Luminescence spectra of SrTiO3:Mn4+

Bryknar, Z.; Трепаков, В. А.; Potůček, Z.; Jastrabı́k, L.

doi:10.1016/s0022-2313(99)00325-7

Cited by 94 publications

(77 citation statements)

References 7 publications

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“…The emission bands enhanced and suppressed with increasing temperature can be attributed to anti-Stokes and Stokes bands, respectively. 18 Although STO:Mn 4+ also showed emission at 10 K as reported in literature, 17 the intensities of LMT:Mn 4+ and LZT:Mn 4+ were higher than that of STO:Mn 4+ by 30 and 15 times, respectively, as shown in Figure 2a. Figure 2b shows the temperature dependence of emission peak intensity for Mn 4+ -activated LMT, LZT, and STO in the region of 10300 K. Thermal quenching temperature (T q ) is defined as the temperature at which the emission intensity quenches to 50% of that at 10 K. T q of these phosphors increases in the order of STO:Mn 4+ (43 K) ¹ LZT:Mn 4+ (225 K) < LMT:Mn 4+ (260 K).…”

Section: +supporting

confidence: 71%

“…-activated LMT and LZT exhibited PL at room temperature (RT), as shown in Figure 1 17 The PL spectra of Mn 4+ -activated perovskite-type titanates were also measured at low temperatures (10300 K) to know their further properties ( Figure S3). In LMT:Mn 4+ (0.2 atom %), with increasing temperature, the emission at shorter wavelengths than 690 nm was enhanced while that beyond 690 nm decreased.…”

Section: +mentioning

confidence: 99%

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Photoluminescence Properties of Mn⁴⁺-activated Perovskite-type Titanates, La₂MTiO₆:Mn⁴⁺(M = Mg and Zn)

Takeda¹,

Kato²,

Kobayashi

et al. 2015

Chem. Lett.

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). LMT and LZT substituted with 01 atom % of Mn with respect to Ti were synthesized by a polymerizable complex (PC) method.13 Titanium tetrabutoxide and nitrates of La, Mg, Zn, and Mn were used as raw materials. Citric acid and propylene glycol were also used as chelating and esterification reagents, respectively. The obtained precursors were fired at 1773 K for LMT:Mn 4+ , and at 1573 K for LZT:Mn 4+ for 2 h in air.SrTiO 3 :Mn 4+ (0.2 atom %) was also synthesized by the PC method for comparison. The obtained samples were characterized by X-ray diffraction analysis (XRD, Bruker AXS; D2 Phaser), diffuse reflectance spectroscopy in an ultraviolet visible region (UVvis DRS, Shimadzu; UV-3100) and PL spectroscopy at room temperature (Hitachi; F-4500 and JASCO; FP-6500). PL spectra at low temperature (10300 K) were also taken using a fluorescence spectrometer (Horiba; FluoroLog-3) with a cryostat. Excitation spectra were monitored for emission at 710 nm, whereas the emission spectra for LMT:Mn 4+ and LZT:Mn 4+ were taken with excitation at 340 and 360 nm, respectively. The band structures were determined by a density functional theory (DFT) using a CASTEP program.The XRD patterns indicated that the samples were obtained in a pure LMT or LZT phase with ordered B-site ( Figure S1). 14,15 No obvious changes in the peak intensity ratio and peak positions were seen with the substitution of Mn 4+ because the quantities of Mn 4+ substituted were very small (x = 0 1 atom %). When LZT was fired at 1673 K and higher temperature, La 2 TiO 5 of an impurity phase was formed accompanying with the volatilization of the Zn component. Therefore, the optimized firing temperature for LZT was 1573 K.

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Section: +supporting

confidence: 71%

Section: +mentioning

confidence: 99%

Photoluminescence Properties of Mn⁴⁺-activated Perovskite-type Titanates, La₂MTiO₆:Mn⁴⁺(M = Mg and Zn)

Takeda¹,

Kato²,

Kobayashi

et al. 2015

Chem. Lett.

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“…Estes sistemas foram abordados devido ao seu potencial em aplicações óptico-eletrônicas [4]. A FL foi estudada à baixa temperatura (T=15K) em cristais de SrTiO 3 dopados com manganês e sob excitação com laser de 532 nm [5]. O comportamento luminescente do íon Mn 4+ , como impureza na estrutura perovsquita ABO 3 , foi analisado.…”

Section: Introductionunclassified

O papel dos modificadores de rede na produção da fotoluminescência no CaWO4

et al. 2004

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INTRODUÇÃOO desenvolvimento de materiais semicondutores, com propriedades ópticas ativas como fotoluminescência (FL), eletroluminescência, ou propriedades ópticas não lineares pode conduzir a novos dispositivos com desempenho superior ou a diferentes modos de atuação [1,2]. Neste sentido, tem havido atualmente um interesse muito grande, no estudo da FL, em materiais amorfos ou materiais não estruturados. Isso é confirmado pelo intenso esforço de pesquisa, que vem sendo feito no estudo de vários tipos de FL visível, em temperatura ambiente, como por exemplo no caso do silício poroso [3]. ResumoDiscutiu-se a fotoluminescência para o tungstato de cálcio amorfo, observada à temperatura ambiente. Verificou-se que há concordância entre os resultados experimentais e teóricos. Neste trabalho foram simuladas as estruturas cristalinas e amorfas do tungstato de cálcio (CaWO 4 ), comparando-se as respectivas estruturas eletrônicas. Os resultados dos cálculos teóricos indicam a formação de novos níveis de energia na banda de valência e de condução do amorfo. Estes níveis eletrônicos extras são os responsáveis pela formação da cauda na curva do espectro de absorção. Correspondentemente, medidas experimentais de absorção óptica mostraram a presença da cauda, com relação ao espectro do cristalino. Desta forma, pode-se interpretar a formação da cauda, como sendo associada aos defeitos promovidos na estrutura desordenada do material amorfo. Palavras-chave: fotoluminescência, processamento químico, mecânica quântica. Abstract

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“…8,9 For instance in the oxide phosphors, GdAlO 3 :Mn 4+ , SrTiO 3 :Mn 4+ and Y 2 Sn 2 O 7 :Mn 4+ the emission is well beyond 650 nm and thus unsuitable for visible displays or lighting. [10][11][12] The interest in K 2 SiF 6 :Mn 4+ as a red phosphor started with the development of a synthesis method by Adachi and Takahashi, etching Si wafers in HF in the presence of KMnO 4 . 13,14 This ambient wet chemical synthesis is cost effective compared to standard phosphor syntheses, which take place at high firing temperatures in controlled * Electrochemical Society Active Member.…”

mentioning

confidence: 99%

Luminescent Behavior of the K₂SiF₆:Mn⁴⁺Red Phosphor at High Fluxes and at the Microscopic Level

Sijbom

Joos

Martin

et al. 2015

ECS J. Solid State Sci. Technol.

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Phosphor-converted white light-emitting diodes (LEDs) are becoming increasingly popular for general lighting. The non-rare-earth phosphor K 2 SiF 6 :Mn 4+ , showing promising saturated red d-d-line emission, was investigated. To evaluate the application potential of this phosphor, the luminescence behavior was studied at high excitation intensities and on the microscopic level. The emission shows a sublinear behavior at excitation powers exceeding 40 W/cm 2 , caused by ground-state depletion due to the ms range luminescence lifetime. The thermal properties of the luminescence in K 2 SiF 6 :Mn 4+ were investigated up to 450 K, with thermal quenching only setting in above 400 K. The luminescence lifetime decreases with increasing temperature, even before thermal quenching sets in, which is favorable to counteract the sublinear response at high excitation intensity. A second, faster, decay component emerges above 295 K, which, according to crystal field calculations, is related to a fraction of the Mn 4+ ions incorporated on tetragonally deformed lattice sites. A combined investigation of structural and luminescence properties in a scanning electron microscope using energy-dispersive X-ray spectroscopy and cathodoluminescence mappings showed both phosphor degradation at high fluxes and a preferential location of the light outcoupling at irregularities in the crystal facets. The use of K 2 SiF 6 :Mn 4+ in a remote phosphor configuration is discussed. Most phosphor-converted white LEDs contain phosphors doped with rare earths such as divalent europium and trivalent cerium. These ions feature relatively broad emission bands based on the parity allowed 5d-4f transition. They are often easily excited with blue light and can show high quantum efficiency, even at elevated temperature. To improve the color rendering of white LEDs, red phosphors are added to the traditional blue LED and yellow Y 3 Al 5 O 12 :Ce (YAG:Ce) phosphor combination. These red phosphors need to be stable and have a high quantum efficiency. The emission spectrum should both be sufficiently red (>600 nm) and well within the eye sensitivity curve, to obtain a high luminous efficacy.1 Sulfide phosphors doped with Eu 2+ , such as (Ca,Sr)S:Eu 2+ are known for their efficient red emission, 2 but they lack stability in humid environments and the eye sensitivity is low for part of their broad emission band.3 Nitride phosphors doped with Eu 2+ are often chemically more stable, but their synthesis at high pressure and temperature is a drawback.4 Most europium-doped nitride phosphors show a relatively broad emission band. 5,6 Cost and supply issues of the rare-earth materials pave the way for transition-metal-doped phosphors. 7 In particular the Mn 4+ ion is a promising alternative for Eu 2+ as it shows line emission from parity and spin-forbidden d-d transitions in the red and near-infrared spectral region. Investigation of the optical properties of the Mn 4+ dopant showed that fluoride hosts are preferred for LED phosphors over oxide hosts, since only the io...

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Luminescence spectra of SrTiO3:Mn4+

Cited by 94 publications

References 7 publications

Photoluminescence Properties of Mn⁴⁺-activated Perovskite-type Titanates, La₂MTiO₆:Mn⁴⁺(M = Mg and Zn)

Photoluminescence Properties of Mn⁴⁺-activated Perovskite-type Titanates, La₂MTiO₆:Mn⁴⁺(M = Mg and Zn)

O papel dos modificadores de rede na produção da fotoluminescência no CaWO4

Luminescent Behavior of the K₂SiF₆:Mn⁴⁺Red Phosphor at High Fluxes and at the Microscopic Level

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Luminescence spectra of SrTiO3:Mn4+

Cited by 94 publications

References 7 publications

Photoluminescence Properties of Mn4+-activated Perovskite-type Titanates, La2MTiO6:Mn4+(M = Mg and Zn)

Photoluminescence Properties of Mn4+-activated Perovskite-type Titanates, La2MTiO6:Mn4+(M = Mg and Zn)

O papel dos modificadores de rede na produção da fotoluminescência no CaWO4

Luminescent Behavior of the K2SiF6:Mn4+Red Phosphor at High Fluxes and at the Microscopic Level

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Product

Resources

About

Photoluminescence Properties of Mn⁴⁺-activated Perovskite-type Titanates, La₂MTiO₆:Mn⁴⁺(M = Mg and Zn)

Photoluminescence Properties of Mn⁴⁺-activated Perovskite-type Titanates, La₂MTiO₆:Mn⁴⁺(M = Mg and Zn)

Luminescent Behavior of the K₂SiF₆:Mn⁴⁺Red Phosphor at High Fluxes and at the Microscopic Level