Interband phototransitions in AgBr nanocrystals assisted by free carriers

Иванов, А. В.; Levitskii, R. S.; Perlin, E. Yu.; Staselko, D. I.

doi:10.1134/s0030400x07110161

Cited by 3 publications

(3 citation statements)

References 4 publications

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“…Rather simple calculations yield the following expression for the contribution of the first diagram to the process amplitude: (14) The contribution of the second diagram has the form (15) Analysis of the expressions in the right-hand side of (14) and (15), including numerical calculations, shows that the dependence of the result obtained on the angle between vectors q and k c and q and k v is insignificant and can be neglected. In this case, one can easily derive explicit expressions for the integrals obtained as a result of standard transition from summation over q to integration.…”

Section: Wave Functions Of Impurity Statesmentioning

confidence: 99%

“…In this study, we took into account (within a similar model) processes with simultaneous participation of two impurities. In principle, processes of this type may lead to an avalanche-like increase in the generation rate of nonequilibrium EHPs and to switching of material between states with different optical and electrical properties [11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26].…”

Section: Introductionmentioning

confidence: 99%

“…Nonlinear optical phenomena, in which processes with simultaneous absorption of one or several photons and energy transfer between electrons interacting according to the Coulomb law play a key role, were investigated for the first time in [11,12], where threephoton interband transitions with participation of free electrons in n-InAs were considered (see also [13,14]). Processes of this kind lead also to such phenomena as photon avalanche [15][16][17][18][19][20][21], multiphoton avalanche [22][23][24][25], or the so-called "optical trampoline" [26].…”

Section: Introductionmentioning

confidence: 99%

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Nonlinear optical absorption in crystals with deep impurities: I. Probabilities of two-center phototransitions between band and impurity states

Perlin¹,

Levitskii²,

Иванов³

et al. 2015

Opt. Spectrosc.

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A new model of photogeneration of nonequilibrium electron-hole pairs in crystal with deep impurities is proposed. The probabilities of two-center transitions between band and impurity states with simultaneous absorption of photon and energy transfer between electrons interacting in accordance with the Coulomb law are calculated within the second-order perturbation theory. The two-band zero-range potential model is used to describe deep-impurity states.

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Section: Wave Functions Of Impurity Statesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Nonlinear optical absorption in crystals with deep impurities: I. Probabilities of two-center phototransitions between band and impurity states

Perlin¹,

Levitskii²,

Иванов³

et al. 2015

Opt. Spectrosc.

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Physical and chemical problems of the creation of photostable converters of light energy on the basis of dyed polymers

Ishchenko

Grabchuk

2009

Theor Exp Chem

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The main factors affecting the degradation of dyed polymeric matrices by the action of light (conversion of light energy into thermal energy, electron phototransfer, population of triplets, aggregation of dyes, oxidation-reduction processes, interaction with oxygen, including singlet) are analyzed and classified. Their dependence on the structure of the dyes, the nature of the polymer, and the method of dyeing of the latter is examined. Criteria for the creation of lightfast dyed matrices are formulated. Special attention is directed to contemporary light-sensitive materials in which the dye is covalently bonded to the polymer and to organic-inorganic compositions based on them.Dyed polymers are widely used in laser technology [1][2][3][4][5], media for writing and recording data [6-8], solar power [9][10][11][12], and optoelectronics [12][13][14][15]. Such polymeric materials have a series of operational advantages over dyed liquid materials on account of their more simple and more convenient construction, non-toxicity, and the possibility of working over a wide temperature range (from minus to plus temperatures) and under conditions of weightlessness. However, these advantages can only be realized to the full extent in the solution of various applied problems if dyed matrices with sufficient stability to the action of light are created. The aim of the present review was therefore to analyze, classify, and generalize methods of creating such matrices. FACTORS GIVING RISE TO THE DEGRADATION OF DYED POLYMERS DURING THE ACTION OF LIGHTThe presence of absorbing microimpurities that are heated by radiation are responsible for the radiation damage of optically transparent polymers. Purification from such inclusions at the monomer stage leads to a substantial increase in the threshold of radiation damage in the obtained polymer. For instance, the purification of methylmethacrylate (MMA) by repeated slow distillation raises this threshold of polymethylmethacrylate (PMMA) from several times [16] to two orders of magnitude [17]. 0040-5760/09/4503-0143

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Multiphoton intraband absorption of femtosecond light pulses in crystals: I. General relations

2017

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Interband phototransitions in AgBr nanocrystals assisted by free carriers

Cited by 3 publications

References 4 publications

Nonlinear optical absorption in crystals with deep impurities: I. Probabilities of two-center phototransitions between band and impurity states

Nonlinear optical absorption in crystals with deep impurities: I. Probabilities of two-center phototransitions between band and impurity states

Physical and chemical problems of the creation of photostable converters of light energy on the basis of dyed polymers

Multiphoton intraband absorption of femtosecond light pulses in crystals: I. General relations

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