Recyclable phosphor sheet based on polyvinyl alcohol for LED lighting using remote phosphor technology

Hämmer, Matthias; Gassmann, Andrea; Reller, Armin; Seggern, Heinz von; Gutfleisch, Oliver; Stauber, Rudolf; Zimmermann, J.

doi:10.1080/10667857.2018.1541213

Cited by 6 publications

(4 citation statements)

References 21 publications

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“…We compressed the testing portions of powder and subjected them to excitation at an incidence angle of 45 o . To have the green-phosphor CaLa:EM, its essential chemical components and creation process are presented in Table 1 Photomultiplier of the form Hamamatsu Photonics R928 at 90 0 angle to the stimulation ray Time-resolved measurements Adjustable nanosecond optical-parametric-oscillator/Q-switch-pumped YAG:Nd 3+ laser formation (NT341/1/UV, Ekspla) Radiation transients Obtained using nanochromater (ARC's SpectraPro300i), detected using a photomultiplier tube (R928HA, Hamamatsu), linked to a digital oscilloscope (LT372, LeCrop) as well as transmitted towards a computer to study kinetics [9], [10] We created WLED lightings via combining clear silicon resin with phosphor mixture of CaLa:EM along with BaMgAl 10 O 17 :Eu 2+ above an ultraviolet chip (AOT Product No: DC0004CAA, Spec: 370U02C, maximum wavelength: 365 ~370 ± 0.6 nm, chip size: 40x40 mil, forward voltage: 3.8 ~4.0 ± 0.02 V, power: 10-20 ± 0.21 mW). All samples had their chromaticity coordinates evaluated by the Commission International de I'Eclairage (CIE).…”

Section: Experimental 21 Preparation Of Green-emitting Cala:em Phosphormentioning

confidence: 99%

Ca9La(PO4)7:Eu2+,Mn2+: a radiation-adjustable phosphor usable for high-perfomance white light-emitting diodes

Huu

That

et al. 2022

IJEECS

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We used solid-condition processes to make a sequence of radiation-adjustable phosphors Eu2+/Mn2+ co-doped Ca9La(PO4)7 (shortened as CaLa:EM), which show a consistently variable hue from green to yellow and red via an efficient resonance-form energy transition as well as the strength of green and red radiations may be controllable through altering the Mn2+concentration. We examined the transition of energy (Eu2+®Mn2+) for CaLa:EM. It is proved to be a resonant kind using a dipole-quadrupole process, having power shift critical range calculated to be 11.36 Å by using the spectral overlap techniques. Mixing a 365 nm UV-InGaN chip as well as one phosphor combination containing (Ca0.98Eu0.005Mn0.015)9La(PO4)7 in yellow with BaMgAl10O17:Eu2+in blue produced a warming WLED having CIE color coordinates measured at (0.35, 0.31), better CRI value (Ra)measured at 91.5 along with smaller CCT value of 4,496 K.

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Section: Experimental 21 Preparation Of Green-emitting Cala:em Phosphormentioning

confidence: 99%

Ca9La(PO4)7:Eu2+,Mn2+: a radiation-adjustable phosphor usable for high-perfomance white light-emitting diodes

Huu

That

et al. 2022

IJEECS

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“…Видно, что в спектрах наблюдаются многочисленные полосы поглощения с максимумами 475, 487, 511, 566, 690, 722 и 787 cm −1 , характерные для кристаллов алюмоиттриевого граната [14,19,20]. Известно [21], что замещение редкоземельными ионами ионов иттрия в кристаллах граната может сопровождаться некоторыми изменениями в тетраэдрических AlO 4 и октаэдрических AlO 6 структурных элементах YAG.…”

Section: экспериментальные результаты и обсуждениеunclassified

“…Известно [21], что замещение редкоземельными ионами ионов иттрия в кристаллах граната может сопровождаться некоторыми изменениями в тетраэдрических AlO 4 и октаэдрических AlO 6 структурных элементах YAG. Данные ИК спектроскопии свидетельствуют о том, что изменение концентрации иттербия в синтезированных порошках не оказывает влияния на положение максимумов наиболее хорошо разрешенных на спектрах полос поглощения при 690, 722 и 787 cm −1 , соответствующих колебаниям химической связи Al−O в тетраэдрических элементах AlO 4 в структуре граната [19,20]. Положение пика поглощения при 566 cm −1 колебаний этой связи в октаэдрических структурных группах AlO 6 [20] [27,28].…”

Section: экспериментальные результаты и обсуждениеunclassified

Полимерно-солевой синтез нанопорошков Yb:YAG и исследование их структуры и люминесцентных свойств

Булыга¹,

Евстропьев²,

Кузьменко³

et al. 2021

Оптика И Спектроскопия

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Experimental results of polymer-salt synthesis of Yb:YAG nanopowders and analysis of their structure and luminescent properties are presented. Infrared absorption spectra of synthesized materials are presented. The results of XRD analysis show that Yb:YAG nanocrystals with sizes of 18-35 nm form at a temperature of 900-1100 °С. The study on photoluminescence spectra and decay curves shows that properties of synthesized powders are close to properties of macroscopic materials produced by traditional high-temperature methods.

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“…Several efforts were made for the purpose of addressing the limitations of the Y2O2S:Eu 3+ red phosphor. When several alkaline earth sulfides were combined with rare-earth ion activators, this combination outperformed Y2O2S:Eu 3+ red phosphors [14]- [16]. However, because of the inefficient moisture resistance and instability to other atmospheric elements, the usage of alkaline earth sulfides has been restricted.…”

Section: Introductionmentioning

confidence: 99%

The effects of silica-coated Y2O2S:Eu3+ red phosphor on the lighting properties of the light-emitting diode

Huu

2022

Bulletin EEI

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The red phosphor Y2O2S:Eu3+ coated with silica (SiO2) nanocomposite was synthesized using the sol-gel method with dip-coating technique. The purpose of coating the poly (methyl methacrylate) (PMMA)-SiO2 composite on Y2O2S:Eu3+ phosphor’s surface is to protect the phosphor and improve its scattering ability. The three primary ingredients of coating composition include methyl methacrylate (MMA) monomer, tetraethyl orthosilicate (TEOS), and SiO2 nanoparticles. Via Mie scattering theory, the scattering of SiO2 is examined, which primarily determines the scattering of PMMA-SiO2-coated Y2O2S:Eu3+. The larger particles of SiO2 in the coating composite leads to better scattering properties. When being applied in the dual-film remote phosphor configuration of a LED, SiO2@Y2O2S:Eu3+ considerably enhances the CRI and the color quality scale (CQS). The highest CRI and CQS can be observed at approximately 85 and 74 with 23 %wt. and 26 %wt. the concentration of SiO2@Y2O2S:Eu3+, respectively. Neverthless, the illuminating beam of the package gradually declines as the concentration of SiO2@Y2O2S:Eu3+ go up, which might be ascribed to excessive scattering occurrences in the double-layer remote package.

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Recyclable phosphor sheet based on polyvinyl alcohol for LED lighting using remote phosphor technology

Cited by 6 publications

References 21 publications

Ca9La(PO4)7:Eu2+,Mn2+: a radiation-adjustable phosphor usable for high-perfomance white light-emitting diodes

Ca9La(PO4)7:Eu2+,Mn2+: a radiation-adjustable phosphor usable for high-perfomance white light-emitting diodes

Полимерно-солевой синтез нанопорошков Yb:YAG и исследование их структуры и люминесцентных свойств

The effects of silica-coated Y2O2S:Eu3+ red phosphor on the lighting properties of the light-emitting diode

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