Methods for Properties Analysis of Crystalline Materials Based on Solid Solutions of Silver and Thallium (I) Halides

The paper presents a set of methods developed for properties control of new optical crystals based on solid solutions of silver and thallium (I) halides. Crystals and optical products based on them are used for optical and optoelectronic systems in the middle and far infrared range. In this regard, to analyze the properties of new infrared materials, new analysis methods are required, which provide high accuracy and repeatability of the results. The authors have developed methods for studying the optical, mechanical and electrical properties of materials. The studies’ results carried out by these methods for various systems of silver and thallium (I) halides solid solutions are presented.

Achieving the potential multifunctional near-infrared materials Ca3In2−xGaxGe3O12:Cr3+ using a solid state method

Near-infrared spectroscopy is developing rapidly in the fields of human detection and food analysis due to its fast response and non-invasive characteristics.

JUSTIFICATION OF REQUIREMENTS FOR INFRARED RANGE LENSES STATIONED AT AIRCRAFT

The article discusses the requirements for the lens of thermal imaging devices, and formulates special requirements for their placement on aircraft. Thermooptic aberrations of a single lens made of various infrared materials are analyzed. The values of the thermooptic constant for some materials are given. A condition for eliminating thermal refocusing for a single lens is given.

Designing a super broadband near infrared material Mg3Y2Ge3O12:Cr3+ using cation inversion for future light sources

A series of broad emission band near infrared materials Mg3Y2Ge3O12:Cr3+ (650–1200 nm) was prepared based on cation inversion.

Kinetically Controlled Self-Assembly of Phthalocyanine–Peptide Conjugate Nanofibrils Enabling Superlarge Redshifted Absorption

Supramolecular assembly could in principle lead to redshifted absorption through J-aggregation of chromophores, which would be a highly promising method for achieving near-infrared materials with improved functionality and flexibility. To effectively enhance the material functionalities, one of the great challenges remaining is to achieve an aggregation state with a redshift larger than 100 nm. Conventional assemblies that are mostly thermodynamically controlled have a limited redshifted absorption of less than 30 nm. In this work, using a model phthalocyanine–peptide conjugate compound, we achieved the first fabrication of phthalocyanine-based near-infrared materials with a superlarge absorption redshift of 105 nm by a kinetically controlled self-assembly strategy. In this kinetically controlled self-assembly process, sufficient rearrangement of intermolecular aggregates to an ordered structure is revealed to be crucial to facilitate the formation of nanofibrils instead of nanoparticles, which are formed via a general rapid self-assembly pathway under thermodynamic control. The superlarge redshift in the absorbance of assembled nanofibrils originates from the orderly stacked phthalocyanine chromophores, which enable a charge transfer state through more effective intermolecular orbital overlapping. The kinetically controlled J-aggregation state of the phthalocyanine–peptide conjugate with superlarge redshifted absorption not only opens an unprecedented route toward novel near-infrared phthalocyanine materials but also holds great promise for revealing general design principles for various organic dye materials.