Understanding the downconversion photoluminescence of NaLaP4O12:Er3+ phosphor

Zhou, Yang; Ge, Xinchen; Zhang, Zhuohui; Luo, Wenjie; Xu, Hang; Li, Wufu; Zhu, Jing

doi:10.1016/j.ceramint.2019.06.268

Cited by 23 publications

(4 citation statements)

References 36 publications

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“…All the FTIR spectra with dopant Sm 3+ ions keep the same shapes and locations of vibration peaks as that of the pure KNBP phase. These absorption vibrations are caused by BO 4 and PO 4 tetrahedra [21,22], which are basic structural groups in the KNBP matrix. The vibrations at 1193 and 1148 cm -1 result from the asymmetric stretching mode of the PO 4 group.…”

Section: Xrd and Ftir Analysismentioning

confidence: 99%

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

et al. 2021

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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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Section: Xrd and Ftir Analysismentioning

confidence: 99%

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

et al. 2021

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“…The excitation spectrum shows numerous excitation peaks in the 325 to 500 nm wavelength range. Excitation peaks can be observed at particular wavelengths, including 360 ( 4 I 15/2 → 2 K 15/2 ), 367 ( 4 I 15/2 → 4 G 9/2 ), 380 ( 4 I 15/2 → 4 G 11/2 ), 408 ( 4 I 15/2 → 2 H 9/2 ), 446 ( 4 I 15/2 → 4 F 3/2 ), 456 ( 4 I 15/2 → 4 F 5/2 ) and 491 nm ( 4 I 15/2 → 4 F 7/2 ), which are associated to the 4 f–4 f transitions of Er 3+ ion [43,44] . Among all peaks, the excitation peak with the highest intensity was observed at 380 nm wavelength ascribed to the transition 4 I 15/2 → 4 G 11/2 .…”

Section: Resultsmentioning

confidence: 99%

“…4 F 7/2 ), which are associated to the 4 f-4 f transitions of Er 3 + ion. [43,44] Among all peaks, the excitation peak with the highest intensity was observed at 380 nm wavelength ascribed to the transition 4 I 15/2 ! 4 G 11/2 .…”

Section: Drs Analysismentioning

confidence: 99%

Green Emission of Erbium Doped SYW Phosphors for Optical Thermometry And Solid‐State Lighting

Kumari,

Rao,

Sinha

2024

ChemPhotoChem

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A series of Er3+ ions doped Sr9Y2W4O24 (SYW) phosphors have been synthesised using solid‐state reaction technique. For optical thermometry and solid state lighting applications, the crystal structure, morphological, and luminescence features of the SYW: Er3+ phosphors were explored. X‐ray diffraction (XRD) reveal that synthesised phosphors having single phase with a tetragonal crystal structure and I41/a space group. SEM was used to examine the morphological behaviour and presence of composition elements. The optical bandgap of the phosphor was evaluated using UV‐Vis diffuse reflection spectra (DRS). The photoluminescence (PL) emission spectra were captured under 380 nm excitation, and the peak with the maximum intensity was identified at 563 nm ascribed to transition 4S3/2 →4I15/2, that emits green color in visible region. The temperature dependent PL (TD‐PL) spectra show that SYW phosphor is substantially more thermally stable, having thermal activation energy of about 0.247 eV. Additionally, the fluorescence intensity ratio (FIR) was used to study the optical sensing characteristics of the thermal quenching transitions (2H11/2, 4S3/2) with maximum relative sensitivity (SR) and an absolute sensitivity (SA) being 1.33% K−1and 0.307% K‐1, respectively. All of the aforementioned findings demonstrate that SYW: Er3+ phosphors have potential for optical thermometry and other photonic devices.

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“…Table shows that the estimated chromaticity value ( x , y ) changes significantly as the doping concentrations increase. The color purity is calculated using the formula (eq ) described in ref . Color purity = false( x − x normali false) 2 + false( y − y normali false) 2 false( x normald − x normali false) 2 + false( y normald − y normali false) 2 × 100 % As shown in Table , the CIE chromaticity coordinates of LZO:Er 3+ (1–5 mol %) NPs, denoted as ( x , y ), are compared with the coordinates of the illuminant point ( x i , y i ) and the dominant wavelength at 550 nm ( x d , y d ). The color purity and QE performance of the LZO:3Er 3+ sample have been compared with other surface-modified materials as listed in Table S4 (Supporting Information).…”

Section: Resultsmentioning

confidence: 99%

Enhanced Down-Conversion Emission, High-Level Security, and Advanced Latent Fingerprint Visualization in La₂Zr₂O₇:Er³⁺ Nanophosphor through Surface Modification and Deep Learning Analysis

Lavanya,

Krushna,

Manjunatha

et al. 2024

ACS Appl. Opt. Mater.

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This study explores surface modifications on Er 3+ -activated La 2 Zr 2 O 7 nanophosphors (NPs) through solution combustion, revealing a narrower band gap (3.1 eV) in surface-modified NPs. Under UV excitation (378 nm), these nanophosphors emit green light at 550 nm, notably enhanced by oleic acid (OA) modification, offering the potential for white light-emitting diode applications. Due to enhanced energy transfer processes, OA-modified NPs show 98.6% color purity and improved quantum efficiency (68.7%). Additionally, OA-modified NPs exhibit promise for UV-based forensic applications. This research also showcases the YOLOv8 algorithm's robustness (mAP@50 of 0.78 for bifurcation, 0.72 for ridge-end) in fingerprint detection, aiding forensics. The deep learning method supports feature-matching fingerprint detection and advanced identification techniques. These findings offer insights into nanophosphor modification's optical impact and advanced fingerprint identification methods, contributing to lighting technology and forensic applications.

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Understanding the downconversion photoluminescence of NaLaP4O12:Er3+ phosphor

Cited by 23 publications

References 36 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

Green Emission of Erbium Doped SYW Phosphors for Optical Thermometry And Solid‐State Lighting

Enhanced Down-Conversion Emission, High-Level Security, and Advanced Latent Fingerprint Visualization in La₂Zr₂O₇:Er³⁺ Nanophosphor through Surface Modification and Deep Learning Analysis

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Understanding the downconversion photoluminescence of NaLaP4O12:Er3+ phosphor

Cited by 23 publications

References 36 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

Green Emission of Erbium Doped SYW Phosphors for Optical Thermometry And Solid‐State Lighting

Enhanced Down-Conversion Emission, High-Level Security, and Advanced Latent Fingerprint Visualization in La2Zr2O7:Er3+ Nanophosphor through Surface Modification and Deep Learning Analysis

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Enhanced Down-Conversion Emission, High-Level Security, and Advanced Latent Fingerprint Visualization in La₂Zr₂O₇:Er³⁺ Nanophosphor through Surface Modification and Deep Learning Analysis