Effects of Ce Concentration and Temperature on Photoluminescence Intensity in KCl:Ce<sup>3+</sup>Blue Phosphor

Tosaka, Yuki; Adachi, Sadao

doi:10.1149/2.008402jss

Cited by 16 publications

(5 citation statements)

References 23 publications

(24 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The decay time of the KCl:Ce 3+ crystal grown in the present study has been obtained to be a constant of 35.14 ± 0.17 ns, which is slightly different from that reported (30 ns) for the KCl:Ce 3+ phosphors by Tosaka et al. [ 23 ] This decay time divergence can be attributed to the Ce‐doping concentration: Higher in KCl:Ce 3+ phosphor (0.01) [ 23 ] than in KCl:Ce 3+ crystal (0.006) (present study), causing the distance between Ce ions to be greater than or equal to the critical distance at which concentration quenching would occur. Moreover, it can be understood that the XRD, PL, and TL studies made in the present study have confirmed the trivalent state of Ce 3+ ion in the KCl host lattice.…”

Section: Resultscontrasting

confidence: 99%

“…Tosaka et al. [ 23 ] have discussed the effects of Ce concentration and temperature on photoluminescence (PL) intensity in KCl:Ce 3+ blue phosphor and found that the excitation and emission peaks of the Ce 3+ :4f↔5d transitions are strongly influenced by the Ce (doping) concentration, and suggest the use of the KCl:Ce 3+ phosphor in TL dosimetry. However, most of the work has been carried out in the form of powder or small size crystals.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Luminescent and Mechanical Properties of Cerium Doped Potassium Chloride Single Crystal

Zhang

et al. 2020

Crystal Research and Technology

View full text Add to dashboard Cite

Large size cerium (Ce3+)‐doped potassium chloride single crystal is grown by the resistance heating Czochralski method and characterized structurally, mechanically, and optically by carrying out X‐ray diffraction (XRD), micro‐hardness, photoluminescence (PL), PL excitation (PLE), thermo‐luminescence (TL), and decay time measurements. XRD measurements reveal the incorporation of Ce atoms into the KCl host lattice. Microhardness measurements indicate an improvement in the hardness due to Ce3+‐doping and a decrease of hardness with increasing temperature. Two intense PL emission peaks are observed at wavelengths 343 and 367 nm, attributed, respectively, to the 5d→2F5/2 and 5d→2F7/2 transitions of Ce3+. Energy level scheme for the Ce3+ ion in the KCl crystal is proposed through PL and PLE analyses. The observed TL glow curve of KCl:Ce3+ shows a sharp peak located at about 244 °C. XRD, PL, and TL studies confirm the trivalent state of Ce3+ ion in the KCl host lattice. The luminescence decay time of KCl:Ce3+ crystal is found to be 35.14 ± 0.17 ns. The present study indicates that the KCl:Ce3+ crystal grown exhibiting suitable PL and TL emissions is expected to be a potential material for radiation dosimetry and scintillation applications.

show abstract

Section: Resultscontrasting

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Luminescent and Mechanical Properties of Cerium Doped Potassium Chloride Single Crystal

Zhang

et al. 2020

Crystal Research and Technology

View full text Add to dashboard Cite

show abstract

“…25a shows our measured room-temperature PL decay curves for the Ce 3+ emission in (Ce 3+ , Mn 2+ )-codoped CaCO 3 phosphor 128 and that in KCl:Ce 3+ phosphor. 129 Figure 25b also shows the room-temperature PL decay curves for the Mn 2+ emission in (Ce 3+ , Mn 2+ )-codoped CaCO 3 phosphor 128 and that for the Mn 4+ emission in BaSiF 6 :Mn 4+ phosphor. 52 It should be noted that the 5d 1 → 4f 1 transitions in Ce 3+ are dipole allowed, whereas the intra-d-shell transitions in Mn 2+ and…”

Section: Oxide Hostmentioning

confidence: 99%

Review—Mn⁴⁺-Activated Red and Deep Red-Emitting Phosphors

Adachi

2019

ECS J. Solid State Sci. Technol.

Self Cite

138

285

View full text Add to dashboard Cite

Mn4+-activated phosphors are a new class of non-rare earth phosphors and are alternative to commercial Eu2+-activated nitride/oxynitride phosphors with growing interest in various applications. In this review article, the structural and photoluminescence (PL) properties of various Mn4+-activated phosphors have been discussed. The host materials considered here can be roughly classified into five groups; fluorides, oxides, oxyfluorides, and two fluorine compounds. Phosphors of each group can also be classified into totally eleven subgroups from their different PL spectral features, e.g., whether an appearance of the zero-phonon line (ZPL) emission peak or not. The ZPL emission and absorption energies of the Mn4+ ions have been determined from the PL and PL excitation spectra using the Franck−Condon analysis method within the configurational-coordinate (CC) model. These results are used to obtain reliable phosphor parameters, i.e., the crystal-field (Dq) and Racah parameters (B and C), of the Mn4+ ions in the various host materials. The PL intensity vs temperature data, together with those of the luminescence lifetimes, are modeled on the basis of the CC model, and an excellent agreement has been achieved if not only the optical phonon but also the acoustic phonon contribution is taken into consideration in the conventional thermal quenching model. Effects of the hydrostatic pressure and dopant concentration on the PL spectral features are also discussed. Finally, key properties of the Mn4+-activated phosphors are discussed for use of such red and deep red-emitting phosphor systems in warm w-LED and indoor plant cultivation applications.

show abstract

“…[32,33] It can be seen from the reflectance spectra that bands corresponding to 5d-configurations of Ce 3+ overlap with the CB and were observed at longer wavelengths, indicating a reduction in E g for the Ce-doped sample. [32,33] It can be seen from the reflectance spectra that bands corresponding to 5d-configurations of Ce 3+ overlap with the CB and were observed at longer wavelengths, indicating a reduction in E g for the Ce-doped sample.…”

Section: Band Gap Energies Of Undoped and Ce-doped Srbpo 5 By Drsmentioning

confidence: 99%

“…Doping of Ce 3+ at defined excited energy levels facilitated several distinct band transitions from the higher states, not found in the undoped sample. [32,33] The excitation peaks 262 and 315 nm peaks were assigned as 2 F 5/2 → 2 T 2 and 2 F 5/ 2 → 2 E transitions. Figure 4b shows the band gap energies estimated from the reflectance spectra of undoped and 0.1 mol% Ce-doped SrBPO 5 using the Kubelka-Munk (K-M) method.…”

Section: Band Gap Energies Of Undoped and Ce-doped Srbpo 5 By Drsmentioning

confidence: 99%

Probing the optical properties and luminescence mechanism of a UV‐emitting SrBPO₅:Ce³⁺ phosphor

et al. 2019

View full text Add to dashboard Cite

Ce-doped (1 × 10 −5 to 3.0 mol%) SrBPO 5 phosphors were synthesized using a conventional solid-state reaction route at 1273 K in an air atmosphere. Phase and morphology of the samples were studied from powder X-ray diffraction (XRD) patterns and scanning electron microscope (SEM) micrographs, respectively. The band gap energies of the pure and Ce-doped SrBPO 5 phosphors were calculated from the recorded diffuse reflectance spectra. Photoluminescence (PL) and Ce 3+ lifetime were recorded at 300 and 77 K. Photoluminescence lifetime measurements revealed twolifetime values for Ce 3+ at both 300 K (17 and 36 nsec) and 77 K (12 and 30 nsec), suggesting the presence of two different environments around Ce 3+ . Time-resolved emission spectroscopy (TRES) studies confirmed the presence of Ce 3+ in two different environments. In addition, SrBPO 5 :Ce exhibited intense UV emission, signifying its possible use as an efficient sensitizer for solid-state lighting applications. The effect of γ-irradiation on PL was also determined. Thermally stimulated luminescence (TSL) glow curves of the γ-irradiated phosphor, along with trap parameters, doseresponse, and the possible TSL mechanism were also investigated. Positron annihilation lifetime spectroscopy was carried out to probe defects present in undoped and Ce-doped SrBPO 5 . KEYWORDSband gap, Ce-doped strontium borophosphate, photoluminescence, positron annihilation, thermally stimulated luminescence, trap parameters | INTRODUCTIONRare earth-doped solid-state phosphors have been given much attention due to their practical applications in various fields such as the lighting industry, biomedical fields for imaging, and the nuclear industry for scintillation and dosimetry, etc. [1][2][3] Ce 3+ with electronic configuration 4f 1 5d 0 6s 0 displays unique optical properties as an activator. [4,5] Ce 3+ emits in the UV-visible region, and the position of its lowest 5d band strongly depends on many factors such as host lattices, synthesis route, calcination temperature, and size of phosphors particles. [6][7][8][9][10] Unlike trivalent lanthanide ions, Ce 3+ 4f→5d transitions are parity allowed and show intense, broad luminescence that often sensitizes other Ln 3+ ions, enhancing their luminescence efficiency.Since the last decade, researchers have tried to synthesize an efficient green phosphor for multiple applications such as green lasers, siliconbased detectors, solar cells, fluorescence lamps, cathode ray tubes, and plasma display panels. [5,[11][12][13][14] In particular, the efficiency of green emitting Tb 3+ -doped phosphors can be remarkably enhanced by codoping with Ce 3+ in suitable hosts due to efficient energy transfer between Ce 3+ and Tb 3+ and leading to tricolour lamp

show abstract

Effects of Ce Concentration and Temperature on Photoluminescence Intensity in KCl:Ce³⁺Blue Phosphor

Cited by 16 publications

References 23 publications

Luminescent and Mechanical Properties of Cerium Doped Potassium Chloride Single Crystal

Luminescent and Mechanical Properties of Cerium Doped Potassium Chloride Single Crystal

Review—Mn⁴⁺-Activated Red and Deep Red-Emitting Phosphors

Probing the optical properties and luminescence mechanism of a UV‐emitting SrBPO₅:Ce³⁺ phosphor

Contact Info

Product

Resources

About

Effects of Ce Concentration and Temperature on Photoluminescence Intensity in KCl:Ce3+Blue Phosphor

Cited by 16 publications

References 23 publications

Luminescent and Mechanical Properties of Cerium Doped Potassium Chloride Single Crystal

Luminescent and Mechanical Properties of Cerium Doped Potassium Chloride Single Crystal

Review—Mn4+-Activated Red and Deep Red-Emitting Phosphors

Probing the optical properties and luminescence mechanism of a UV‐emitting SrBPO5:Ce3+ phosphor

Contact Info

Product

Resources

About

Effects of Ce Concentration and Temperature on Photoluminescence Intensity in KCl:Ce³⁺Blue Phosphor

Review—Mn⁴⁺-Activated Red and Deep Red-Emitting Phosphors

Probing the optical properties and luminescence mechanism of a UV‐emitting SrBPO₅:Ce³⁺ phosphor