Optical spectra and electronic structures of lead halides

Fujita, Masami; Itoh, Minoru; Bokumoto, Y; Nakagawa, Hideyuki; Alov, D.L.; Kitaura, Mamoru

doi:10.1103/physrevb.61.15731

Cited by 50 publications

(43 citation statements)

References 32 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The physical properties of lead halides PbX 2 (X ¼ Cl, Br, I) have been extensively studied for many years with an increasing interest in their luminescent properties [1,2], and their possible applications in acousto-optical devices [3] and as radiation detectors [4]. For these reasons much attention has been paid to the growth of lead halide crystals.…”

Section: Introductionmentioning

confidence: 99%

Thermomechanical Measurements of Lead Halide Single Crystals

Nitsch

Rodová

2002

phys. stat. sol. (b)

View full text Add to dashboard Cite

PACS: 65.40.De; 64.70.Kb The linear thermal expansion of lead halide (PbCl 2 , PbBr 2 , PbI 2 ) crystals was measured between room temperature and their melting points. Using the temperature dependence of linear thermal expansion Dl/l, the coefficients of linear thermal expansion a and their temperature dependencies were calculated and the results presented. The thermal expansion of compounds such as CuCl, CsPbCl 3 , CsPbBr 3 and RbPbCl 3 was also measured and the changes in a were used in the study of polymorphism in lead halides.

show abstract

Section: Introductionmentioning

confidence: 99%

Thermomechanical Measurements of Lead Halide Single Crystals

Nitsch

Rodová

2002

phys. stat. sol. (b)

View full text Add to dashboard Cite

show abstract

“…Excitons in PbBr 2 crystals, which belong to the same crystallographic group 20 with PbCl 2 and have similar electronic-band structures, 12,21,22,23 undergo uncommon relaxation; 24 they spontaneously dissociate and relax into spatially-separated STEL's and STH's. The recent ESR study 11 supports the relaxed state of excitons structurally.…”

Section: Introductionmentioning

confidence: 99%

“…12). According to the cluster calculation 12 for PbCl 2 , the top of the valence band is composed of about half-and-half Pb 2+ (6s) and Cl − (3p). Therefore, the structure of localized hole centers in PbCl 2 is significant to clarify the relation of hole-relaxation dynamics with the electronic-band structure in PbCl 2 and to un-derstand the relation in lead halides comprehensively.…”

Section: Introductionmentioning

confidence: 99%

Self-trapped states and related luminescence inPbCl2crystals

et al. 2002

View full text Add to dashboard Cite

We have comprehensively investigated localized states of photoinduced electron-hole pairs with electron-spin-resonance technique and photoluminescence (PL) in a wide temperature range of 5-200 K. At low temperatures below 70 K, holes localize on Pb 2+ ions and form self-trapping hole centers of Pb 3+ . The holes transfer to other trapping centers above 70 K. On the other hand, electrons localize on two Pb 2+ ions at higher than 50 K and form self-trapping electron centers of Pb2 3+ . From the thermal stability of the localized states and PL, we clarify that blue-green PL band at 2.50 eV is closely related to the self-trapped holes.

show abstract

“…Polycrystalline PbF 2 (Alfa Aesar, >99% purity) was examined by x-ray diffraction at ambient conditions and indexed as the orthorhombic cotunnite-type phase with the unit cell a = 6.4472 (3) Å, b = 3.9019(2) Å, c = 7.6514(3) Å and V = 192.48(1) Å 3 . The sample was ground to micronsized grains and mixed with 10-15 wt.% platinum which was used as a pressure calibrant and laser absorber.…”

Section: A High-pressure Experimentsmentioning

confidence: 99%

High-pressure polymorphism ofPbF2to 75 GPa

et al. 2016

View full text Add to dashboard Cite

Lead fluoride, PbF 2 , was investigated experimentally in the laser-heated diamond anvil cell by x-ray diffraction to pressures of 75 GPa at room temperature and to 64.5 GPa and 2430 K, as well as through first-principles density functional theory calculations up to 70 GPa. During room temperature compression, no discontinuous changes in the x-ray diffraction pattern or volume were observed, but the lattice parameters display highly anomalous trends between 10-22 GPa with enhanced compressibility along the a direction and reduced or even negative compressibility along b and c. Theoretical calculations of valence electron densities at 22 GPa show that α-PbF 2 has undergone a pressure-induced isosymmetric phase transition to a postcotunnite Co 2 Si-type structure and also reveal the detailed atomic rearrangements associated with the development of an extra Pb-F bond in the high-pressure phase. Our x-ray results and theoretical calculations are consistent with an isosymmetric phase transition occurring over 10- Upon heating above 1200 K at pressures at or above 25.9 GPa, PbF 2 partially transforms to the hexagonal Ni 2 In-type phase but wholly or partially reverts back to Co 2 Si-type phase upon temperature quench. From 43-65 GPa, nearly complete transformation to the Ni 2 In-type PbF 2 is observed at high temperature, but the material partially transforms back to the orthorhombic phase upon temperature quench. Our results show that high-pressure behavior of PbF 2 is distinct from that of the alkaline earth fluorides with similar ionic radii. Our results also have relevance to understanding the behavior of lanthanide and actinide dioxides, which have been predicted theoretically to exhibit similar isosymmetric transitions at Mbar pressures.

show abstract

Optical spectra and electronic structures of lead halides

Cited by 50 publications

References 32 publications

Thermomechanical Measurements of Lead Halide Single Crystals

Thermomechanical Measurements of Lead Halide Single Crystals

Self-trapped states and related luminescence inPbCl2crystals

High-pressure polymorphism ofPbF2to 75 GPa

Contact Info

Product

Resources

About