Photoluminescence and photometric studies of low temperature prepared red emitting MgAl2O4:Cr3+ nanophosphors for solid state displays

Pratapkumar, C.; Prashantha, S.C.; Nagabhushana, H.; Jnaneshwara, D.M.

doi:10.1016/j.jsamd.2018.09.002

Cited by 10 publications

(12 citation statements)

References 40 publications

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“…The Dq value (1600 cm −1 ) is compatible with Cr 3+ introduced into an octahedral environment, and the Dq/B ratio obtained from the Tanabe-Sugano diagram and the Adachi model [46,47] indicates that the Cr 3+ cations are subjected to an intermediate crystal field [36,52]. The Racah B value is lower than the free-ion value (918 cm −1 [43]), which indicates the covalent character of the Cr 3+ -O 2− bond.…”

Section: Emission and Excitation Spectramentioning

confidence: 80%

Broadband photoluminescence in a ceramic (Mg2SnO4–SnO2):Cr3+ system

et al. 2021

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This study reports the synthesis and photoluminescence spectroscopic studies of Cr3+-doped Mg2SnO4–SnO2 ceramics. The crystal structure was analyzed by X-ray powder diffraction, and photoluminescence was investigated at room temperature. The diffractogram confirmed the presence of Mg2SnO4 and SnO2 phases. Photoluminescence spectroscopy identified broad and intense emission bands assigned to the Cr3+ cation occupation in octahedral Mg2SnO4 sites and an orange band assigned to SnO2 emission. All spectra were analyzed and interpreted according to crystal field theory and Tanabe–Sugano theory for the d3 electronic configuration. The broad and intense emission band covering the visible/near-infrared region suggests that this system may be a promising material for use as an active medium in a broadband light source at room temperature.

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Section: Emission and Excitation Spectramentioning

confidence: 80%

Broadband photoluminescence in a ceramic (Mg2SnO4–SnO2):Cr3+ system

et al. 2021

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“…CCT is one of the important parameters to evaluate phosphor performance. It is reported that CCT values below 5000 K are ideal to generate artificial warm white light . The CCT values of our LHOS NPs are calculated using McCamy and Kelly approximation mentioned in eq S5. , …”

Section: Resultsmentioning

confidence: 99%

“…It is reported that CCT values below 5000 K are ideal to generate artificial warm white light. 56 The CCT values of our LHOS NPs are calculated using McCamy and Kelly approximation mentioned in eq S5. 57,58 The calculated CCT values of the LHOS NPs are in the range of 3057−3437 K (Table S4), and the variation of the CCT values is shown in Figure 3b.…”

Section: Structural Analysismentioning

confidence: 99%

Samarium-Activated La₂Hf₂O₇ Nanoparticles as Multifunctional Phosphors

et al. 2019

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Recent developments in the field of designing novel nanostructures with various functionalities have pushed the scientific world to design and develop high-quality nanomaterials with multifunctional applications. Here, we propose a new kind of doped metal oxide pyrochlore nanostructure for solid-state phosphor, X-ray scintillator, and optical thermometry. The developed samarium-activated La2Hf2O7 (LHOS) nanoparticles (NPs) emit a narrow and stable red emission with lower color temperature and adequate critical distance under near-UV and X-ray excitations. When the LHOS NPs are exposed to an energetic X-ray beam, the Sm3+ ions situated at the symmetric environment get excited along with those located at the asymmetric environment, which results in a low asymmetry ratio of Sm3+ under radioluminescence compared to photoluminescence. High activation energy and adequate thermal sensitivity of the LHOS NPs highlight their potential as a thermal sensor. Our results indicate that these Sm3+-activated La2Hf2O7 NPs can serve as a multifunctional UV, X-ray, and thermographic phosphor.

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“…53,54 The R-line is due to a Cr 3+ transition when the cation has an octahedral coordination geometry in a strong crystal field, whereas the N-line is due to the perturbation of Cr 3+ owing to the inversion of Mg 2+ and Al 3+ in the first two coordination spheres. 4,10,[53][54][55] The PLE spectra (Fig. 5, right-hand side) reveal two broad bands between 15500.0 and 30000.0 cm À1 .…”

Section: Materials Advances Papermentioning

confidence: 99%

“…3,6,8 Cr 3+ is widely used as a dopant for the development of tunable lasers, displays, and bioimaging. 10 Cr 3+ has a 3d 3 electronic configuration and exhibits photoluminescence (PL) emission from either the 2 E or the 4 T 2 excited state. The emission depends on the strength of the crystal field environment surrounding the Cr 3+ ion, 11 which can be divided into two categories: the low-field host matrix resulting in a spin-allowed transition of 4 T 2 -4 A 2 (green emission) or the high-field host matrix resulting in the R-lines spin-forbidden transition of 2 E -4 A 2 (red/pink emission).…”

Section: Introductionmentioning

confidence: 99%