A deep red phosphor Li2MgTiO4:Mn4+ exhibiting abnormal emission: Potential application as color converter for warm w-LEDs

Jin, Yahong; Hu, Yihua; Wu, Haoyi; He, Dannong; Chen, Li; Fu, Yinrong; Ju, Guifang; Mu, Zhongfei; He, Miao

doi:10.1016/j.cej.2015.12.027

Cited by 257 publications

(80 citation statements)

References 64 publications

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“…From Figure C, one knows that the surface composition of the obtained samples only exhibited the signals of Na, Sr, La, Mo, O, Er and C species. Among them, the carbon peak of C1s was about 284.6 eV which may be caused by the instrument for calibration or the absorption of CO 2 . The X‐ray photoelectron spectroscopy (XPS) result further indicated that the Er 3+ ‐doped NaSrLa(MoO 4 )O 3 phosphors were successfully synthesized.…”

Section: Resultsmentioning

confidence: 99%

NUV light induced visible emission in Er³⁺‐activated NaSrLa(MoO₄)O₃ phosphors for green LEDs and thermometer

et al. 2019

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Er3+‐activated NaSrLa(MoO4)O3 phosphors were synthesized by a traditional solid‐state reaction technique, which exhibited bright green emissions ascribing to the (2H11/2, 4S3/2) → 4I15/2 transitions of Er3+ ions under 377 nm excitation. The luminescence intensity increased with increasing the Er3+ ion concentration and achieved its maximum value when the doping concentration was 4 mol%. Moreover, the critical distance was estimated to be 25.32 Å, and the dipole‐dipole interaction played a significant role in NR energy transfer between Er3+ ions in NaSrLa(MoO4)O3 host lattices. At a forward bias current of 100 mA, the Light Emitting Diode (LED) device emitted a bright green emission with the color coordinate of (0.2547, 0.5996) that can be observed by the naked eye. Besides, based on the thermally coupled levels of 2H11/2 and 4S3/2, the temperature sensing performances of the prepared phosphors in the temperature range of 303‐483 K were studied using the fluorescence intensity ratio technique. The maximum sensor sensitivity was about 0.0150 K−1 when the temperature was 483 K, and the Er3+ ion concentration largely influenced the sensor sensitivity of studied samples. Furthermore, the prepared phosphors exhibited excellent water resistance and thermal stability behavior. These characteristics demonstrated that the Er3+ activated NaSrLa(MoO4)O3 phosphors were dual‐functional materials for solid‐state illumination and non‐contact temperature measurement.

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Section: Resultsmentioning

confidence: 99%

NUV light induced visible emission in Er³⁺‐activated NaSrLa(MoO₄)O₃ phosphors for green LEDs and thermometer

et al. 2019

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“…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

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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.

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“…The PLE spectrum is obtained by monitoring at 668 nm. There are four bands centered at 312 nm, 347 nm, 370 nm, and 470 nm, assigned to O 2‐ ‐Mn 4+ charge transfer and Mn 4+ : 4 A 2 → 4 T 1 , 4 A 2 → 2 T 2 , and 4 A 2 → 4 T 2 transitions, respectively . 4 A 2 → 4 T 1 and 4 A 2 → 4 T 2 are spin‐allowed transitions and 4 A 2 → 2 T 2 is spin‐forbidden transition according to the spin selection rules of ∆S = 0.…”

Section: Resultsmentioning

confidence: 99%

Dual‐activator luminescence of LuAG:Mn⁴⁺/Tb³⁺ phosphor for optical thermometry

et al. 2019

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Mn4+ and Tb3+ singly doped and Mn4+/Tb3+ codoped lutetium aluminum garnet (Lu3Al5O12, or simply LuAG) phosphors were synthesized and investigated for the application of optical thermometry. X‐ray powder diffraction and luminescence spectroscopy measurements were performed on all samples to analyze their crystal phases and optical properties. In particular, temperature‐dependent luminescence of the LuAG:Mn4+/Tb3+ sample was measured at the temperature range of 270–420 K. The results showed that the luminescence intensity of Mn4+ has gone through a remarkable decline while the luminescence of Tb3+ has an only insignificant change with the rise of temperature which leads to a dramatic decrease in the fluorescence intensity ratio (FIR) between the two activator Mn4+ and Tb3+. Further analysis showed that the LuAG:Mn4+/Tb3+ sample used for temperature sensing has a high relative sensitivity with maximum value of 4.3% K−1 at 333 K. Our research indicated that this LuAG:Mn4+/Tb3+ material is a promising candidate for FIR‐type optical temperature sensing.

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A deep red phosphor Li2MgTiO4:Mn4+ exhibiting abnormal emission: Potential application as color converter for warm w-LEDs

Cited by 257 publications

References 64 publications

NUV light induced visible emission in Er³⁺‐activated NaSrLa(MoO₄)O₃ phosphors for green LEDs and thermometer

NUV light induced visible emission in Er³⁺‐activated NaSrLa(MoO₄)O₃ phosphors for green LEDs and thermometer

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

Dual‐activator luminescence of LuAG:Mn⁴⁺/Tb³⁺ phosphor for optical thermometry

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A deep red phosphor Li2MgTiO4:Mn4+ exhibiting abnormal emission: Potential application as color converter for warm w-LEDs

Cited by 257 publications

References 64 publications

NUV light induced visible emission in Er3+‐activated NaSrLa(MoO4)O3 phosphors for green LEDs and thermometer

NUV light induced visible emission in Er3+‐activated NaSrLa(MoO4)O3 phosphors for green LEDs and thermometer

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

Dual‐activator luminescence of LuAG:Mn4+/Tb3+ phosphor for optical thermometry

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NUV light induced visible emission in Er³⁺‐activated NaSrLa(MoO₄)O₃ phosphors for green LEDs and thermometer

NUV light induced visible emission in Er³⁺‐activated NaSrLa(MoO₄)O₃ phosphors for green LEDs and thermometer

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

Dual‐activator luminescence of LuAG:Mn⁴⁺/Tb³⁺ phosphor for optical thermometry