The paper presents the results of studies photoluminescence (PL) LiB3O5:Ag glass at a temperature 12.6 K under influence synchrotron radiation λexc = 45 nm. It was found that obtained PL spectra consist three bands λmon 278, 336, and 379 Studies excitation by scanning with registration luminescent 280, 330, 390 nm revealed four for each λmon. is proposed main band 278 in associated centers based on Ag+ ions occupy Li+ sites structure, while other two 336 are Ag2+ Ag3+ conglomerates. B3+ – O–...

Abstract Realtime in situ temperature monitoring difficult experimental conditions or inaccessible environments is critical for many applications. Non-contact luminescence decay time thermometry often the method of choice such applications due to a favorable combination sensitivity, accuracy and robustness. In this work, we demonstrate feasibility an ultrafast PbI 2 scintillator determination, using structure X-ray radiation, produced by synchrotron. The kinetics scintillations was measured...

Low-temperature studies of the absorption, photoluminescence, photodiffusion and photoconductivity spectra Sn2P2S6 crystals were carried out in wide spectral range 0.8–3.5 eV. The position defect energy levels relative to crystal bands has been determined. It was shown that photoionization transitions from valence band level with Ev+1.35 eV are caused by presence hole metastable state. In optical photoelectric several revealed greater than gap (Eg = 2.5 eV). established these between upper...

The low-temperature photoluminescence (PL), photodiffusion current, photoconductivity (PC), and nuclear quadrupolar resonance spectra of the layered PbI2 single crystals Pb1−XCdXI2 alloys were investigated. It was shown that are formed for any composition ratio they have monopolar (hole) PC. exciton PL band energy depends linearly on ratio. found clusters with various sizes in alloys. For X≤0.50 large [more than Bohr radius (RB)] while X=0.50 both small (smaller RB). these within crystal...

It was shown that the photosensitivity region of semi-insulating V doped Hg0.018Cd0.981Mn0.001Te crystals extends up to 1800 nm and is caused by electron photogeneration resulting in transitions from main T41(F) state excited A42(F)- T41(P) states V2+ ions, which are resonance with conduction band. The electronic processes fast correspond nanosecond region. Codoping Mn atoms leads considerable improvement their optical quality increase resistivity. obtained results indicate such can be...

Abstract For the first time photo‐electromotive force (photo‐EMF) measurements were carried out for CdTe crystals doped with V atoms as a result of photogeneration carriers from deep impurity centers to conduction band. Tilted geometry was applied that allowed two‐dimensional monitoring vi‐ bration source. The CdTe:V excited by He–Ne laser wavelength 1.15 μm ( ħω = 1.08 eV) and P 2 mW. mechanism appearance holographic current in taking into account real defect structure proposed. frequency...

In this paper, the effect of Yb dopant on optical and photoelectric properties CsPbCl3:Yb single crystals is studied. The position main energy level Yb3+ ions relative to band was determined. Two channels electron photoionization into conduction were identified, which are photo-stimulated transition valence electrons from ground ion. crucial role Yb2+ in manifestation quantum cutting shown. A non-uniform distribution ytterbium crystal volume revealed. It established that absolute yield...

Nonlinear optical response of metal-semiconductor Zn0.8Co0.2O/Au nanocomposite films was studied experimentally and theoretically. Z-scan measurements revealed a positive nonlinear index refraction the composite film. Fluorescent spectroscopy exhibited narrow sharp peak that might be attributed to exciton semiconductor nanostructured thin film enhanced by nearby gold nanoparticles. Classical electrodynamic calculations quantum dot in close proximity nanoparticle agree well with observed...

The time-resolved photoelectric spectroscopy technique was used for the characterization of semi-insulating CdTe:V crystals using a short light pulse with 9 ns duration from nitrogen laser (337.1 nm). stationary monochromatic illumination let us measure photocurrent caused by detrapping electrons photogenerated excitation. dependence intensity on energy additional in photorefractive delay time td = 5 ns, which corresponds to its maximum value, investigated. spectral produced process measured...

We studied the dynamics of excitons excited in layered semiconductor PbI2 nanoclusters (NCLs) using time-resolved photoluminescence (TRPL) spectroscopy. TRPL spectra reveal formation self-trapped (STEs). It was shown that STEs for larger [more than Bohr radius exciton bulk (RB = 1.9 nm)] NCLs occurs sub-nanosecond time scale, while case small with sizes about RB, it takes place nanosecond scale. The effective energy transfer from to NCLs, which arises dipole-dipole intercluster interactions,...

The photorefractive characteristics of Ti-doped CdTe semi-insulating crystals were measured. Additional optical and photoelectric measurement confirmed that titanium has advantages over other dopants this material better for potential applications. high holographic gain coefficient, Γ≈0.60 cm−1, low background absorption, kb≈0.2 quality homogeneity, almost monopolar (electronic) photoconductivity show these materials can be effectively used both applications in the near infrared region....

In this paper, the experimental data on nonlinear refraction of silver nanoparticle composites using a standard Z-scan technique are presented. It was found that colloids nanoparticles various size possess defocusing ability. Based general considerations, one can conclude thermal lens nature colloids. Significantly different magnitudes refractive index suspended in water and glycerol be explained by differences specific heat capacity mentioned fluids. The effective thickness for...

Vanadium-doped semi-insulating Cd1−xHgxTe (x < 0.05) n-type crystals were grown by the Bridgman technique for first time. Studies carried out of low-temperature optical and photoelectric properties = 0.014), which provided information on deep anisotropic impurity centres intrinsic defects. The nature position their energy levels with respect to crystal band determined. It was shown that investigated there are two photogeneration mechanisms electrons from levels: auto-ionization discrete...

The nature and the energy structure of impurity intrinsic defects, including formation anisotropic centres, are determined in V-doped semi-insulating Cd1−xHgxTe (x ⩽ 0.037) crystals which were grown by Bridgman technique for first time. From detailed analysis spectral dependence photodiffusion current data obtained different directions light propagation as well absorption spectra, we established that investigated V2+ V3+ centres formed. Two mechanisms electron photogeneration from ground...

The studies of the optical and photoelectric properties Cd_1-xHg_xTe:V (x&le;0.02, <i>N</i>_v = 10¹⁹ cm^-3) were carried out. investigated semiinsulating (&rho; 10⁸ - 10⁹ &Omega;xcm) crystals grwn by vertical Bridgman technique. All obtained samples had n-type conductivity. measurements absorption, photoluminescence photodiffusion spectra allowed us to obtain information about impurity centers intrinsic defects. nature...

The formation of metallic (silver) nanoparticles (AgNPs) in the near-surface layer 97.0Li2B4O7–1.0Gd2O3–2.0Ag2O (Li2B4O7:Gd,Ag)glass at annealing vacuum or air has been reported. "bottom-up"mechanism nanoparticle is suggested. A conclusion drawn that does not necessarily require presence reducing ions, whereas impossible without agents. Structural defects play a crucial role AgNPs nucleation process. intense plasmon absorption bands peaked 400.4, 564.2, and 413.7 nm are observed spectra...

Results of investigations 98.0Li2B4O7-2.0Ag2O and 97.0Li2B4O7-2.0Ag2O-1.0Gd2O3 glasses with Ag nanoparticles (Ag NPs), formed by thermal treatment in vacuum air, are presented. Intensive plasmon absorption bands, connected NPs, were observed their optical transmission spectra. It is ascertained that volumes both there a small number whereas main mass concentrated near the surface samples. The mechanism NPs formation proposed. A conclusion drawn annealing does not necessarily require presence...

A new family of semiconducting heterostructured transition-metal dichalcogenides (TMDCs) with incommensurate (“misfit”) spatial arrangements has been prepared from structurally dissimilar 2H-MoS₂ and 1T-HfS₂ upon mechanical processing annealing.

Sorption-luminescent methods for ytterbium and morin determination based on the clinoptilolite were proposed. Optimal luminescent material preparation condition is sorption of Yb(III) precalcined at 50 °C in solution with pH 8.0. The obtained clinoptilolite-Yb(III) sample was treated solution. Definable range concentration detection limit 0.1 μg·mL−1 within 0.25–1.0 μg·mL−1. proposed method can be used presence many rare earths. concentrations 3·× 10−4 − 4·× 10−3 mol·L−1. 1.5·×·10−4