Red photoluminescence spectrum of CuAlS2 : Mn

Sato, K.; Murakami, Masahiko; Okamoto, Satoru; Morita, Shigenori; Kambara, Takeshi; Gondaira, Ken Ichiro; Takenoshita, Hiroshi

doi:10.1016/0146-3535(84)90050-9

Cited by 19 publications

(6 citation statements)

References 17 publications

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“…Well-known phosphors include [Zn(Mn)] 2 SiO 4 , [1] but, depending on the coordination environment, either green (tetrahedrally coordinated Mn 2 + ) or red to pink (octahedrally coordinated Mn 2 + ) luminescence can also be observed from simple halogenido complexes. [2,3] Besides photoluminescence, triboluminescence [4,5] as well as electroluminescence [6][7][8][9][10][11] have also been observed for certain tetraalkylammonium salts. In a high proportion of the studied optically active manganate(II) salts, the counter cations have been organic ammonium ions.…”

Section: Mnmentioning

confidence: 94%

Synthesis, Structure, and Physico‐optical Properties of Manganate(II)‐Based Ionic Liquids

Pitula

Mudring

2010

Chemistry A European J

117

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Several ionic liquids (ILs) based on complex manganate(II) anions with chloro, bromo, and bis(trifluoromethanesulfonyl)amido (Tf(2)N) ligands have been synthesized. As counterions, n-alkyl-methylimidazolium (C(n)mim) cations of different chain length (alkyl=ethyl (C(2)), propyl (C(3)), butyl (C(4)), hexyl (C(6))) were chosen. Except for the 1-hexyl-3-methylimidazolium ILs, all of the prepared compounds could be obtained in a crystalline state at room temperature. However, each of the compounds displayed a strong tendency to form a supercooled liquid. Generally, solidification via a glass transition took place below -40 degrees C. Consequently, all of these compounds can be regarded as ionic liquids. Depending on the local coordination environment of Mn(2+), green (tetrahedrally coordinated Mn(2+)) or red (octahedrally coordinated Mn(2+)) luminescence emission from the (4)T(G) level is observed. The local coordination of the luminescent Mn(2+) centre has been unequivocally established by UV/Vis as well as Raman and IR vibrational spectroscopies. Emission decay times measured at room temperature in the solid state (crystalline or powder) were generally a few ms, although, depending on the ligand, values of up to 25 ms were obtained. For the bromo compounds, the luminescence decay times proved to be almost independent of the physical state and the temperature. However, for the chloro- and bis(trifluoromethanesulfonyl)amido ILs, the emission decay times were found to be dependent on the temperature even in the solid state, indicating that the measured values are strongly influenced by nuclear motion and the vibration of the atoms. In the liquid state, the luminescence of tetrahedrally coordinated Mn(2+) could only be observed when the tetrachloromanganate ILs were diluted with the respective halide ILs. However, for [C(3)mim][Mn(Tf(2)N)(3)], in which Mn(2+) is in an octahedral coordination environment, a weak red emission from the pure compound was found even in the liquid state at elevated temperatures.

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Section: Mnmentioning

confidence: 94%

Synthesis, Structure, and Physico‐optical Properties of Manganate(II)‐Based Ionic Liquids

Pitula

Mudring

2010

Chemistry A European J

117

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“…By contrast, the emission band of the [Mn] Al -doped sample rather lies at a longer wavelength of 640 nm, and is slightly broader than that of the [Mn] Cu -doped sample. These orange and red emission bands have not been reported yet, 10,11,13,20) and are thought to be the intrinsic emission bands due to the [Mn] Cu and [Mn] Al centers, respectively. Both emission bands are thought to be attributed to the 3d 5 -3d 5 internal transition from 4 T 1 to 6 A 1 in Mn 2þ centers occupying the Cu or Al site.…”

Section: Photoluminescence and Pl Excitation Characteristicsmentioning

confidence: 86%

“…9) It has been reported that Mn-doped CuAlS 2 shows red luminescence and has a relatively strong excitation band in the near-UV wavelength. 10,11) The red powder electroluminescence using CuAlS 2 :Mn has also been reported. 12) Recently, we have succeeded in synthesizing CuAlS 2 :Mn by a solid-statereaction method in an open-tubular furnace at atmospheric pressure.…”

Section: Introductionmentioning

confidence: 90%

“…These peaks are thought to be attributed to the 3d 5 -3d 5 electron transition from 6 A 1 to ð 4 A 1 ; 4 EÞ, and that from 6 A 1 to 4 T 2 of the Mn 2þ centers, respectively. 11) The PLE intensity increases with the Mn content and approaches its maximum at a Mn content of 0.05. With further increase in Mn content above 0.05, the PLE intensity markedly decreases.…”

Section: Photoluminescence and Pl Excitation Characteristicsmentioning

confidence: 95%

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Photoluminescent Characteristics of Mn²⁺ Centers Selectively Substituted for Different Cations in CuAlS₂

Miyamoto¹,

Honma²,

Ohmi³

2011

Jpn. J. Appl. Phys.

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A selective substitution of Mn2+ centers for different cations has been attempted in CuAlS2 powder samples. From the theoretical curve fittings of the extended X-ray absorption fine structure oscillations, it has been confirmed that most Mn is incorporated as divalent into one site of Cu or Al, as intended. The Mn2+ centers substituted for Cu show an orange photoluminescence with a peak wavelength of 600 nm. This orange emission has a single exponential decay curve with a decay constant of 1.0 ms. By contrast, the Mn2+ centers substituted for Al show a red emission peaking at 640 nm and have a nonexponential decay curve with a decay constant of 100 µs. This fast emission is thought to be due to the intrinsic luminescence of the 3d5–3d5 transition in Mn2+ centers occupying the Al site. The currently obtained external quantum efficiency is about 40% under 360 nm excitation at room temperature.

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“…Novotortsev et al [12] studied CuGaTe 2 Mn and reported Mn 2+ ions containing Mn on one or two cation sites and superparamagnetic clusters. Sato et al [13] studied the 5 mole% Mn doped CGS single crystal having no photoluminescence (PL) and no fine structures can be observed below the absorption edge. Mn can be incorporated into the chalcopyrite of the CGS lattice by suitably adjusting the growth parameters.…”

Section: Introductionmentioning

confidence: 99%

Influence of Mn doping on CuGaS₂ single crystals grown by CVT method and their characterization

Prabukanthan¹,

Dhanasekaran²

2008

J. Phys. D: Appl. Phys.

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1 and 2 mole% of Mn doped CuGaS2 (CGS) single crystals were grown by the chemical vapour transport (CVT) technique using iodine as the transporting agent. The analysis of the single crystal x-ray diffraction data suggests that the doping of 1 and 2 mole% Mn in the CGS single crystal does not affect the tetragonal (chalcopyrite) crystal structure. The optical absorption spectrum shows that the Mn ion induces a very strong absorption band in the UV–visible–near IR regions. The values of the crystal parameter (Dq) and the Racah parameter (B) calculated from the absorption spectra show d electron delocalization in the host crystal CGS. Room temperature photoluminescence spectra of undoped CGS only exhibited a band–band emission. But 1 and 2 mole% Mn doped CGS single crystals show two distinct CGS and Mn2+ related emissions, both of which are excited via the CGS host lattice. Raman spectra of 1 and 2 mole% Mn doped CGS single crystals exhibit a high intensity peak of the A1 mode at 310 cm−1 and 300 cm−1, respectively. EDAX, optical absorption and Raman spectrum studies reveal that Mn2+ ions are substituted in the Ga3+ ions and incorporated into the CGS lattice. The magnetization of Mn doped CGS single crystals was measured as a function of the magnetic field and temperature. Paramagnetic behaviour typical of spin S = 5/2 expected for Mn2+ (d5) magnetic centres was observed in the temperature range 2 K < T < 300 K. In Mn doping, the increase in bulk conductivity of the Mn doped CGS single crystals at room temperature indicates an increase in the hole concentration.

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Red photoluminescence spectrum of CuAlS2 : Mn

Cited by 19 publications

References 17 publications

Synthesis, Structure, and Physico‐optical Properties of Manganate(II)‐Based Ionic Liquids

Synthesis, Structure, and Physico‐optical Properties of Manganate(II)‐Based Ionic Liquids

Photoluminescent Characteristics of Mn²⁺ Centers Selectively Substituted for Different Cations in CuAlS₂

Influence of Mn doping on CuGaS₂ single crystals grown by CVT method and their characterization

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Red photoluminescence spectrum of CuAlS2 : Mn

Cited by 19 publications

References 17 publications

Synthesis, Structure, and Physico‐optical Properties of Manganate(II)‐Based Ionic Liquids

Synthesis, Structure, and Physico‐optical Properties of Manganate(II)‐Based Ionic Liquids

Photoluminescent Characteristics of Mn2+ Centers Selectively Substituted for Different Cations in CuAlS2

Influence of Mn doping on CuGaS2 single crystals grown by CVT method and their characterization

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Product

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Photoluminescent Characteristics of Mn²⁺ Centers Selectively Substituted for Different Cations in CuAlS₂

Influence of Mn doping on CuGaS₂ single crystals grown by CVT method and their characterization