Decay Kinetics and Polarization of the AT Emission of Pb2+ Centres of Different Structure in KBr:PbBr2

Two infrared emission regions (with maxima at 0.803 and 0.723 eV) recently observed by Harami et al. in X-irradiated K I : PbI, and the emission regions with maxima at 2.01, 1.79, and near 1.2 eV are studied. The observed emission bands are connected with H,(Pb2+j centres (Pb2+ ions associated to molecular ions on anionic (a) and cationic (c) sites). The infrared emission bands of these centres are due to processes occuring in the excited state of the molecular ion perturbed by the P b Z + ion. The emission bands are connected with electronic transitions from the tetragonal (2.01 and 1.79 eV peaks) and trigonal (region around 1.2 eV) minima of the triplet relaxed excited state of the P b Z + ions perturbed by the ion which can occupy two different positions with respect to P b Z + . The emission band with maximum at 2.05 eV and the region near 1.2 eV are associated to similar transitions in the Pb2+ ion perturbed by the [131aFa (V,,(PbZ+) centres) molecular ion. On the basis of these results the optical properties of V, centres (at 0.805 and 0.734 eVj, previously observed by Harami et al. in halogen-excess K1 crystals, and assumed here to be the [lilac molecular ions, are also discussed. nOKa3aH0, YTO nBe IIOJIOCbl HH@paKpaCHOro H3JIyYeHHR (C MaKCHMYMaMH IIPH 0,803 H 0,723 CV), HenaBHO 06HapyXeHHbIe XapaMH C COTPYAHKKaMH B 06JIYYeHHbIX PeHTreHOBCKHMM JIyYaMM KpHCTan-JIaX KI PbI,, H IIOJIOCbI H3nyYeHKR C MaKCHMyMaMH IIpH 2,01, 1,79, B OK0,lO 1,2 e v , HCCJIe-nOBaHHble B HaCTORWefi pa6OTe. 06yCJIOBJIeHbI Hz(PbZ +)-UeHTpaMH (aCCOUHaTaMK KOHOB PbZ + C MOJIeKYJXPHbIMH HOHaMH 3aHHMaH)WKMH aHHOHHblfi (a) 11 KaTHOHHblfi (C) y33bI). MH-@paKpaCHOe H3JIYYeHHe 3THX UeHTpOB CBR3blBaeB.rCR C npOUeCCaMM, IIpOHCXO.4RIUBMH B B036YXUKHHOM COCTOXHHH MOJIeKynRpHOrO HOHa B~nHMoe H3JIyYeHHe HX CBRSbIBaeTCR C 3JIeKTPOHHbIMM IIepeXOflaMH H 3 TeTparOHaJIbHbIX (nOJIOCbl 2.01 H 1,79 e v ) H TPHrO-HanbHblX (IIOJIOCbl OKOJIO 1.2 e v ) MHHHMYMOB TpHIIJIeTHOrO peJIaKCHpOBaHHOJ0 B036YXneHHOTO COCTORHHR HOHa Pb2+, B03MYLUeHHOTO HOHOM [I,],,, KOTOPblk MOXeT 3aHHMaTb nBe pa3JIHYHbIe I I 0 3 H I p f H IIO OTHOUIeHHIO K Pb2+. n O J I O C b 1 H3JIyqeHHR C MaKCHMYMaMH IIpH 2,05 eV A B O~J I~C T H OKOJIO 1.2 eV IIpHIlHCbIBaKlTCR aHaJlOrHYHbIM IlepeXOnaM B HOHaX P b 2 + , B03MYUleHHblX MOJe-KynRpHblM HOHOM [1,],,, (VzZ(PbZ +) UeHTpaX). O 6 c y~n a e~c a IIpHpOfla Ha6~7IOfl2IBItIefiCR PaHee Xapa-MI1 C COTPYAHHKaMH HH@PaKpaCHOfi JIIoMHHeCIIeHUHH (0,805 H 0,734 e v ) T.H. VL-UCHTPOB, OnTHYeCKM CO3AaBaeMbIX B KpHCTannaX KI, anLIHTHBHO OKpaLLIeHHbIX B IIapaX fiona. BO3MyLUeHHOrO HOHOM Pb2 +. l ) U1.

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Luminescent Associates of Pb²⁺v_c⁻ Dipoles with Interstitial Iodine Atoms in KI:PbI₂ Crystals

Egemberdiev

Ismailov

Usarov

et al. 1991

Physica Status Solidi (b)

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Luminescence of Lead Ions Associated with Interstitials and Vacancies in Alkali Halides

Egemberdiev

Usarov

Zazubovich

1991

Physica Status Solidi (b)

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Several types of luminescent associates of lead ions (Pb2+, Pb+) with interstitial halide ions (X−i) as well as with cation (v−c) and anion (v+a) vacancies are observed in alkali halides X‐irradiated at 80 or 295 K. Optical properties and a detailed structure of these associates, the processes of their creation and destruction as well as their optically or thermally stimulated transformations are studied. The associates investigated form the three following groups each containing several types of centres: (1) centres on the basis of a PbX 2−‐molecular ion; (2) centres on the basis of a Pb2+X 2− dipole; and (3) centres of the laser‐active structure on the basis of a Pb+X−v+a associate. The optical characteristics of the various centres of each group are shown to be similar. It is concluded that they are determined by electronic transitions between the energy states of the basis associate (PbX 2−, Pb2+X i−, or Pb+X−v+a), and that the influence of some other defects (v c−, X i−, X3, etc.) may be considered as a small perturbation.

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Triplet relaxed excited state structure and luminescence of thallium‐doped alkali halides

Nagirnyi

Soovik

Vaino

et al. 1991

Physica Status Solidi (b)

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For the first time a slow component is observed and studied in the decay kinetics of A, emission of TI+ centres in KBr, KI, RbCI, and RbI crystals. The existence is established of a singlet metastable level below the doublet emitting one in each Jahn-Teller minimum of the triplet excited state of the T1' centres. It is concluded that for all ns2 ions in alkali halides the structure of the relaxed excited state is qualitatively the same, and it may adequately be described in terms of a theory that considers the Jahn-Teller effect as a main interaction in the relaxed excited states of the luminescence centres. The nature is discussed of the weak emission bands appearing on excitation in the A absorption band of TI' centres besides the main AT and A, emission bands, earlier interpreted as hot luminescence of TI' centres.BIIepBbIe 06HapyXeH A HCCJIeAOBaH MeAJIeHHbIg KOMnOHeHT 3aTyxaHAR A , -~s n y q e~~a TI+ -1IeHTPOB B IcpRcTannax KBr, KI, RbCl M RbI. YCTaHOBJIeHO CYLUeCTBOBaHHe CHHrJIeTHOrO MeTaCTa6HJIbHOTO YPOBHR IIOA Ay6neTHbIM R3JIyYaTeJIbHbIM YPOBHeM B KaXDOM RH-TeJIJIepOBCKOM MRHMMYMe TpH-nJIeTHOr0 B036YXneHHOTO COCTORHAR Tl+-UeHTpOB. CDeJIaH BbIBOg 0 TOM, 'IT0 aJIR

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Decay Kinetics and Polarization of the A_T Emission of Pb²⁺ Centres of Different Structure in KBr:PbBr₂

Cited by 13 publications

References 13 publications

Luminescent Associates of Pb²⁺v_c⁻ Dipoles with Interstitial Iodine Atoms in KI:PbI₂ Crystals

Luminescent Associates of Pb²⁺v_c⁻ Dipoles with Interstitial Iodine Atoms in KI:PbI₂ Crystals

Luminescence of Lead Ions Associated with Interstitials and Vacancies in Alkali Halides

Triplet relaxed excited state structure and luminescence of thallium‐doped alkali halides

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Decay Kinetics and Polarization of the AT Emission of Pb2+ Centres of Different Structure in KBr:PbBr2

Cited by 13 publications

References 13 publications

Luminescent Associates of Pb2+vc− Dipoles with Interstitial Iodine Atoms in KI:PbI2 Crystals

Luminescent Associates of Pb2+vc− Dipoles with Interstitial Iodine Atoms in KI:PbI2 Crystals

Luminescence of Lead Ions Associated with Interstitials and Vacancies in Alkali Halides

Triplet relaxed excited state structure and luminescence of thallium‐doped alkali halides

Contact Info

Product

Resources

About

Decay Kinetics and Polarization of the A_T Emission of Pb²⁺ Centres of Different Structure in KBr:PbBr₂

Luminescent Associates of Pb²⁺v_c⁻ Dipoles with Interstitial Iodine Atoms in KI:PbI₂ Crystals

Luminescent Associates of Pb²⁺v_c⁻ Dipoles with Interstitial Iodine Atoms in KI:PbI₂ Crystals