Spectroscopic characterization of photoinduced<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mi mathvariant="normal">Mn</mml:mi></mml:mrow><mml:mrow><mml:mn>5</mml:mn><mml:mo>+</mml:mo></mml:mrow></mml:msup></mml:mrow></mml:math>ions in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">YAlO</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msub></mml:

Noginov, M. A.; Loutts, G. B.; Ногинова, Н.; Hurling, S.; Kück, S.

doi:10.1103/physrevb.61.1884

Cited by 31 publications

(31 citation statements)

References 23 publications

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“…As seen from the figure, spectra of the stoichiometric and non-stoichiometric crystals are practically identical. The spectra confirm presence of Mn 4+ ions (the band centered at about 21,000 cm À1 caused 4 A 2 -4 T 2 transition [7]) and Mn 5+ ions (bands near 12,000, 15,000, 18,000 and $26,000 cm À1 caused by the transitions 3 T 1 ( 3 F)-3 T 2 ( 3 F), 3 T 1 ( 3 F)-3 T 1 ( 3 P) and 3 T 1 ( 3 F)-3 A 2 ( 3 F) [11]) in the as-grown crystals. A spectrum of the photocolored sample with the increased absorption of Mn 5+ ions is also present in the figure for clarity.…”

Section: Influence Of Mno or Mno 2 Doping On The Manganese Incorporatmentioning

confidence: 98%

Technological approaches for improving thermoluminescent properties of the Czochralski-grown YAlO3:Mn crystals

Zhydachevskii

Suchocki

Berkowski

et al. 2008

Journal of Crystal Growth

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Section: Influence Of Mno or Mno 2 Doping On The Manganese Incorporatmentioning

confidence: 98%

Technological approaches for improving thermoluminescent properties of the Czochralski-grown YAlO3:Mn crystals

Zhydachevskii

Suchocki

Berkowski

et al. 2008

Journal of Crystal Growth

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“…The bluish-gray coloration of YAP:Mn under the laser illumination is associated with Mn 5þ ions that are created as a result of the photoionization process Mn 4þ -Mn 5þ þ e À : This photoionization takes place as a two-photon process [2,7]. The photoinduced absorption bands in visible centered at 15; 500 cm À1 ð640 nmÞ and 18; 500 cm À1 ð540 nmÞ correspond to Mn 5þ ð3d 2 ) ions ( 3 T 1 ð 3 FÞ-3 T 1 ð 3 PÞ transition) in octahedral coordination [8]. The photoinduced Mn 5þ ions most probably are also responsible for the UV absorption band near 27; 000 cm À1 ð370 nmÞ induced by the laser illumination [8].…”

Section: Introductionmentioning

confidence: 99%

“…The photoinduced absorption bands in visible centered at 15; 500 cm À1 ð640 nmÞ and 18; 500 cm À1 ð540 nmÞ correspond to Mn 5þ ð3d 2 ) ions ( 3 T 1 ð 3 FÞ-3 T 1 ð 3 PÞ transition) in octahedral coordination [8]. The photoinduced Mn 5þ ions most probably are also responsible for the UV absorption band near 27; 000 cm À1 ð370 nmÞ induced by the laser illumination [8]. It is supposed that an electron released as a result of ionization of Mn 4þ ion can be captured by some traps available in the crystal.…”

Section: Introductionmentioning

confidence: 99%

Radiation and thermally induced effects in YAlO3:Mn crystals

Zhydachevskii

Durygin

Suchocki

et al. 2004

Journal of Luminescence

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“…The commonly used activators are typically multivalent ions, which can insert multiple electronic states inside the bandgap of the host material. 45 Good examples of the multivalent ions that can act as luminescent centers are rare-earth ions (e.g., Ce 3+ , Eu 2+ ), [6][7][8][9][10][11] transition metal ions (e.g., Cr 3+ , Mn 4+ ), [12][13][14][15][16][17] and ns 2 ions (ions with outer electron configuration of ns 2 , such as Tl + , Sn 2+ ). [18][19][20] Energy efficiency is critically important for phosphors used for lighting.…”

mentioning

confidence: 99%

Using DFT Methods to Study Activators in Optical Materials

2015

ECS J. Solid State Sci. Technol.

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Density functional theory (DFT) calculations of various activators (ranging from transition metal ions, rare-earth ions, ns 2 ions, to self-trapped and dopant-bound excitons) in phosphors and scintillators are reviewed. As a single-particle ground-state theory, DFT calculations cannot reproduce the experimentally observed optical spectra, which involve transitions between multi-electronic states. However, DFT calculations can generally provide sufficiently accurate structural relaxation and distinguish different hybridization strengths between an activator and its ligands in different host compounds. This is important because the activator-ligand interaction often governs the trends in luminescence properties in phosphors and scintillators, which can be used to search for new materials. DFT calculations of the electronic structure of the host compound and the positions of the activator levels relative to the host band edges in scintillators are also important for finding optimal host-activator combinations for high light yields and fast scintillation response. Mn 4+ Luminescence of materials when excited by photons or ionizing radiation is the foundation for numerous technologies, such as energy efficient lighting (fluorescent lamps and white LEDs), laser, medical imaging, and nuclear materials detection.1-3 Efficient luminescence in semiconductors and insulators usually relies on the localization of excited electrons and holes at certain impurities, which act as luminescence centers (or activators). An activator can trap electrons and holes for efficient radiative recombination and is the essential component of a phosphor or scintillator material. The commonly used activators are typically multivalent ions, which can insert multiple electronic states inside the bandgap of the host material. 45 Good examples of the multivalent ions that can act as luminescent centers are rare-earth ions (e.g., Ce 3+ , Eu 2+ ), 6-11 transition metal ions (e.g., Cr 3+ , Mn 4+ ), [12][13][14][15][16][17] and ns 2 ions (ions with outer electron configuration of ns 2 , such as Tl + , Sn 2+ ). 18-20Energy efficiency is critically important for phosphors used for lighting. To suppress the energy loss through nonradiative recombination, a phosphor is excited by directly exciting activators, not the host (see Fig. 1a). The excitation energy is less than the bandgap energy of the host but is large enough to excite the activator. Since the excitation occurs locally at the activator, the chance for the excited activator to interact with nonradiative recombination centers, such as deep defects, is small. This is important for achieving high quantum efficiencies for phosphors. In scintillators used for detecting ionizing radiation, the radiation creates charge carriers in the valence and conduction bands of the host, which are subsequently trapped by activators, leading to radiative recombination (see Fig. 1b). In scintillators, a portion of the charge carriers need to travel a certain distance before being trapped by the activators, which ...

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Spectroscopic characterization of photoinducedMn5+ions inYAlO3

Cited by 31 publications

References 23 publications

Technological approaches for improving thermoluminescent properties of the Czochralski-grown YAlO3:Mn crystals

Technological approaches for improving thermoluminescent properties of the Czochralski-grown YAlO3:Mn crystals

Radiation and thermally induced effects in YAlO3:Mn crystals

Using DFT Methods to Study Activators in Optical Materials

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