Fast luminescence decay processes of photoexcited Eu3+ in CaS:Eu,La

Cho, Ara; Kim, So Yeon; Lee, Minyung; Kim, Sung Jin; Kim, Chang Hong; Pyun, Chong Hong

doi:10.1016/s0022-2313(00)00226-x

Cited by 18 publications

(10 citation statements)

References 22 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Several mechanisms have been proposed to interpret the dependence of dopant emission from CaS-doped phosphors [21][22][23][24]. Since both Mn 2þ and CaS host related emissions were observed in our measurements, we can consider an energy transfer mechanism for doped phosphors in more detail on the basis of lifetime variation.…”

Section: Resultsmentioning

confidence: 84%

“…They had confirmed that the excitation spectra will depend on scanning direction, pumping source intensity and irradiation history of the sample. The time-resolved spectra of CaS:Eu and CaS:Eu, La had been studied and reported decay times of Eu 2þ both in CaS:Eu and CaS:Eu, La are of the order of 560 ns at room temperature [6]. It had been shown [7,8] that thin films can be prepared from luminescent CaS:Bi powder.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Enhanced photoluminescence decay processes of doped CaS phosphors at low temperature

Bhatti

Sharma

Verma

2006

Journal of Modern Optics

View full text Add to dashboard Cite

CaS phosphor samples singly doped with Mn impurity and doubly doped withMn and X (X¼ Fe, Co and Ni) have been synthesized using a flux method. Crystal structure and phase identification of doped CaS phosphors have been carried out by X-ray diffraction (XRD) studies. A pulse excitation method has been employed to study the optical parameters of the doped phosphors. Excited state lifetime measurements at liquid nitrogen temperature were carried out with a pulsed UV laser (nitrogen laser) as the excitation source has a short pulse width (10 ns) and high peak power (200 kW per pulse). The results have been compared with room temperature lifetime studies. Enhancement in photoluminescence intensity and lifetime shortening in these synthesized doped phosphors is reported at low temperature. The lifetime values have been found to be in the microsecond time domain for CaS:Mn phosphors while on addition of a quencher impurity Ni to CaS:Mn phosphors, the lifetime values reduce to the nanosecond time domain at 77 K temperature. A thermally activated carrier transfer model has been proposed to explain the observed abnormal temperature behaviour of emission from CaS:Mn, X-doped phosphors.

show abstract

Section: Resultsmentioning

confidence: 84%

Section: Introductionmentioning

confidence: 99%

Enhanced photoluminescence decay processes of doped CaS phosphors at low temperature

Bhatti

Sharma

Verma

2006

Journal of Modern Optics

View full text Add to dashboard Cite

show abstract

“…Interference of a host matrix with a coordination shell of a central lanthanide ion brings about various effects: a change of luminescence decay time and quantum efficiency value, a shift of the emission peak and polarization effects. [14][15][16][17][18] It was revealed that Eu(III) fluorescence in some complexes can be enhanced in the presence of fluorescent inactive ions such as La(III), Gd(III), and Lu(III). This phenomenon is referred to as cofluorescence.…”

Section: Introductionmentioning

confidence: 99%

“…Cofluorescence is thought to occur through intermolecular energy transfer from the nonfluorescent donor La(III) complex to the fluorescent acceptor Eu(III) complex. 13,18 However, in spite of the great importance of these materials for application as a phosphor, the factors affecting luminescence properties are not well understood. 18 In earlier works the authors reported on a polyethylene (PE).…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Luminescent properties of PP and LDPE films and rods doped with the Eu(III)‐La(III) complex

Pogreb

Popov

Lirtsman

et al. 2006

Polymers for Advanced Techs

View full text Add to dashboard Cite

The work is devoted to luminescent properties of trivalent lanthanide complexes dispersed in thermoplastic host matrices. Polyethylene films and polypropylene-rods, both doped with these complexes, were manufactured using an extrusion technique. Two kinds of dopants were used: Eu(III)-thenoyltrifluoroacetone-1,10-phenanthroline complex (1) and Eu(III)-La(III)-1,10-phenanthroline complex (2). Absorption, excitation, emission spectra and lifetime of luminescence were studied. The impact of the polymer matrix on the emission spectra was investigated. Emission spectra of the films were studied at room and helium temperatures. Time-of-flight secondary ion mass spectrometry (TOF-SIMS) surface mapping showed that in the Eu(III)-La(III) complex europium forms islands (clusters) with a dimension of 1 mm, whereas lanthanum was dispersed more uniformly in the polymer matrix. Dependence of emission intensity on the excitation was determined.

show abstract

Effect of sintering temperature on the luminescence properties of Ca_0.8Ba_0.2TiO₃:Pr³⁺ red‐emitting phosphor

Qiu

Zhou

et al. 2014

Luminescence

View full text Add to dashboard Cite

Nanoparticles with the nominal composition Ca0.8Ba0.2Ti03:Pr(3+) were prepared using the sol-gel process. Barium nitrate, 4-hydrated calcium nitrate and praseodymium oxide were used as raw materials. The structural evolution and decomposition processes of the precursors were investigated by powder X-ray diffraction, differential thermal analysis and thermogravimetric analysis. Crystalline Ca0.8Ba0.2Ti03:Pr(3+) could be obtained at 700°C. The photoluminescence properties of the samples were investigated using excitation and emission spectra. Ca0.8Ba0.2Ti03:Pr(3+) nanoparticles showed strong red emission, which could be assigned to the typical (1) D2 →(3) H4 transition of Pr(3+). Furthermore, the study found that sintering temperature and the introduction of Ba(2+) influence the decay time of persistent luminescence.

show abstract

Fast luminescence decay processes of photoexcited Eu3+ in CaS:Eu,La

Cited by 18 publications

References 22 publications

Enhanced photoluminescence decay processes of doped CaS phosphors at low temperature

Enhanced photoluminescence decay processes of doped CaS phosphors at low temperature

Luminescent properties of PP and LDPE films and rods doped with the Eu(III)‐La(III) complex

Effect of sintering temperature on the luminescence properties of Ca_0.8Ba_0.2TiO₃:Pr³⁺ red‐emitting phosphor

Contact Info

Product

Resources

About

Fast luminescence decay processes of photoexcited Eu3+ in CaS:Eu,La

Cited by 18 publications

References 22 publications

Enhanced photoluminescence decay processes of doped CaS phosphors at low temperature

Enhanced photoluminescence decay processes of doped CaS phosphors at low temperature

Luminescent properties of PP and LDPE films and rods doped with the Eu(III)‐La(III) complex

Effect of sintering temperature on the luminescence properties of Ca0.8Ba0.2TiO3:Pr3+ red‐emitting phosphor

Contact Info

Product

Resources

About

Effect of sintering temperature on the luminescence properties of Ca_0.8Ba_0.2TiO₃:Pr³⁺ red‐emitting phosphor