Efficient luminescence lifetime thermometry with enhanced Mn4+-activated BaLaCa1−xMgxSbO6 red phosphors

Li, Guixian; Gan, Li; Mao, Qinan; Pei, Lang; Yu, Hua; Liu, Meijiao; Chu, Liang; Zhong, Jiasong

doi:10.1016/j.cej.2021.132923

Cited by 41 publications

(39 citation statements)

References 44 publications

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“…The decay curves of the Ca 2 LaHf 2 Al 3 O 12 : x Eu 3+ phosphors are displayed in Figure f, which can be well-fitted using the following single-exponential formula − where I is the emission intensity at time t ; I 0 refers to the initial emission intensity; A is a constant; and τ represents the decay lifetime. 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.…”

Section: Resultsmentioning

confidence: 99%

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: Resultsmentioning

confidence: 99%

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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“…Generally, the shift for PL spectra could be ascribed to three factors: crystal field splitting (CFS), 5d centroid shift, and the Stokes shift. − The CFS is the energy difference from the highest to the lowest 5d level, which can be approximated by the corresponding bond length from the doping ions to the corresponding ligands, which could be determined by the following formula , where D q represents the magnitude for the 5d level separation, z represents the anionic valence, e represents the electronic charge, r represents the radius for the d-wave function, and R represents the bond distance between Ce 3+ and O 2– ions. Naturally, D q and R 5 are inversely proportional.…”

Section: Resultsmentioning

confidence: 99%

Highly Efficient Broad-Band Green-Emitting Cerium(III)-Activated Garnet Phosphor Allows the Fabrication of Blue-Chip-Based Warm-White LED Device with a Superior Color Rendering Index

Chan

Cao

et al. 2022

Inorg. Chem.

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High-performance warm-white light-emitting diode (LED) devices are in great demand toward green and comfortable solid-state lighting. Herein, we report a creative green-emission CaY 2 HfGa(AlO 4 ) 3 :Ce 3+ phosphor. CaY 2 HfGa(AlO 4 ) 3 :Ce 3+ compounds with different cerium ion doping contents have been successfully prepared through a conventional high-temperature solid-state method, and their phase and crystal structure have been revealed via the powder X-ray diffraction and Rietveld refinement. Impressively, the CaY 2 HfGa(AlO 4 ) 3 :Ce 3+ phosphors exhibit a broad-band excitation, which well covers the wavelength region from the 300 to 500 nm, corresponding to the commercial blueemitting LED chip. Upon 450 nm excitation, the optimal CaY 2 HfGa(AlO 4 ) 3 :2%Ce 3+ sample shows an intense broad-band green emission (the corresponding testing spectral range: 460− 750 nm) with a strongest peak about 534 nm. In addition, the CaY 2 HfGa(AlO 4 ) 3 :2%Ce 3+ sample possesses a broad full width at halfmaximum equal to 120 nm; moreover, its CIE chromaticity coordinate and the internal quantum efficiency are determined to be (0.3541, 0.5427) and 72.8%, respectively. A high-quality warm-white LED has been fabricated through incorporating our CaY 2 HfGa(AlO 4 ) 3 :2%Ce 3+ green phosphors and commercial red phosphors with the 450 nm blue LED chip. When upon the 20 mA bias driving current, the LED device demonstrates a bright warm-white light emission, which possesses a satisfactory color rendering index of 91, a low correlated color temperature of 4080 K, as well as a good luminous efficacy of 85.14 lm W −1 . The creative greenemitting CaY 2 HfGa(AlO 4 ) 3 :Ce 3+ garnet phosphor has a bright application prospect toward high-quality warm-white LED lighting.

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“…As shown in Fig. 5(d), the maximum relative sensing sensitivity was found to be about 1.73% K −1 at 453 K, and it is excellent in comparison with some luminescent materials based on the TDL or LIR techniques, 40,[62][63][64][65][66][67][68][69][70][71][72][73][74] as summarized in Table 2.…”

Section: Papermentioning

confidence: 76%

“…The accuracy of optical thermometers could be estimated from the temperature uncertainty (δT ), which can be calculated using eqn (17). 74 The relative error (δτ/τ) in decay curve measurements was determined to be approximately 0.5%. Therefore, it is obvious that the temperature uncertainty (δT ) decreased with the increase of temperature; furthermore, its value was "±0.289 K" at 453 K, which is excellent compared to those in some previous reports, for instance, LiLaMgWO 6 :…”

Section: Papermentioning

confidence: 96%

Designing bifunctional platforms for LED devices and luminescence lifetime thermometers: a case of non-rare-earth Mn⁴⁺ doped tantalate phosphors

et al. 2022

Dalton Trans.

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Efficient luminescence lifetime thermometry with enhanced Mn4+-activated BaLaCa1−xMgxSbO6 red phosphors

Cited by 41 publications

References 44 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

Highly Efficient Broad-Band Green-Emitting Cerium(III)-Activated Garnet Phosphor Allows the Fabrication of Blue-Chip-Based Warm-White LED Device with a Superior Color Rendering Index

Designing bifunctional platforms for LED devices and luminescence lifetime thermometers: a case of non-rare-earth Mn⁴⁺ doped tantalate phosphors

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Efficient luminescence lifetime thermometry with enhanced Mn4+-activated BaLaCa1−xMgxSbO6 red phosphors

Cited by 41 publications

References 44 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

Highly Efficient Broad-Band Green-Emitting Cerium(III)-Activated Garnet Phosphor Allows the Fabrication of Blue-Chip-Based Warm-White LED Device with a Superior Color Rendering Index

Designing bifunctional platforms for LED devices and luminescence lifetime thermometers: a case of non-rare-earth Mn4+ doped tantalate phosphors

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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

Designing bifunctional platforms for LED devices and luminescence lifetime thermometers: a case of non-rare-earth Mn⁴⁺ doped tantalate phosphors