub>2</sub>, and TiO<sub>2</sub> phosphors as approaches to the improved color uniformity and lumen efficacy of WLEDs

Acquiring higher lumen efficacy and color rendering index with green NaYF4:Er3+Yb3+ and red α-SrO·3B2O3:Sm2+ layers for designing remote phosphor LED

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