In situ sol–gel composition of inorganic/organic polymeric hybrid precursors to synthesize red-luminescent CaTiO3:Pr3+ and CaTi0.5Zr0.5O3:Pr3+ phosphors

Structural refinement and photoluminescence properties of irregular cube-like (Ca1−xCux)TiO3 microcrystals synthesized by the microwave–hydrothermal method

“…CaTiO 3 is known through its use as the host of rare earth-doped, for its applications in integrated light-emission devices, field emission displays (FED's), and all-solid compact laser devices operating in the blueegreen region and positive temperature coefficient (PTC) resistors [13]. The demand for high-resolution and efficiency of waveguides, lamps and other optical devices has stimulated the discovery of new luminescent materials with enhanced properties [14].…”

Combustion synthesis and luminescent properties of CaTiO3: Pr, Al persistent phosphors

“…Orthorhombic praseodymium-doped calcium titanate is known for several years as a red emitting phosphor characterized by a single emission peak with chromaticity coordinates positioned at x = 0.680 and y = 0.311, very close to the coordinates of the "ideal red" [1,2]. In recent years, much work has been concentrated on this phosphor [3][4][5][6][7][8][9][10][11], which is generally characterized with one strong and sharp emission peak at about 610 nm. This is attributed to the characteristic 1 D 2 → 3 H 4 transition of Pr 3+ .…”

“…This is attributed to the characteristic 1 D 2 → 3 H 4 transition of Pr 3+ . In order to enhance the luminous properties, many researchers have studied these phosphors by varying the concentration of praseodymium [2], different charge compensators [2,8], and different synthesis methods [4,[7][8][9]. It is clear that the brightest Pr 3+ -doped calcium titanates are obtained for a doping level of 0.1 mol% and for Al 3+ chargecompensated materials processed by sol-gel procedure and sintered at 1000 • C [10].…”

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

“…Tal fato está relacionado à maior eficiência na transferência de carga da matriz hospedeira para o íon terra-rara emissor, Pr 3+ . Essa intensa emissão FL do Pr 3+ é reportada para CT dopado com esse íon [1,10,52]. A Fig.…”

“…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].…”