Enhancement of luminous efficacy for LED lamps by introducing polyacrylonitrile electrospinning nanofiber film

Tang, Yong; Li, Zhi; Liang, Guanwei; Li, Jiasheng; Yu, Binhai

doi:10.1364/oe.26.027716

Cited by 30 publications

(33 citation statements)

References 26 publications

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“…In addition, by applying the Mie theory, the scattering cross section Csca for spherical particles can be calculated with the following expression. The transmitted light power can be measured by the Lambert-Beer law [22] as shown in (6). In which I0 is the incident light power, L is the thickness of phosphor layer (mm) and µext is the extinction coefficient, which can be expressed as: µext = Nr.Cext, where Nr is as the number density distribution of particles (mm -3 ).…”

Section: Resultsmentioning

confidence: 99%

“…Therefore, WLEDs can possibly participate in solid-state lighting should their lumen efficacy is improved [5]. The conformal coating method is proposed to supports color uniformity and leads to the uniformity of angular-dependent correlated color temperature (CCT) [6], but the light loss from backscattering effect prevents it from becoming the optimal solution. In attempts to achieve the higher luminescence for WLEDs to meet the lighting standard of solid- [7][8][9][10][11][12], a reflection structure that has an interior phosphor coating on polymer hemispherical shell lens to boost extraction efficiency, an air-gap embedded structure to boost luminous efficacy by reflecting downward light.…”

Section: Introductionmentioning

confidence: 99%

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MgCeAl11O19:Tb3+ and Mg8Ge2O11F2:Mn4+ in enhancing the color quality of remote phosphor LED

Thi

That

2021

TELKOMNIKA

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As the name infers, the triple-layer remote phosphor (TRP) has 3 phosphor layers includes the red Mg8Ge2O11F2:Mn 4+ phosphor layer on the top, the green MgCeAl11O19:Tb 3+ phosphor layer in the middle, and the yellow YAG:Ce 3+ layer at the bottom and is mentioned as a solution to increase the chromaticity and luminescence adequacy of the white LEDs (WLEDs) in this article. As to control the red light for higher value achieve in the color rendering index (CRI), using red Mg8Ge2O11F2:Mn 4+ phosphor in the TRP structure is recommended. All the outcomes indicate that when red phosphor Mg8Ge2O11F2:Mn 4+ concentration grows the CRI gets higher values, and drastically declines when the concentration of green phosphor MgCeAl11O19:Tb 3+ increases. As the same time, applying the green MgCeAl11O19:Tb 3+ phosphor layer to manage the green light as it can make the luminous efficacy (LE) of WLEDs increase. In particular, the index of LE can also be improved over 40% by limiting the scatter of light and putting in green light. Moreover, to preserve the average correlated color temperature (ACCT) stable at 8500K, the yellow YAG:Ce 3+ concentration must be cut down as the concentration of red and green phosphor rise.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

MgCeAl11O19:Tb3+ and Mg8Ge2O11F2:Mn4+ in enhancing the color quality of remote phosphor LED

Thi

That

2021

TELKOMNIKA

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“…In present, the most popular approach for white light generation is combining the chromatic lights from the LED chips and phosphor layer in WLED structure together. Even though this method is cheap and easy to apply, it is undeniable that the LEDs structures and phosphor layers arrangement are the deciding factors TELKOMNIKA Telecommun Comput El Control  The application of green YPO4:Ce 3+ ,Tb 3+ and red LiLaO2:Eu 3+ layers to... (My Hanh Nguyen Thi) 3217 to WLED performance in light output and redering ability, which this method cannot fully adapt [4][5][6][7][8]. In order to produce LEDs, many common phosphor coating methods have been offered including dispensing coating and conformal coating [9,10].…”

Section: Introductionmentioning

confidence: 99%

The application of green YPO4:Ce3+,Tb3+ and red LiLaO2:Eu3+ layers to remote phosphor LED

2020

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Remote phosphor structure is commonly limited in color quality, but has greater luminous flux when comparing to structures with in-cup or conformal coating. From this dilemma, various researches with advance modifications have been proposed to perfect the chromatic performance of remote structure. In this research, we reach higher color quality by obtaining better values in quality indcators such as color rendering index (CRI) and color quality scale (CQS) with the dual-layer phosphor in our remote white light-emitting diodes (WLEDs). The idea is to ultize WLEDs with 7000 K correlated color temperature (CCT) and create dual-layer configuration with yellow phosphor YAG:Ce 3+ under green phosphor YPO4:Ce 3+ ,Tb 3+ or red phosphor LiLaO2:Eu 3+. After that, we search for suitable concentration of LiLaO2:Eu 3+ for addition in order to acquire the finest color quality. The result shows that WLED with LiLaO2:Eu 3+ has better CRI and CQS as the higher the concentration of LiLaO2:Eu 3+ , the larger CRI and CQS due to increased light scattered in WLEDs. Meanwhile, the green phosphor layer YPO4:Ce 3+ ,Tb 3+ give advantages to luminous flux. However, the reduction in luminous flux and color quality occurs when the concentration of LiLaO2:Eu 3+ and YPO4:Ce 3+ ,Tb 3+ over increase. Results are verified by Mie theory and Beer's Law and can be applied to practical manufacturing of high quality WLEDs.

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“…With many advantages, white light-emitting diodes (WLEDs) is the new light source that begins to replace conventional lighting solutions in daily lighting, backlighting and automatic lighting [1][2][3]. Conjugating GaN LED chip with Y3Al5O12:Ce 3+ (YAG:Ce 3+ ) yellow phosphor and let the light emitted from these two sources merge and create white light is the most commonly used technique to fabricate WLEDs.…”

Section: Introductionmentioning

confidence: 99%

LaSiO3Cl:Ce3+,Tb3+ and Mg2TiO4:Mn4+: quantum dot phosphors for improving the optical properties of WLEDs

Loan

Anh

2020

IJECE

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In this research, we focus on the solutions to enhance the lighting properties as well as the heat regulation of the white light-emitting diodes (WLEDs) with conventional phosphor and quantum dots (QDs). Although receiving lots of attention for being an innovative lighting solution with good color rendering index, the potentials of WLEDs conjugated with quantum dots (QDS), especially the QDs-phosphor mixed nanocomposites ones, are restrained due to the lacking performance in the aspects mentioned above. The crucial requirement to produce better WLEDs is finding solutions that improve the lacking aspects, therefore, through observing previous studies and applying advanced technique, this research suggest an effective and unique packaging configuration, in which the nanocomposites QDs-phosphor layer is set horizontally to the WLED. This novel packaging configuration allow WLED performance in terms of lighting and heating to reach it peaks. This is the first time four different types of WLEDs, single-layer phosphor, dual-layer remote phosphor with yellow-red and yellow-green, and triple-layer phosphor, were simulated, utilized and compared in one study to decide the best WLED configuration. The results show that the triple-layer phosphor configurations improve the color rendering ability and lumen output better than the other configurations.

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Enhancement of luminous efficacy for LED lamps by introducing polyacrylonitrile electrospinning nanofiber film

Cited by 30 publications

References 26 publications

MgCeAl11O19:Tb3+ and Mg8Ge2O11F2:Mn4+ in enhancing the color quality of remote phosphor LED

MgCeAl11O19:Tb3+ and Mg8Ge2O11F2:Mn4+ in enhancing the color quality of remote phosphor LED

The application of green YPO4:Ce3+,Tb3+ and red LiLaO2:Eu3+ layers to remote phosphor LED

LaSiO3Cl:Ce3+,Tb3+ and Mg2TiO4:Mn4+: quantum dot phosphors for improving the optical properties of WLEDs

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