Intervalence charge transfer in perovskite titanates R1/2Na1/2TiO3:Pr3+ (R=La, Gd, Y, Lu)

Boutinaud, Philippe; Sarakha, L; Mahiou, Rachid; Dorenbos, P.; Inaguma, Yoshiyuki

doi:10.1016/j.jlumin.2010.03.040

Cited by 42 publications

(30 citation statements)

References 18 publications

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“…Importantly, Fig. 1 shows that the maximum phonon wavenumber (ℏω max ) of NaGdTiO 4 is approximately 680 cm −1 , which is comparable with that of CaTiO 3 :Pr 3 and R 1∕2 Na 1∕2 TiO 3 :Pr 3 (R La, Gd, Y, Lu) [11,19].…”

mentioning

confidence: 74%

“…If an Eu 3 ion is located at a centrosymmetric site, the emission of 5 D 0 − 7 F 1 transition (near 590 nm) will be stronger and the color will tend to be on the orange side, such as the emission of the commercial red phosphor Y; GdBO 3 :Eu 3 in PDPs [9]. Comparatively, a Pr 3 ion can exhibit a prominent red luminescence in some oxidebased lattices upon UV or blue photon excitation, because of the quenching of 3 P 0 emission [10][11][12][13].…”

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confidence: 99%

“…The peaks located around 600 nm are due to 3 H 4 to 1 D 2 transitions. The 200-450 nm broadband contains two kinds of absorption: the titanate host absorption (approximately 290 nm) and the [Pr 3 − Ti 4 ] intervalence charge transfer (IVCT) band at the low energy side [10,11].…”

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confidence: 99%

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High color purity red-emission of NaGdTiO_4:Pr^3+via quenching of P_03 emission under low-voltage cathode ray excitation

et al. 2013

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A high color purity red emission is obtained in Pr(3+) activated NaGdTiO(4) (NGTP) materials. The International Commission on Illumination (CIE) chromaticity coordinates are calculated to be 0.663, 0.337, which are very close to the National Television System Committee (NTSC) red color 0.67, 0.34. The good color coordinates are due to intensive quenching of (3)P(0)-(3)H(4) emissions through the metal-to-metal intervalence charge transfer. Interestingly, the high color purity red emitting is observed not only under UV light excitation but also under low-voltage cathode ray excitation. The results indicate that NGTP may have a potential application in field emission displays.

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confidence: 74%

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High color purity red-emission of NaGdTiO_4:Pr^3+via quenching of P_03 emission under low-voltage cathode ray excitation

et al. 2013

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“…But as the temperature was raised the intensity got quenched. This phenomenon was explained by model introduced by Struck and Fonger [23] according to which for T ≥ 300 K the quenching of emission is explained on the basis of equation (1) [19,24]. Wang et al [25] studied the electro-mechano-optical conversions in Pr 3+ doped BaTiO 3 -CaTiO 3 ceramics.…”

Section: Luminescence Studies Of Some Titanatesmentioning

confidence: 99%

Luminescence studies of perovskite structured titanates: A review

Bhargavi

Khare

2015

Opt. Spectrosc.

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Apart from widely known dielectric and ferroelectric properties, the perovskite type materials also constitute a class of materials, which are recently investigated for their optical properties. These materials are being used for fabrication of various microelectronics and optoelectronic devices. Photoluminescence (PL), mechanoluminescence (ML) and thermoluminescence (TL) are such phenomena offering numerous applications in different fields like electro-optics, flat panel displays, LED technology, sensors, dynamic visualization etc.

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“…A propriedade fotoluminescente (FL) sempre despertou o interesse da comunidade científica, principalmente a partir da descoberta da fotoluminescência na temperatura ambiente, o que favorece as aplicações tecnológicas como em diodos emissores de luz (LED), lasers na região da luz visível e componentes de fibra ópticas [1][2][3][4][5]. A fim de entender e melhorar a emissão luminescente, vários estudos tem sido voltados para esses materiais através de mudanças, tais como: a variação do íon dopante [6][7][8][9][10], a concentração do íon dopante [11][12][13], a matriz hospedeira [8,[14][15][16][17][18][19], a presença de compensadores de carga [19,20] e o uso de diferentes métodos de síntese [14,[20][21][22][23][24].…”

Section: Introductionunclassified

Emissão luminescente no titanato de cálcio dopado com íons de terras-raras

et al. 2014

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Através do método dos precursores poliméricos foram sintetizadas amostras de Ca0,98Sr0,01X0,01TiO3 (X= Eu3+, Sm3+ ou Pr3+), que submetidas a diferentes tratamentos térmicos foram obtidas com níveis de ordem-desordem estrutural distintos. Os materiais sintetizados foram caracterizados por difração de raios X, confirmando a obtenção de um material homogêneo com estrutura perovsquita do tipo ortorrômbica. Essa caracterização permitiu ainda calcular o tamanho médio de cristalito das amostras, que varia em função do íon terra-rara presente. Os resultados da emissão fotoluminescente confirmaram a presença desse fenômeno óptico à temperatura ambiente e sua relação com o nível de ordem-desordem estrutural do sistema. A emissão fotoluminescente mais intensa ocorre nas amostras tratadas termicamente a 500 °C (independente do íon dopante), a variação do dopante influencia na intensidade da emissão devido à transferência de carga entre a matriz hospedeira e o íon terra-rara emissor, onde a amostra dopada com íon Pr3+ apresenta transferência de carga mais eficiente e consequentemente maior intensidade na emissão fotoluminescente. Outro fator que favorece a propriedade óptica das amostras é a compensação de carga, pois contribui para o aumento da desordem estrutural devido à formação de vacâncias do íon Ca2+.

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Intervalence charge transfer in perovskite titanates R1/2Na1/2TiO3:Pr3+ (R=La, Gd, Y, Lu)

Cited by 42 publications

References 18 publications

High color purity red-emission of NaGdTiO_4:Pr^3+via quenching of P_03 emission under low-voltage cathode ray excitation

High color purity red-emission of NaGdTiO_4:Pr^3+via quenching of P_03 emission under low-voltage cathode ray excitation

Luminescence studies of perovskite structured titanates: A review

Emissão luminescente no titanato de cálcio dopado com íons de terras-raras

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