Synthesis and luminescence properties of novel red phosphors LiRGe2O6:Mn4+ (R = Al or Ga)

Cao, Renping; Luo, Wenjie; Xiong, Qingqiang; Liang, Aihui; Jiang, Shenhua; Xu, Yujie

doi:10.1016/j.jallcom.2015.07.080

Cited by 39 publications

(8 citation statements)

References 39 publications

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“…In recent years, many researchers investigated the Mn 4+ activated oxide-based phosphors due to their chemical stability and eco-friendly synthesis process. [33][34][35][36][37][38][39][40][41][42][43][44][45][46] In this work, we reported on novel deep red emitting Mn 4+activated SrLaAlO 4 phosphors prepared by using conventional high-temperature solid-state reaction method. The crystal structure, morphology, and luminescence properties of SrLaAlO 4 :-Mn 4+ phosphors were investigated in detail.…”

Section: Introductionmentioning

confidence: 99%

Novel SrLaAlO₄:Mn⁴⁺deep-red emitting phosphors with excellent responsiveness to phytochrome P_FRfor plant cultivation LEDs: synthesis, photoluminescence properties, and thermal stability

et al. 2018

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Herein, novel rare-earth-free Mn 4+ -doped SrLaAlO 4 deep-red emitting phosphors were successfully synthesized via a traditional solid-state reaction method. The crystal structure and phase purity of the asprepared samples were confirmed by XRD Rietveld refinement. Photoluminescence properties of SrLaAlO 4 :Mn 4+ phosphors were examined in detail using photoluminescence spectra, decay lifetimes, temperature-dependent emission spectra and internal quantum efficiency measurements. The excitation spectrum obtained by monitoring at 730 nm contained two excitation bands centered at 364 and 520 nm within the range of 200-550 nm due to the Mn 4+ -O 2À charge-transfer band and the 4 A 2g / 4 T 1g , 4 T 2g transitions of the Mn 4+ ions. Under the 364 nm excitation, the SrLaAlO 4 :Mn 4+ phosphors exhibited an intense deep-red emission band in 610-790 nm wavelength range peaking at 730 nm,which was assigned to the 2 E g / 4 A 2g transition of Mn 4+ ions. The deep red emission showed excellent responsiveness to phytochrome P FR , revealing that the SrLaAlO 4 :0.4% Mn 4+ phosphors possessed a possible application in deep-red light-emitting diodes (LEDs) for plant cultivation. The optimal doping concentration of Mn 4+ ions was found to be 0.4 mol%. The critical distance R c for energy transfer among Mn 4+ ions was determined to be 5.86Å and the concentration quenching mechanism was confirmed to be the electric dipole-dipole interaction. In addition, the Commission International de I'Eclairage (CIE) colour coordinates of the SrLaAlO 4 :0.4% Mn 4+ phosphors (0.734, 0.266) were located in the deep red region and the corresponding internal quantum efficiency was measured to be about 29%.The above results confirmed that the as-prepared SrLaAlO 4 :0.4% Mn 4+ deep red emitting phosphors might be a potential candidate for plant cultivation LEDs.

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Section: Introductionmentioning

confidence: 99%

Novel SrLaAlO₄:Mn⁴⁺deep-red emitting phosphors with excellent responsiveness to phytochrome P_FRfor plant cultivation LEDs: synthesis, photoluminescence properties, and thermal stability

et al. 2018

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“…The peak at 311 nm is attributed to the O 2– → Mn 4+ transition (charge transfer band), whereas the peaks at 348, 395, and 468 nm correspond to 4 A 2 → 4 T 1 , 4 A 2 → 2 T 2 , and 4 A 2 → 4 T 2 transitions of Mn 4+ ions in the host lattice, respectively . The PL spectra excited by the three different wavelengths of 348, 395, and 468 nm in Figure b show similar shapes, revealing that the luminescence comes from the transitions of Mn 4+ ions . The three peaks at 643, 656, and 666 nm observed in all PL spectra are ascribed to 4 T 1 → 4 A 2 , 4 T 2 → 4 A 2 , and 2 E → 4 A 2 transitions of Mn 4+ ions .…”

Section: Resultsmentioning

confidence: 88%

Excellent Quantum Efficiency and Superior Color Purity Red-Emitting CaAl₁₂O₁₉–CaAl₄O₇–MgAl₂O₄:Mn⁴⁺ Phosphors for Plant Growth and High Color Rendering Index White Light-Emitting Diode Applications

Huyen

Nguyen

Quang

et al. 2022

ACS Appl. Electron. Mater.

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This work reports an excellent quantum efficiency and superior color purity CaAl12O19–CaAl4O7–MgAl2O4:Mn4+ (CCM:Mn4+) red-emitting phosphor. This phosphor can be excited by a broad excitation band ranging from 300 to 500 nm, and it generates an intense broadband red emission peaking at 656 nm. The CCM:0.5%Mn4+ phosphor-possessed superior color purity of 100%, a long lifetime of 0.49 ms, and high activation energy of 0.286 eV. Four different prototypes of plant growth light-emitting diodes (LEDs) with high quantum efficiencies of 81.8, 72.1, 67.2, and 61.1% were fabricated by coating the optimized CCM:0.5%Mn4+ phosphors onto UV (365 nm), NUV (395 nm), violet (410), and blue (460 nm) LED chips, respectively. The 81.8% and 72.1% QE values are the highest values reported for the 365 nm UV-pumped and 395 nm NUV-pumped LEDs based on Mn4+-doped oxide phosphors. Furthermore, a white LED with a high color rendering index (CRI) of 90, correlated color temperature (CCT) of 2416 K, and luminous efficacy of radiation (LER) of 216 lm/W was realized using a blue LED chip and a mixture of CCM:0.5%Mn4+ and commercial YAG:Ce3+ phosphors. Our results demonstrate great potential for using CCM:Mn4+ phosphors for plant growth LEDs and white light-emitting diode (WLED) applications.

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“…The determined fluorescence lifetime of the sample is about 1.656 ms according to the following formula:

\begin{equation}I = A{\rm{exp}}( - t/\tau ) + B\end{equation}

where τ is fluorescence lifetime (ms), t is decay time (ms), I is fluorescence intensity, A and B are constants. Most lifetimes for Mn 4+ ‐activated phosphors are reported at the value range of 1.259–4.13 ms, and the calculated lifetime of the ceramic film falls in the range 49–52 …”

Section: Resultsmentioning

confidence: 99%

Pressureless sintering of LRH nanoplates on amorphous alumina for near‐infrared GAP:Mn⁴⁺ transparent ceramic film

et al. 2022

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Transparent ceramics have become a research hotspot in the preparation of fluorescent materials in recent years, because of their excellent physical and chemical properties and high transparency. Gadolinium aluminate, as a stable matrix material, is often doped with various active ions to obtain luminescence with different colors. However, it is very difficult to fabricate gadolinium aluminate transparent ceramics by a traditional method, although they are the charming solid lighting materials. Here, we developed a pressureless sintering method to prepare GdAlO 3 :Mn (GAP:Mn) transparent ceramic films, which were prepared by spin coating layered rare-earth hydroxide (LRH) on amorphous alumina substrate and sintering at 1550 • C for 2 h. Through the interface reaction, the Al 2 O 3 reacted with Gd 2 O 3 to form mesophase Gd 4 Al 2 O 9 below 1550 • C. However, the final products are GdAlO 3 at 1550 • C. The GAP:Mn 4+ film exhibits a high transmittance of about 90%. Under UV excitation at 310 nm, the ceramic film outputs deep red and NIR emissions, which are both arising from the 2 E g -4 A 2g transition of Mn 4+ . Due to the electron traps arising from unequal valence substitution, the ceramic film exhibits a negative thermal quenching phenomenon. The ceramic film has a good luminescence thermal stability, because its emission intensity at 150 • C maintains over 72% that at room temperature. This work may pave a new way to fabricate transparent ceramics using LRHs.

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Synthesis and luminescence properties of novel red phosphors LiRGe2O6:Mn4+ (R = Al or Ga)

Cited by 39 publications

References 39 publications

Novel SrLaAlO₄:Mn⁴⁺deep-red emitting phosphors with excellent responsiveness to phytochrome P_FRfor plant cultivation LEDs: synthesis, photoluminescence properties, and thermal stability

Novel SrLaAlO₄:Mn⁴⁺deep-red emitting phosphors with excellent responsiveness to phytochrome P_FRfor plant cultivation LEDs: synthesis, photoluminescence properties, and thermal stability

Excellent Quantum Efficiency and Superior Color Purity Red-Emitting CaAl₁₂O₁₉–CaAl₄O₇–MgAl₂O₄:Mn⁴⁺ Phosphors for Plant Growth and High Color Rendering Index White Light-Emitting Diode Applications

Pressureless sintering of LRH nanoplates on amorphous alumina for near‐infrared GAP:Mn⁴⁺ transparent ceramic film

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Synthesis and luminescence properties of novel red phosphors LiRGe2O6:Mn4+ (R = Al or Ga)

Cited by 39 publications

References 39 publications

Novel SrLaAlO4:Mn4+deep-red emitting phosphors with excellent responsiveness to phytochrome PFRfor plant cultivation LEDs: synthesis, photoluminescence properties, and thermal stability

Novel SrLaAlO4:Mn4+deep-red emitting phosphors with excellent responsiveness to phytochrome PFRfor plant cultivation LEDs: synthesis, photoluminescence properties, and thermal stability

Excellent Quantum Efficiency and Superior Color Purity Red-Emitting CaAl12O19–CaAl4O7–MgAl2O4:Mn4+ Phosphors for Plant Growth and High Color Rendering Index White Light-Emitting Diode Applications

Pressureless sintering of LRH nanoplates on amorphous alumina for near‐infrared GAP:Mn4+ transparent ceramic film

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Novel SrLaAlO₄:Mn⁴⁺deep-red emitting phosphors with excellent responsiveness to phytochrome P_FRfor plant cultivation LEDs: synthesis, photoluminescence properties, and thermal stability

Novel SrLaAlO₄:Mn⁴⁺deep-red emitting phosphors with excellent responsiveness to phytochrome P_FRfor plant cultivation LEDs: synthesis, photoluminescence properties, and thermal stability

Excellent Quantum Efficiency and Superior Color Purity Red-Emitting CaAl₁₂O₁₉–CaAl₄O₇–MgAl₂O₄:Mn⁴⁺ Phosphors for Plant Growth and High Color Rendering Index White Light-Emitting Diode Applications

Pressureless sintering of LRH nanoplates on amorphous alumina for near‐infrared GAP:Mn⁴⁺ transparent ceramic film