Dual-emitting Ce3+, Tb3+ co-doped LaOBr phosphor: Luminescence, energy transfer and ratiometric temperature sensing

Zhang, Xinguo; Huang, Yumei; Gong, Ming

doi:10.1016/j.cej.2016.08.087

Cited by 272 publications

(90 citation statements)

References 32 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…White light‐emitting diodes (LEDs) have attracted considerable attention as promising next‐generation solid‐state lighting devices because of their superior properties, including their small size, high efficiency, energy savings, long lifetime, and environmental properties . Currently, the majority of commercially available white LEDs are based on the use of 2 different types of devices that employ different electroluminescent materials.…”

Section: Introductionmentioning

confidence: 99%

A novel dazzling Eu³⁺‐doped whitlockite‐type phosphate red‐emitting phosphor for white light‐emitting diodes

Tang

Zheng

et al. 2018

J Am Ceram Soc

View full text Add to dashboard Cite

A series of novel red‐emitting Ca8ZnLa1−xEux(PO4)7 phosphors were successfully synthesized using the high‐temperature solid‐state reaction method. The crystal structure, photoluminescence spectra, thermal stability, and quantum efficiency of the phosphors were investigated as a function of Eu3+ concentration. Detailed analysis of their structural properties revealed that all the phosphors could be assigned as whitlockite‐type β‐Ca3(PO4)2 structures. Both the PL emission spectra and decay curves suggest that emission intensity is largely dependent on Eu3+ concentration, with no quenching as the Eu3+ concentration approaches 100%. A dominant red emission band centered at 611 nm indicates that Eu3+ occupies a low symmetry sites within the Ca8ZnLa(PO4)7 host lattice, which was confirm by Judd‐Ofelt theory. Ca8ZnLa1−xEux(PO4)7 phosphors exhibited good color coordinates (0.6516, 0.3480), high color purity (~96.3%), and high quantum efficiency (~78%). Temperature‐dependent emission spectra showed that the phosphors possessed good thermal stability. A white light‐emitting diode (LED) device were fabricated by integrating a mixture of obtained phosphors, commercial green‐emitting and blue‐emitting phosphors into a near‐ultraviolet LED chip. The fabricated white LED device emits glaring white light with high color rendering index (83.9) and proper correlated color temperature (5570 K). These results demonstrate that the Ca8ZnLa1−xEux(PO4)7 phosphors are a promising candidate for solid‐state lighting.

show abstract

Section: Introductionmentioning

confidence: 99%

A novel dazzling Eu³⁺‐doped whitlockite‐type phosphate red‐emitting phosphor for white light‐emitting diodes

Tang

Zheng

et al. 2018

J Am Ceram Soc

View full text Add to dashboard Cite

show abstract

“…T is temperature. Figure C shows that the absolute sensitivity and the relative sensitivity reaches it maximum of 0.29% K −1 and 0.46% K −1 , respectively, at 573 K. Compared with previous reported Ce 3+ , Tb 3+ codoped LaOBr phosphor thermometer, present Li 2 SrSiO 4 : 0.4% Tb 3+ has higher sensitivity (0.46% K −1 ) and wider sensing range (303‐573 K). It is noteworthy that the Li 2 SrSiO 4 :0.4%Tb 3+ phosphor has a good repeatability, when circulated with increasing and decreasing temperatures.…”

Section: Resultsmentioning

confidence: 69%

Tunable emission color of Li₂SrSiO₄:Tb³⁺ due to cross‐relaxation process and optical thermometry investigation

et al. 2018

View full text Add to dashboard Cite

A series of Li2SrSiO4:xTb3+ (0.2%, 0.4%, 0.6%, 0.8%, 2%, 4%, and 6%) phosphors were prepared by conventional solid‐state reaction. It was found that this silicate phosphor has a wide excitation band at near‐ultraviolet region (230‐300 nm) due to spin‐allowed 4f 8→4f75d1 transitions of Tb3+ ions, with the exact position dependent on the crystal field of the lattice. The cross‐relaxation process originating from 5D3→5D4 and 7F6→7F0 happened between different Tb3+ ions. It leads to the luminescence color of Li2SrSiO4: xTb3+ tuning from blue to green just by controlling Tb3+ concentrations. Furthermore, concentration quenching mechanism, energy migration type, cross‐relaxation rate and efficiency, are discussed in detail. Finally, optical thermometry properties were investigated via temperature‐dependent emission spectra. The results show that low‐concentration‐doped sample (Li2SrSiO4:0.4%Tb3+) shows remarkable optical thermometry based on fluorescence intensity ratio (FIR) between the blue and green emission of Tb3+ ions, whereas the high‐concentration‐doped sample (Li2SrSiO4:4%Tb3+) demonstrates small emission intensity loss. It illustrates that terbium‐doped silicate phosphor is a multifunctional material with potential application for display field and optical thermometry.

show abstract

“…When the temperature reaches 473 K, the Sr reaches a maximum of 2.82%K −1 . Compared with the previously reported thermometers, such as ZJU‐88 ⊃ perylene (sensitivity: 1.28%K −1 ; sensing range: 293‐353 K) and LaOBr: Ce 3+ , Tb 3+ (sensitivity: 0.42%K −1 ; sensing range: 293‐443 K) . CNL:0.02Eu 2+ /Eu 3+ has a higher sensitivity (2.82%K −1 ) and a satisfactory sensing range (298–473 K).…”

Section: Resultsmentioning

confidence: 76%

Ca₂Na₂La₆(SiO₄)₄(PO₄)₂O: Eu²⁺/Eu³⁺: A visual dual‐emitting fluorescent ratiometric temperature sensor

et al. 2019

View full text Add to dashboard Cite

A novel apatite‐based UV‐excited dual‐emitting Ca2Na2La6(SiO4)4(PO4)2O: Eu2+/Eu3+ phosphor (CNL: Eu2+/Eu3+) was designed and successfully synthesized by a solid‐state reaction. Compared with previous reports on this family of materials, a structural study based on DFT calculation exhibited a new consequence that the monovalent ions in this system are more inclined to occupy the seven‐coordinate cationic sites rather than the nine‐coordinate sites. This result was confirmed by the structural refinement and high‐resolution transmission electron microscopy (HRTEM) data. Due to the coexistence of Eu2+ and Eu3+ dopants in the material, under 345 or 392 nm excitation, CNL: 0.02Eu2+/Eu3+ exhibited a green Eu2+ emission band (528 nm) and red Eu3+ emission peaks (around 618 nm). The application potential of CNL:0.02Eu2+/Eu3+ in luminescent thermometry was studied by exploiting the temperature sensitivity of the fluorescent intensity ratio (green/red) at different temperatures. It was found that, under 345 nm excitation, the fluorescent intensity ratio of CNL: 0.02Eu2+/Eu3+ displayed linear correlation over the temperature range of 298 to 473 K with a high sensitivity of 2.82%K−1. Additionally, the emission color of the CNL: 0.02Eu2+/Eu3+ sample under UV lamp (254 and 365 nm) excitation showed an obvious change (from green to red) as the temperature increased from 298 to 473 K (from green to red). These results indicated that CNL: Eu2+/Eu3+ can serve as an excellent visual luminescent ratiometric thermometer. Furthermore, this work provides a novel reference for developing high‐performance luminescence temperature‐sensing materials.

show abstract

Dual-emitting Ce3+, Tb3+ co-doped LaOBr phosphor: Luminescence, energy transfer and ratiometric temperature sensing

Cited by 272 publications

References 32 publications

A novel dazzling Eu³⁺‐doped whitlockite‐type phosphate red‐emitting phosphor for white light‐emitting diodes

A novel dazzling Eu³⁺‐doped whitlockite‐type phosphate red‐emitting phosphor for white light‐emitting diodes

Tunable emission color of Li₂SrSiO₄:Tb³⁺ due to cross‐relaxation process and optical thermometry investigation

Ca₂Na₂La₆(SiO₄)₄(PO₄)₂O: Eu²⁺/Eu³⁺: A visual dual‐emitting fluorescent ratiometric temperature sensor

Contact Info

Product

Resources

About

Dual-emitting Ce3+, Tb3+ co-doped LaOBr phosphor: Luminescence, energy transfer and ratiometric temperature sensing

Cited by 272 publications

References 32 publications

A novel dazzling Eu3+‐doped whitlockite‐type phosphate red‐emitting phosphor for white light‐emitting diodes

A novel dazzling Eu3+‐doped whitlockite‐type phosphate red‐emitting phosphor for white light‐emitting diodes

Tunable emission color of Li2SrSiO4:Tb3+ due to cross‐relaxation process and optical thermometry investigation

Ca2Na2La6(SiO4)4(PO4)2O: Eu2+/Eu3+: A visual dual‐emitting fluorescent ratiometric temperature sensor

Contact Info

Product

Resources

About

A novel dazzling Eu³⁺‐doped whitlockite‐type phosphate red‐emitting phosphor for white light‐emitting diodes

A novel dazzling Eu³⁺‐doped whitlockite‐type phosphate red‐emitting phosphor for white light‐emitting diodes

Tunable emission color of Li₂SrSiO₄:Tb³⁺ due to cross‐relaxation process and optical thermometry investigation

Ca₂Na₂La₆(SiO₄)₄(PO₄)₂O: Eu²⁺/Eu³⁺: A visual dual‐emitting fluorescent ratiometric temperature sensor