Phosphors based on rare-earths, a new era in fluorescent lighting

Smets, B. M. J.

doi:10.1016/0254-0584(87)90103-9

Cited by 234 publications

(95 citation statements)

References 22 publications

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“…The unit-cell volume of NH 3 -400C was smallest among all samples. Moreover, the smallest lattice strain was obtained for NH 3 -400C. Based on the atomic positions in the unit-cell obtained by Rietveld refinement, bond lengths and angles are calculated and summarized in Table 2.…”

Section: Resultsmentioning

confidence: 99%

“…Based on the atomic positions in the unit-cell obtained by Rietveld refinement, bond lengths and angles are calculated and summarized in Table 2. Interestingly, NH 3 The average angle calculated with the 6 bond angles.…”

Section: Resultsmentioning

confidence: 99%

“…Condens. Matter 10(42), 9561-9580 (1998 /Dy 3+ phosphor was developed in the mid-1990s showing extremely prolonged blue-green phosphorescence (495 nm) that lasts over 20 hours [3,4]. These green and blue phosphors based on strontium aluminate are attractive options due to their long afterglow, chemical stability and high quantum yield [5], which allow for various applications for these materials such as luminescent paint, safety illumination and emergency lighting.…”

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Improved photoluminescence and afterglow of CaTiO_3:Pr^3+ by ammonia treatment

Yoon¹,

Otal²,

Maegli³

et al. 2013

Opt. Mater. Express

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Abstract:The phosphor CaTiO 3 :Pr 3+ was synthesized via a solid-state reaction in combination with a subsequent annealing under flowing NH 3 . Comparatively large off-center displacements of Ti in the TiO 6 octahedra were confirmed for as-synthesized CaTiO 3 :Pr 3 by XANES. Raman spectroscopy showed that the local crystal structure becomes highly symmetric when the powders are ammonolyzed at 400 °C. Rietveld refinement of powder X-ray diffraction data revealed that the samples ammonolyzed at 400 °C have the smallest lattice strain and at the same time the largest average Ti-O-Ti angles were obtained. The samples ammonolyzed at 400 °C also showed the smallest mass loss during the thermal re-oxidation in thermogravimetric analysis (TGA). Enhanced photolumincescence brightness and an improved decay curve as well as the highest reflectance were obtained for the samples ammonolyzed at 400 °C. The improved photoluminescence and afterglow by NH 3 treatment are explained as a result of the reduced concentration of oxygen excesses with simultaneous relaxation of the lattice strain. 2670-2673 (1996). 3. B. M. J. Smets, "Phosphors based on rare-earths, a new era in fluorescent lighting," Mater. Chem. Phys. 16(3-4), 283-299 (1987 44(6), 815-818 (1982). 38. M. Stachiotti, A. Dobry, R. Migoni, and A. Bussmann-Holder, "Crossover from a displacive to an order-disorder transition in the nonlinear-polarizability model," Phys. Rev. B Condens. Matter 47(5), 2473-2479 (1993). 39. A. Bussmann-Holder, A. R. Bishop, and G. Benedek, "Quasiharmonic periodic traveling-wave solutions in anharmonic potentials," Phys. Rev. B 53(17), 11521-11530 (1996). 40. E. A. Stern, "Character of order-disorder and displacive components in barium titanate," Phys. Rev. Lett. 93(3), 037601 (2004). 41. P. Boutinaud, E. Pinel, M. Dubois, A. P. Vink, and R. Mahiou, "UV-to-red relaxation pathways in CaTiO3:Pr 3+ ," J. Lumin. 111(1-2), 69-80 (2005 ©2013 Optical Society of America

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

mentioning

confidence: 99%

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Improved photoluminescence and afterglow of CaTiO_3:Pr^3+ by ammonia treatment

Yoon¹,

Otal²,

Maegli³

et al. 2013

Opt. Mater. Express

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“…In this context, films obtained from yttrium oxide are good candidates due to their structural and optical properties, including high dielectric constants (ε ¼ 14-18) [1], high melting points of 2410 1C [2], and high mechanical strength [3]. These films are also promising candidates as host matrices for rare-earth ions due to their special optical properties, such as the presence of luminescent centers [4], which are responsible for the enhancement of the local field around the materials [5,6]. In addition, these films have low phonon-energies of approximately 330 to 370 cm À 1 [7,8], ensuring low non-radiative losses.…”

Section: Introductionmentioning

confidence: 99%

High red emission intensity of Eu:Y2O3 films grown on Si(1 0 0)/Si(1 1 1) by electron beam evaporation

Rivera¹,

Ferri²,

et al. 2014

Journal of Luminescence

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“…and hydroxyapatite have been used as suitable humidity-sensing materials [1][2][3][4][5][6] . It should, however, be noted that these sensors are more acceptable than the traditional method (gravimetric, hygrometry, Karl-Fischer titration, wet and dry-bulb psychometric and mechanical hygrometry) because this type of humidity sensors enhance the manufacturing of sensors device by engineers.…”

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Rare Earth Phosphates as Humidity Sensors

Hanna

Ashraf

Ali

et al. 2007

Phosphorus Research Bulletin

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The aim of this work is preparation, characterization, and evaluation of some rare earth phosphates REPO 4 (RE= La, Sm, Gd) to be used as humidity sensors. Their substitution with Na + or Ca 2+ were prepared by both wet and dry methods. The produced samples were characterized by using the classical methods. The X-ray data shows that different compounds and different phases were formed depending on the method of preparation and the control conditions. The electrical conductivity of the samples were measured at 25-300°C and different relative humidity ranges of 30 to 92%. The dependence of electrical conductivity on temperature indicates that, the rare earth phosphates behave as semiconductor materials whatever they prepared by wet or dry method. It is found that the electrical conductivity of most phosphate samples increase smoothly as the relative humidity increase. This behavior may due to the protonic conduction at low humidity values and to the protonic and electrolytic conductions at high humidities. From the analysis of the obtained results, it may conclude that, the humidity sensors with high sensitivity and thermal stability could be developed from some rare earth phosphates.

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Phosphors based on rare-earths, a new era in fluorescent lighting

Cited by 234 publications

References 22 publications

Improved photoluminescence and afterglow of CaTiO_3:Pr^3+ by ammonia treatment

Improved photoluminescence and afterglow of CaTiO_3:Pr^3+ by ammonia treatment

High red emission intensity of Eu:Y2O3 films grown on Si(1 0 0)/Si(1 1 1) by electron beam evaporation

Rare Earth Phosphates as Humidity Sensors

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