Spectral characterization and energy levels of Cr3+:Sc2(MoO4)3 crystal

Wang, Guojian; Lin, Zhoubin; Zhang, Lizhen; Huang, Yonghui; Wang, Guofu

doi:10.1016/j.jlumin.2009.07.012

Cited by 18 publications

(11 citation statements)

References 17 publications

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“…The spectra of Li 3 Al 1– x Cr III x (MoO 4 ) 3 show three broad absorptions centred at around 1.75, 2.43 and 3.50 eV, leaving two valleys in the yellow and blue regions of the visible region, which leads to the brown colour of the Cr III samples. The spectra and colour are similar to those reported for Cr 3+ :Li 2 Mg 2 (MoO 4 ) 3 , Cr 3+ :K 0.6 (Mg 0.3 Sc 0.7 ) 2 (MoO 4 ) 3 and Cr 3+ :Sc 2 (MoO 4 ) 3 compounds . Three spin‐allowed crystal‐field transitions are expected in the optical spectra of Cr III :3d 3 corresponding to 4 A 2 → 4 T 2 (F), 4 A 2 → 4 T 1 (F) and 4 A 2 → 4 T 1 (P) octahedral ligand‐field transitions.…”

Section: Resultssupporting

confidence: 81%

“…We present the colour and UV/Vis spectra, its assignment and the corresponding crystal field parameters of Li 3 Al 0.99 Cr 0.01 (MoO 4 ) 3 in Figure , based on the assignment and formulae given by Pan et al We found a 10Dq value of 14200 cm –1 for this compound. The two small shoulders on either side of the 4 A 2 → 4 T 2 (F) band arising from the spin‐forbidden transitions 4 A 2 → 2 E and 4 A 2 → 2 T 1 can also be seen (Figure ) …”

Section: Resultsmentioning

confidence: 94%

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Unique Colours of 3d‐Transition‐Metal‐Substituted Lyonsite Molybdates and Their Derivatives: The Role of Multiple Coordination Geometries and Metal‐to‐Metal Charge Transfer

Laha¹,

Natarajan²,

Gopalakrishnan³

2016

Eur J Inorg Chem

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We describe the synthesis, crystal structures, and optical absorption spectra/colours of 3d transition‐metal‐substituted lyonsite‐type oxides Li3Al1–xMIIIx(MoO4)3 (0 < x ≤ 1.0; MIII = Cr, Fe) and Li3–xAl1–xMII2x(MoO4)3 (0 < x ≤ 1.0; MII = Co, Ni, Cu). The oxides were readily synthesized by the solid‐state reaction of stoichiometric mixtures of the constituent binaries at around 700 °C in air. The crystal structures determined by Rietveld refinement of PXRD data revealed that in the smaller trivalent‐metal‐substituted lyonsite oxides, the MIII ions occupy the octahedral (8d, 4c) sites and the lithium ions occur exclusively at the trigonal‐prismatic (4c) site in the orthorhombic (Pnma) structure. On the other hand, larger divalent‐metal (CoII/CuII)‐substituted derivatives show occupancy of the CoII/CuII ions at both the octahedral and trigonal‐prismatic sites. We have investigated the colours and optical absorption spectra of Li3Al1–xMIIIx(MoO4)3 (MIII = Cr, Fe) and Li3–xAl1–xMII2x(MoO4)3 (MII = Co, Ni, Cu) and interpreted the results in terms of the average crystal field strengths experienced by MIII/MII ions in multiple coordination geometries. We have also identified the role of metal‐to‐metal charge transfer (MMCT) from the partially filled transition metal 3d orbitals to the empty Mo 4d orbitals in the resulting colours of these oxides.

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Section: Resultssupporting

confidence: 81%

Section: Resultsmentioning

confidence: 94%

Unique Colours of 3d‐Transition‐Metal‐Substituted Lyonsite Molybdates and Their Derivatives: The Role of Multiple Coordination Geometries and Metal‐to‐Metal Charge Transfer

Laha¹,

Natarajan²,

Gopalakrishnan³

2016

Eur J Inorg Chem

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“…Recently, research is focusing on the tunable solid-state laser crystals in visible and near infrared spectrum region for flash lamping and diode laser pumping. The Cr 3+ -doped molybdate crystals have gained interest because they have broad emission bands and larger absorption and emission cross-sections [10]–[12].…”

Section: Introductionmentioning

confidence: 99%

Growth, Mechanical, Thermal and Spectral Properties of Cr3+∶MgMoO4 Crystal

Huang

Zhang

et al. 2012

PLoS ONE

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This paper reports the growth, mechanical, thermal and spectral properties of Cr3+∶MgMoO4 crystals. The Cr3+∶MgMoO4 crystals with dimensions up to 30 mm×18 mm×14 mm were obtained by TSSG method. The absorption cross-sections of 4A2→4T1 and 4A2→4T2 transitions are 12.94×10−20 cm2 at 493 nm and 7.89×10−20 cm2 at 705 nm for E//Ng, respectively. The Cr3+∶MgMoO4 crystal shows broad band emission extending from 750 nm to 1300 nm with peak at about 705 nm. The emission cross-section with FWHM of 188 nm is 119.88×10−20 cm2 at 963 nm for E//Ng. The investigated results showed that the Cr3+∶MgMoO4 crystal may be regarded as a potential tunable laser gain medium.

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“…Since tunable solid-state lasers have a wide field application in medicine, ultra short pulse generation, environment and communication, research on Cr 3+ -doped tunable solid-state laser in the visible and near infrared spectrum has gained strong interest [1][2][3][4][5]. Recently double metals molybdate and tungstate with a general formula M I M III (M VI O 4 ) 2 (where M I = Na, K, Rb, Cs, M III = Al, In, Sc and M VI = Mo, W)are gaining attentions because their interesting chemical and physical properties.…”

Section: Introductionmentioning

confidence: 99%