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Synthesis and Photoluminescence Properties of Ti4+ and Eu3+ Doped or Codoped M2SnO4（M=Ca, Sr, Ba） Phosphors

Author: ZhangHanZuo
Tutor: FuShiLiu
School: Shantou University
Course: Materials Physics and Chemistry
Keywords: M2SnO4: Ti4 M = Ca, Sr, Ba M2SnO4: Eu3 M = Ca, Sr, Ba M2SnO4: (Eu3, Ti4) M = Ca, Sr, Ba Luminescence characteristics Charge transfer
CLC: TB34
Type: Master's thesis
Year: 2009
Downloads: 39
Quote: 0
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Abstract


Using high-temperature solid-state reaction of M 2 SnO 4 : Ti 4 (M = Ca, Sr, Ba), M 2 SnO 4 : Eu 3 (M = Ca, Sr, Ba) and M 2 SnO 4 : (Eu 3 , Ti 4 ) (M = Ca, Sr, Ba) light, X-ray diffraction techniques, such as fluorescence spectroscopy and lifetime testing by means of structure and luminescence properties of the samples were studied. XRD results show that M 2 SnO 4 (M = Ca, Sr, Ba) single-doped Ti 4 and Eu 3 , or two co-doped ions did not change the crystal structure of the matrix. M 2 SnO 4 : Ti 4 (M = Ca, Sr, Ba) samples in the blue light region was produced Ti 4 -O 2 - broadband emission, peaking at 22700cm -1 , 24100cm -1 and 23500cm -1 < / sup>, of which Ca 2 SnO 4 : Ti 4 emission samples strongest, Ba 2 SnO 4 : Ti 4 emission intensity of the smallest sample. In M 2 SnO 4 : Ti 4 (M = Ca, Sr, Ba) samples, O 2 - with Ti 4 ion excitations between the existence of two bands in the ultraviolet excitation peak, for strong excitation peak, Ca 2 SnO 4 : Ti 4 position of the sample (35900cm -1 ) between Ba 2 SnO 4 : Ti 4 (35400cm -1 ) and Sr 2 SnO 4 : Ti 4 (36500cm -1 ) between; while for weak excitation peak, Ca 2 SnO 4 : Ti 4 energy level position ( 39500cm -1 ) were higher than Ba ?? 2 SnO 4 : Ti 4 (37900cm -1 < / sup>) and Sr 2 SnO 4 : Ti 4 (39200cm -1 ). Having a one-dimensional chain structure Ca 2 SnO 4 : Ti 4 luminous body, Ti 4 - O 2 - charge transfer luminescence lifetime of 2.66μs, and in two-dimensional layered structure of Sr 2 SnO 4 : Ti 4 and Ba 2 SnO 4 : Ti 4 luminous body, Ti 4 -O 2 - of the luminescence lifetime is increased to 3.7μs so. In M 2 SnO 4 : Eu 3 (M = Ca, Sr, Ba) luminous body, Ca 2 SnO 4 : Eu 3 emission intensity maximum. Ca 2 SnO 4 : Eu3 luminous body emits electric dipole transition 5 D 0 - 7 F 2 -based, Sr 2 SnO 4 : Eu 3 phosphor containing significant 5D0-7F1 and 5D0 - 7F2 transition emission, while Ba 2 SnO 4 : Eu 3 is mainly for the 5D0 - 7F1 transition emission. M 2 SnO 4 : Eu 3 (M = Ca, Sr, Ba) in the ultraviolet band exists Eu 3 -O 2 - charge transfer absorption band, with Eu 3 dopant concentration, the charge transfer absorption band are red shift. Emission spectra, excitation spectra and fluorescence decay experimental results show that the Ca 2 SnO 4 : Eu 3 in the sample, Eu 3 ions replace Ca2 ions position; in Sr 2 SnO 4 : Eu 3 and Ba2 SnO4: Eu 3 < / sup> samples, Eu 3 ions were replaced Sr2 / Ba2 and Sn4, which occupy two different Sites of. In Ca 2 SnO 4 : Eu 3 in then mixed Ti 4 ion, Eu 3 < / sup> ions 5D0-7F0 and 5D0-7F2 transition emission intensity significantly enhanced. Ca 2 SnO 4 : (Eu 3 , Ti 4 ) emission spectra of composition with Eu 3 doping concentration have a great change, when Eu 3 doping concentration is low, the simultaneous existence of the sample Ti 4 -O 2 - Blu-ray emission and Eu 3 red emission; when Eu 3 doping concentration is high, there is only a sample Eu 3 < / sup> ions red emission. By changing the Eu 3 -doping concentration, the emission light can be adjusted to white light from blue light, then to red. Ti 4 -O 2 - blue glowing life is about 2.83μs, its energy comes from O 2 - and Ti 4 ions charge transfer absorption; while Eu 3 red glowing life is about 1275μs, it corresponds to broadband UV absorption peak at 275nm or so. Ti 4 and Eu 3 ion energy transfer phenomenon may exist. For Eu 3 and Ti 4 co-doped Sr 2 SnO 4 and Ba 2 SnO 4 samples, when Eu 3 doping concentration is low, the sample clearly exists Ti 4 -O 2 - charge transfer emission and Eu 3 of 5 D 0 - 7 F 1 transition emission. When Eu 3 ion doping concentration is high, Ti 4 -O 2 - emission is very weak, and Eu 3 reduction in the emission intensity. In Sr 2 SnO 4 : (Eu 3 , Ti 4 ) samples, Ti 4 < / sup>-O 2 - and Eu 3 emission energy are derived from the Ti 4 -O 2 - of charge-transfer absorption; while in Ba 2 SnO 4 : (Eu 3 , Ti 4 ) samples, Ti 4 -O 2 - emission energy comes from Ti 4 -O 2 - of the charge-transfer absorption, Eu 3 ions emitted energy from Eu 3 -O 2 - of the charge-transfer absorption.

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