Photoluminescence investigation of novel reddish-orange phosphor Li2NaBP2O8:Sm3+ with high CP and low CCT

Exploring outstanding rare-earth activated inorganic phosphors with good thermostability has always been a research focus for high-power white light-emitting diodes (LEDs). In this study, we report a Sm3+-activated KNa4B2P3O13 (KNBP) powder phase. Its particle morphology, photoluminescence properties, concentration quenching mechanism, thermal quenching mechanism, and chromatic properties are demonstrated. Upon the near-ultraviolet (NUV) irradiation of 402 nm, the powder phase exhibits orange-red visible luminescence performance, originating from typical 4G5/2→6HJ/2 (J = 5, 7, 9) transitions of Sm3+. Importantly, the photoluminescence performance has good thermostability, low correlated color temperature (CCT), and high color purity (CP), indicating its promising application in the NUV-pumped warm white LEDs.

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“…Differently, as depicted in the inset of Fig. 5 [23]. Among these absorptions, the 6 H 5/2 → 4 F 7/2 (402 nm) transition is the strongest.…”

Section: Diffuse Reflection Excitation and Emissionmentioning

confidence: 87%

NUV-pumped luminescence of thermally stable samarium-activated alkali metal borophosphate phosphor

et al. 2021

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“…The trivalent Sm 3+ ion, which is of lower cost than Eu 3+ , is an excellent activator with an orange-red emission under nearultraviolet (UV) light excitation owing to Sm 3+ 4f!4f transitions. So far, a number of orange-emitting phosphors have been reported, such as Li 2 NaBP 2 O 8 :Sm 3+ (Xiang et al, 2019), K 5 Y(P 2 O 7 ) 2 :Sm 3+ (Shi et al, 2020) and PbGdB 7 O 13 :Sm 3+ (Zhao et al, 2018b). In this work, we report the synthesis and crystal structure of CsNa 2 Sm 2 (BO 3 )(PO 4 ) 2 .…”

Section: Introductionmentioning

confidence: 99%

Synthesis, crystal structure and luminescence properties of a new samarium borate phosphate, CsNa₂Sm₂(BO₃)(PO₄)₂

et al. 2020

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A new caesium sodium samarium borate phosphate, CsNa2Sm2(BO3)(PO4)2, has been obtained successfully by the high-temperature solution growth (HTSG) method and single-crystal X-ray diffraction analysis reveals that it crystallizes in the orthorhombic space group Cmcm. The structure contains BO3, PO4, NaO7 and SmO7 polyhedra which are interconnected via corner- or edge-sharing O atoms to form a three-dimensional [Na2Sm2(BO3)(PO4)2]∞ network. This network delimits large cavities where large Cs+ cations reside to form the total structure. Under 402 nm light excitation, CsNa2Sm2(BO3)(PO4)2 exhibits three emission bands due to the 4f→4f transitions of Sm3+. Furthermore, we introduced Gd3+ into Sm3+ sites to optimize the Sm3+ concentration and improve the luminescence intensity. The optimal concentration is Gd/Sm = 98/2. The luminescent lifetime of a series of CsNa2Gd2(1–x)Sm2x (BO3)(PO4)2 phosphors shows a gradual degradation of lifetime from 2.196 to 0.872 ms for x = 0.01–0.10. The Commission Internationale de l'Eclairage (CIE) 1931 calculation reveals that CsNa2Gd1.96Sm0.04(BO3)(PO4)2 can emit orange light under 402 nm excitation.

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“…The color purity of the synthesized NPs is 99.82% and the CIE color coordinates, correlated color temperature (CCT), and color purity of the YSZ: x Eu 3+ ( x = 0.01–0.2) phosphors are listed in Table . The YSZ:0.2Eu 3+ nanophosphor has superior color purity compared to commercially available red phosphors Y 2 O 3 :Eu 3+ (0.62, 0.37; 97.1%) and Y 2 O 2 S:Eu 3+ (0.622, 0.351; 92%), as indicated in the inset of Figure (g). , The emitted light is characterized by the CCT supported by eq Here, n is the inverse slope line, …”

Section: Resultsmentioning

confidence: 85%

Rare-Earth Ion-Activated Nanostructured Fluorescent Marker for Easy Naked Eye Detection and Swift Imaging of Latent Fingerprints

Pradhan,

Muddamalla,

Sharma

et al. 2023

ACS Appl. Nano Mater.

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Latent fingerprint (LFP) imaging is critical for crime scene detection and personal data recognition. In law enforcement applications, there is a great need for new materials that are affordable, environmentally friendly, and extremely sensitive. Here, a dual excitable and intense redemitting oxide-based nanophosphor, Y 2 SrZnO 5 :xEu 3+ (x = 0−0.4 mol), was successfully synthesized by a self-igniting combustion technique. The phase purity, crystal structure, and lattice parameters were characterized by powder X-ray diffraction (XRD) using WIN-INDEX (ver. 3.08) software. Scanning electron microscopy (SEM) confirms the surface morphology with a uniform size distribution of ∼250 nm. Upon excitation at 393 and 465 nm, the synthesized nanophosphor exhibited intense red emissions with peaks at 595 and 612 nm and color purity of 99.8% due to the characteristic transitions of Eu 3+ ions from 5 D 0 → 7 F J (J = 0−3). It has a higher external quantum yield (EQY) of 41 and 56% at 393 and 465 nm, respectively, compared to commercial Y 2 O 3 :Eu 3+ , which has an EQY of <1% for these wavelengths. With this result, it became clear that the problem of low absorption in the blue region (450−470 nm) of the commercial red phosphors (Y 2 O 3 :Eu 3+ ) for producing efficient white light-emitting diodes has been solved. The LFPs exhibit specific discrimination features including levels I, II, and III, with high sensitivity and no background hindrance. The results obtained with the synthesized Y 2 SrZnO 5 :0.2Eu 3+ nanophosphor indicate its potential use in detecting and imaging latent fingerprints at crime scenes.

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Photoluminescence investigation of novel reddish-orange phosphor Li2NaBP2O8:Sm3+ with high CP and low CCT

Cited by 65 publications

References 39 publications

NUV-pumped luminescence of thermally stable samarium-activated alkali metal borophosphate phosphor

NUV-pumped luminescence of thermally stable samarium-activated alkali metal borophosphate phosphor

Synthesis, crystal structure and luminescence properties of a new samarium borate phosphate, CsNa₂Sm₂(BO₃)(PO₄)₂

Rare-Earth Ion-Activated Nanostructured Fluorescent Marker for Easy Naked Eye Detection and Swift Imaging of Latent Fingerprints

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Photoluminescence investigation of novel reddish-orange phosphor Li2NaBP2O8:Sm3+ with high CP and low CCT

Cited by 65 publications

References 39 publications

NUV-pumped luminescence of thermally stable samarium-activated alkali metal borophosphate phosphor

NUV-pumped luminescence of thermally stable samarium-activated alkali metal borophosphate phosphor

Synthesis, crystal structure and luminescence properties of a new samarium borate phosphate, CsNa2Sm2(BO3)(PO4)2

Rare-Earth Ion-Activated Nanostructured Fluorescent Marker for Easy Naked Eye Detection and Swift Imaging of Latent Fingerprints

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Synthesis, crystal structure and luminescence properties of a new samarium borate phosphate, CsNa₂Sm₂(BO₃)(PO₄)₂