Luminescence study of Eu3+-doped garnet phosphors: Relating structure to emission

Pasiński, Damian; Sokolnicki, J.

doi:10.1016/j.jallcom.2016.10.243

Cited by 23 publications

(3 citation statements)

References 26 publications

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“…Then, the values of decay lifetimes of the Ca 2 LaHf 2 Al 3 O 12 : x Eu 3+ samples were calculated to be 2.159, 2.133, 2.071, 2.128, 1.989, 1.874, 1.754, 1.545, and 1.386 ms for x = 10, 15, 20, 30, 40, 50, 60, 70, and 80%, respectively. These values are very similar to some red-emitting garnet-type Eu 3+ activated phosphors, such as Li 7 La 3 Hf 2 O 12 :Eu 3+ (1.43 ms), Li 3 Gd 3 Te 2 O 12 :Eu 3+ (1.066 ms), and Ca 3 Y 2 Ge 3 O 12 :Eu 3+ (1.4 ms). − …”

Section: Resultssupporting

confidence: 78%

Dazzling Red-Emitting Europium(III) Ion-Doped Ca₂LaHf₂Al₃O₁₂ Garnet-Type Phosphor Materials with Potential Application in Solid-State White Lighting

Devakumar

et al. 2022

Inorg. Chem.

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Bright red-emitting phosphors with high color purity and high photoluminescence quantum yield (PLQY) are highly demanded for the fabrication of high-performance warmwhite light-emitting diodes (LEDs). Herein, we demonstrated a novel efficient Eu 3+ -activated Ca 2 LaHf 2 Al 3 O 12 garnet phosphor with excellent luminescence properties for near-ultraviolet (near-UV) excited warm-white LEDs. The Ca 2 LaHf 2 Al 3 O 12 :Eu 3+ phosphors exhibited an intense excitation spectrum in the near-UV region with a maximum around 394 nm, and they produced dazzling red luminescence peaking at 592, 614, 659, and 711 nm due to the 5 D 0 → 7 F J (J = 1−4) transitions of Eu 3+ ions when the excitation wavelength was set at 394 nm. Luminescent properties have been studied as a function of Eu 3+ doping concentration, and the highest emission intensity was achieved at 50 mol % Eu 3+ , while the dipole−dipole interaction brought the concentration quenching effect. The Ca 2 LaHf 2 Al 3 O 12 :50%Eu 3+ sample exhibited CIE chromaticity coordinates of (0.6419, 0.3575) with a color purity of 92.7%, and its PLQY was measured to be 64%. The thermal stability and activation energy of Ca 2 LaHf 2 Al 3 O 12 :50%Eu 3+ phosphors were also discussed and analyzed. Finally, we made a near-UV chip-based white LED device in which the Ca 2 LaHf 2 Al 3 O 12 :50%Eu 3+ phosphor was utilized as a red ingredient. A bright warm-white light emission was realized from this LED device under 80 mA driving current, accompanied by a high color rendering index (CRI) of 88.3, a low correlation color temperature of 3853 K, and good CIE chromaticity coordinates of (0.3909, 0.3934). These results revealed that these red-emitting Ca 2 LaHf 2 Al 3 O 12 :Eu 3+ phosphors have promising application prospect in near-UV-excited warm-white LEDs with high a CRI.

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Section: Resultssupporting

confidence: 78%

Dazzling Red-Emitting Europium(III) Ion-Doped Ca₂LaHf₂Al₃O₁₂ Garnet-Type Phosphor Materials with Potential Application in Solid-State White Lighting

Devakumar

et al. 2022

Inorg. Chem.

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“…Meanwhile, Novak & Gibbs (1971) also gave explanations based on the anomalous features in the structural stability of the hypothetical silicate garnets structures. Nevertheless, Sr-garnets are discovered in germanium garnets, such as (Sr) 3 {Y} 2 [Ge] 3 <O> 12 (Marin et al, 1991;Pasiń ski & Sokolnicki, 2017) (Novak & Gibbs, 1971;Li et al, 2010), but (Ca) 3 {Y} 2 [Si] Survey of the tolerance factor () of garnet-type compounds. The crossed red circles denote nongarnet phases.…”

Section: Crystal Chemistry Of Garnet Compounds From the Point Of Viewmentioning

confidence: 99%

Tolerance factor and phase stability of the garnet structure

Song

Zhou

Liu

2019

Acta Crystallogr C Struct Chem

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We introduce a structural descriptor, the tolerance factor, for the prediction and systematic description of the phase stability with the garnet structure. Like the tolerance factor widely adopted for the perovskite structure, it is a compositional parameter derived from the geometrical relationship between multi‐type polyhedra in the garnet structure, and the calculation only needs the information of the ionic radius. A survey of the tolerance factor over 130 garnet‐type compounds reveals that the data points are scattered in a narrow range. The tolerance factor is helpful in understanding the crystal chemistry of some garnet‐type compounds and could serve as a guide for predicting the stability of the garnet phase. The correlation between the tolerance factor and the garnet‐phase stability could be utilized by machine learning or high‐throughput screening methods in material design and discovery.

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“…[54][55][56][57] All the polyhedrons are connected orderly to form a stable rigid structure. For previously reported Eu 3+ activated deep-red emitting garnet materials, including Ca 3 Sc 2 Si 3 O 12 :Eu 3+ , [58] (Ca,Sr) 3 (Y,Sc) 2 Ge 3 O 12 :Eu 3+ , [59] Gd 3 Ga 3 Al 2 O 12 :Eu 3+ , [60] and Ca 3 Ga 2 Ge 3 O 12 :Eu 3+ , [61] they show intense deep-red emission due to the 5 D 0 → 7 F 4 transition of Eu 3+ , but their photoluminescence properties including internal quantum efficiency (IQE) and thermal stability were not investigated in detail. Although Y 2 Mg 2 Al 2 Si 2 O 12 :Eu 3+ (IQE = 60.5%, 88.5%@150 °C) and Y 3 Al 5 O 12 :Eu 3+ (IQE = 23.7%, 88.9%@150 °C) garnet phosphors present excellent luminescence thermal stability, [62,63] their IQE values still cannot exceed 65%.…”

Section: Introductionmentioning

confidence: 99%

Deep‐Red Ca₃Al₂Ge₃O₁₂:Eu³⁺ Garnet Phosphor with Near‐Unity Internal Quantum Efficiency and High Thermal Stability for Plant Growth Application

Miao

Shi

Zhang

et al. 2023

Adv Materials Technologies

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Trivalent europium (Eu3+) doped phosphors usually radiate orange or red light owing to distinct transitions from the 5D0 excited level to the ground states of 7F1 and 7F2. However, Eu3+ activated phosphors with a dominant deep‐red emission due to 5D0→7F4 transition are relatively rare. In this work, the synthesis and photoluminescence properties of Ca3Al2Ge3O12:Eu3+ deep‐red phosphor with an intense 5D0→7F4 transition are reported. Irradiating this new garnet phosphor with 394 nm near‐ultraviolet light generates a dominant deep‐red emission band centered at 707 nm. The phosphor has a high internal quantum efficiency of 98.4% and excellent luminescence thermal stability, maintaining 78.8% of the room temperature emission intensity at 150 °C. Based on the unique spectral feature of this new compound, a phosphor‐converted deep‐red LED prototype device is fabricated, producing an output power of 27.3 mW with a photoelectric conversion efficiency of 4.0% at 200 mA. Plant growth experiments are also conducted to demonstrate the obvious positive effects of the fabricated deep‐red LED on plant growth, further indicating that the as‐prepared Ca3Al2Ge3O12:Eu3+ deep‐red phosphor can act as a promising luminescence converter for plant growth LED bulbs.

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Luminescence study of Eu3+-doped garnet phosphors: Relating structure to emission

Cited by 23 publications

References 26 publications

Dazzling Red-Emitting Europium(III) Ion-Doped Ca₂LaHf₂Al₃O₁₂ Garnet-Type Phosphor Materials with Potential Application in Solid-State White Lighting

Dazzling Red-Emitting Europium(III) Ion-Doped Ca₂LaHf₂Al₃O₁₂ Garnet-Type Phosphor Materials with Potential Application in Solid-State White Lighting

Tolerance factor and phase stability of the garnet structure

Deep‐Red Ca₃Al₂Ge₃O₁₂:Eu³⁺ Garnet Phosphor with Near‐Unity Internal Quantum Efficiency and High Thermal Stability for Plant Growth Application

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Luminescence study of Eu3+-doped garnet phosphors: Relating structure to emission

Cited by 23 publications

References 26 publications

Dazzling Red-Emitting Europium(III) Ion-Doped Ca2LaHf2Al3O12 Garnet-Type Phosphor Materials with Potential Application in Solid-State White Lighting

Dazzling Red-Emitting Europium(III) Ion-Doped Ca2LaHf2Al3O12 Garnet-Type Phosphor Materials with Potential Application in Solid-State White Lighting

Tolerance factor and phase stability of the garnet structure

Deep‐Red Ca3Al2Ge3O12:Eu3+ Garnet Phosphor with Near‐Unity Internal Quantum Efficiency and High Thermal Stability for Plant Growth Application

Contact Info

Product

Resources

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Dazzling Red-Emitting Europium(III) Ion-Doped Ca₂LaHf₂Al₃O₁₂ Garnet-Type Phosphor Materials with Potential Application in Solid-State White Lighting

Dazzling Red-Emitting Europium(III) Ion-Doped Ca₂LaHf₂Al₃O₁₂ Garnet-Type Phosphor Materials with Potential Application in Solid-State White Lighting

Deep‐Red Ca₃Al₂Ge₃O₁₂:Eu³⁺ Garnet Phosphor with Near‐Unity Internal Quantum Efficiency and High Thermal Stability for Plant Growth Application