Single-phase white light emission Ca9NaLu0.667(PO4)7: Eu2+, Mn2+ phosphor for the application of WLED

Zhao, Yanxia; Zhang, Dan; Song, Yanhua; Li, Z.H.; Zheng, Baofeng; Zheng, Zhibo; Zhang, Xiangting; Zou, Haifeng

doi:10.1016/j.ceramint.2023.05.130

Cited by 16 publications

(3 citation statements)

References 38 publications

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“…Through the calculation of integrated emission counts within the 500–700 nm range, we determined the quantum efficiency η of the LZO:3Er 3+ @OA, LZO:3Er 3+ @PVP, and LZO:3Er 3+ @EDTA NPs to be approximately 68.7%, 61.5%, and 66.1%, respectively. These QE values align with those reported for other green-emitting phosphors, − underscoring the strong potential of LZO:3Er 3+ @OA NPs for application in LEDs.…”

Section: Resultssupporting

confidence: 83%

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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Section: Resultssupporting

confidence: 83%

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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“…The shorter the bond length, the lower the energy position it occupies. 26 Hence, the peak at 377 nm can be related with Ce 3+ in Ba1 and Ba2 sites due to the longer Ba1−O and Ba2−O distance distribution (2.88 Å). Ce 3+ ions occupy Ba3 and Ba4 sites to cause the emission band at 393 nm with a shorter distance distribution (2.86 Å).…”

Section: Resultsmentioning

confidence: 98%

“…The value of the bond length for Ba n O 9 is given in Table S2. The shorter the bond length, the lower the energy position it occupies . Hence, the peak at 377 nm can be related with Ce 3+ in Ba1 and Ba2 sites due to the longer Ba1–O and Ba2–O distance distribution (2.88 Å).…”

Section: Resultsmentioning

confidence: 99%

Ba₃Lu(BO₃)₃:Ce³⁺,Tb³⁺/Mn²⁺: Dual-Functional Material for WLEDs and Optical Pressure Sensing

Zhao,

Zheng,

et al. 2024

Inorg. Chem.

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Ba 3 Lu(BO 3 ) 3 (BLB):Ce 3+ ,Tb 3+ /Mn 2+ phosphors were designed to explore effective and multifunctional applications. Under the excitation of near-ultraviolet (n-UV) light, the BLB:Ce 3+ phosphor showed broad-band blue emission. After codoping with Mn 2+ ions, the single-phase white light phosphor is achieved through the energy transfer (ET) between Ce 3+ and Mn 2+ . In addition, thermal stability is significantly enhanced by the addition of Tb 3+ (BLB:0.02Ce 3+ ,0.20Tb 3+ ) compared to that codoped with Mn 2+ (BLB:0.02Ce 3+ ,0.10Mn 2+ ). The light-emitting diode (LED) device with warm white light emission is fabricated with UV-chip-coated BLB:0.02Ce 3+ ,0.05Tb 3+ and Sr 2 Si 5 N 8 :Eu 2+ phosphors, showing a good potential application value for LEDs. Additionally, the spectral properties of borate-based phosphors (BLB:0.02Ce 3+ ) under high pressure were studied for the first time. Surprisingly, the change of pressure enabled the emission peak of BLB:0.02Ce 3+ to be tuned from 485 to 552 nm, and dλ/dP is 3.51 nm GPa −1 . The color changes from blue to yellow with an increase of pressure. Compared with the reported data, the pressure-sensing sensitivity based on the central peak shift in this work is the highest in all Ce 3+ single-doped samples. In addition, the emitting color and intensity were gradually regained after decompression. The intensity can reach 80% of the initial intensity. All data demonstrate that the BLB:0.02Ce 3+ phosphor has the potential to be utilized as an optical pressure sensor due to the high-pressure sensitivity and visible color tuning.

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Insight into Structure, Regulatable Photoluminescence of Stably Self and Codoped Phosphor Ba₃Y₂B₆O₁₅: Dy/Eu for nUV wLEDs

Wang,

Yue,

et al. 2024

Laser & Photonics Reviews

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The exploitation of borate‐based phosphors is garnered tremendous attention in wLEDs. Although previous research provided some insights into borates from the viewpoints of synthesis, structure, and defect evolutions, their photoluminescence (PL) with dopants is still insufficient for actual application, especially on aspects of efficiency/stability. Herein, to alleviate the above issues, a new type of lesser‐known high symmetry Ba3Y2B6O15 (BYB) codoped with Dy3+/Eu3+ phosphors are synthesized via multistep solid‐state reaction and possessed controllable PL based on nUV excitation, defect‐induced (self‐) PL, and energy transfer (ET) from Dy3+ to Eu3+. The origin of blue self‐PL is clarified based on oxygen‐related defects and optimized via adjusting synthetic atmosphere (air/Ar) and (co)doping dopants to control the defect content. Thanks to dense connectivity, and highly symmetric structure with perfectly ordered octahedral sites of Y3+ for accommodation of Dy/Eu and ET, “cool” white and red PL from Dy3+ and Eu3+, respectively, show high PL efficiency with narrow full width at half the maximum (fwhm). The phosphor also exhibits excellent thermal stability because of high bandgap and low electron‐phonon coupling. Finally, a high‐quality phosphor‐converted wLED (pc‐wLED) device is assembled via remote “capping” packaging by adopting the BYB: Dy/Eu and a 350 nm nUV LED chip.

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Single-phase white light emission Ca9NaLu0.667(PO4)7: Eu2+, Mn2+ phosphor for the application of WLED

Cited by 16 publications

References 38 publications

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

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

Ba₃Lu(BO₃)₃:Ce³⁺,Tb³⁺/Mn²⁺: Dual-Functional Material for WLEDs and Optical Pressure Sensing

Insight into Structure, Regulatable Photoluminescence of Stably Self and Codoped Phosphor Ba₃Y₂B₆O₁₅: Dy/Eu for nUV wLEDs

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Single-phase white light emission Ca9NaLu0.667(PO4)7: Eu2+, Mn2+ phosphor for the application of WLED

Cited by 16 publications

References 38 publications

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

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

Ba3Lu(BO3)3:Ce3+,Tb3+/Mn2+: Dual-Functional Material for WLEDs and Optical Pressure Sensing

Insight into Structure, Regulatable Photoluminescence of Stably Self and Codoped Phosphor Ba3Y2B6O15: Dy/Eu for nUV wLEDs

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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

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

Ba₃Lu(BO₃)₃:Ce³⁺,Tb³⁺/Mn²⁺: Dual-Functional Material for WLEDs and Optical Pressure Sensing

Insight into Structure, Regulatable Photoluminescence of Stably Self and Codoped Phosphor Ba₃Y₂B₆O₁₅: Dy/Eu for nUV wLEDs