Combinatorial optimization of the atomic compositions for green-emitting YBO3:Ce3+,Tb3+ and red-emitting YBO3:Ce3+,Tb3+,Eu3+ phosphors using a microplate reader

Yano, Kohei; Takeshita, Satoru; Iso, Yoshiki; Isobe, Tetsuhiko

doi:10.1039/c7ra01356f

Cited by 19 publications

(3 citation statements)

References 53 publications

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“…It has also been accepted that energy absorbed by Ce 3+ can go through Tb 3+ and eventually reach Eu 3+ in their tridoped system. , It means that Eu 3+ ion (the 4f–4f transition of which is parity-forbidden) can be effectively sensitized by Ce 3+ ion (whose 4f–5d transition is parity-allowed). Then, Ce 3+ –(Tb 3+ ) n –Eu 3+ energy transfer has been used to develop a variety of red phosphors with excellent near-UV absorption. − This method has made some contribution to the development of WLEDs as it can provide more efficient red emission; however, white light based on the additional red phosphor will still be caught in the trap of multiple-phase constitutes. Thus, here comes a question: can energy be partly released at Ce 3+ and Tb 3+ (with extra blue and green emissions) to achieve white light?…”

Section: Introductionmentioning

confidence: 99%

White Light Emission and Enhanced Color Stability in a Single-Component Host

Liang

Hong

et al. 2018

ACS Appl. Mater. Interfaces

135

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Eu ion can be effectively sensitized by Ce ion through an energy-transfer chain of Ce-(Tb) -Eu, which has contributed to the development of white light-emitting diodes (WLEDs) as it can favor more efficient red phosphors. However, simply serving for WLEDs as one of the multicomponents, the design of the Ce-(Tb) -Eu energy transfer is undoubtedly underused. Theoretically, white light can be achieved with extra blue and green emissions released from Ce and Tb. Herein, the design of the white light based on these three multicolor luminescence centers has been realized in GdBO. It is the first time that white light is generated via accurate controls on the Ce-(Tb) -Eu energy transfer in such a widely studied host material. Because the thermal quenching rates of blue, green, and red emissions from Ce, Tb, and Eu, respectively, are well-matched in the host, this novel white light exhibits superior color stability and potential application prospect.

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Section: Introductionmentioning

confidence: 99%

White Light Emission and Enhanced Color Stability in a Single-Component Host

Liang

Hong

et al. 2018

ACS Appl. Mater. Interfaces

135

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“…This lack of past works can be explained by that combinatorial methods, when applied to conventional searches like the search for white light LEDs, usually converge to known phosphors . In addition, the analysis methods used for combinatorially synthesized libraries of luminescent materials are often limited to (color-filtered) charge-coupled device (CCD) photography of a library under UV illumination, − substrate-scanning with color filters to isolate emission peaks, , or cathode luminescence with no information on low energy excitations . These coarse characterizations still have to be followed by powder synthesis to fully analyze the luminescent properties of a material of interest.…”

Section: Introductionmentioning

confidence: 99%

Method for the Detailed Characterization of Cosputtered Inorganic Luminescent Material Libraries

Merkx

Kolk

2018

ACS Comb. Sci.

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Understanding the behavior of combinatorially developed luminescent materials requires detailed characterization methods that have been lacking thus far. We developed a device for directly surveying the luminescent properties of thin-film libraries created through combinatorial gradient sputter deposition. Step-scan recorded excitation-, emission- and luminescence decay spectra of a thin-film library were resolved and combined with EDX measurements on the same film, relating composition to luminescent properties. This technique was applied to a single-substrate gradient thin-film library of NaBr0.73I0.27 to NaBr0.09I0.91, doped with 6.5% to 16.5% Eu2+. This gradient film closely followed Vegard’s law, with emission fluently shifting from 428 to 439 nm. In comparison, pure NaBr:Eu2+ showed emission at 428 nm and NaI:Eu2+ at 441 nm. Luminescence decay measurements demonstrated a great degree of concentration quenching in the gradient film. From these measurements we could conclude that an optimized phosphor would most efficiently luminesce when close to NaI:Eu2+. This gradient film confirmed that the method presented in this work allows to both study and optimize luminescent behavior in a broad range of host- and dopant systems.

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“…Threequarters of these locations are non-centrosymmetric with C2 symmetry and the rest one quarter is centrosymmetric with S 6 symmetry. It should be noted that YBO 3 compound crystallizes in different structures with different space groups and symmetries [8,9]. In the monoclinic YBO 3 host lattice, two kinds of Y 3+ ions with C1 and Ci crystal symmetries have been reported [7].…”

Section: Introductionmentioning

confidence: 99%

The luminescence properties of yttria based phosphors and study of YBO3 formation via H3BO3 addition

Rafiaei

2018

PAC

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In this paper, Y 2 O 3 :Eu 3+ nano-phosphor was synthesized through the facile solid-state method and influence of H 3 BO 3 addition to the prepared Y 2 O 3 :Eu 3+ powder was investigated. The consumption of boric acid resulted in the formation of YBO 3 by changing the crystal structure from cubic to hexagonal. Noteworthy, through the use of specific quantities of H 3 BO 3 (medium amount), Y 3 BO 6 impurity with the monoclinic crystal structure and the space group C2/m was formed. FESEM observations showed that the addition of H 3 BO 3 leads to the coarsening of the synthesized particles; changing from approximately 80 nm to 1 µm. Also, it was concluded that the transformation of the crystal structure causes a dramatic change of phosphor emission colours from reddish to orange.

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Combinatorial optimization of the atomic compositions for green-emitting YBO₃:Ce³⁺,Tb³⁺ and red-emitting YBO₃:Ce³⁺,Tb³⁺,Eu³⁺ phosphors using a microplate reader

Abstract: Compositions of green-emitting Y1−x−yCexTbyBO3 and red-emitting Y1−x−y−zCexTbyEuzBO3 were optimized by photoluminescence intensity of each microplate-well by using a microplate reader.

Cited by 19 publications

References 53 publications

White Light Emission and Enhanced Color Stability in a Single-Component Host

White Light Emission and Enhanced Color Stability in a Single-Component Host

Method for the Detailed Characterization of Cosputtered Inorganic Luminescent Material Libraries

The luminescence properties of yttria based phosphors and study of YBO3 formation via H3BO3 addition

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