Precise adaptation of the greenhouse lighting spectrum to basic photophysiological processes can effectively and directionally stimulate plant growth and development. The optimal spectrum depends on the plant species and the stage of development and could be assessed empirically. The aim of this study is to determine the LED illumination spectrum that provides a significant improvement in the growth rate and accumulation of biologically active compounds for basil plants (Ocimum basilicum L.) under hydroponic cultivation compared to more traditional lighting sources. The following light sources with various emission spectra were used: an LED lamp within a spectral range of 400–800 nm (B:G:R 15%:5%:80%); a high-pressure sodium lamp (HPS) (B:G:R 5%:45%:50%); a compact fluorescent lamp (B:G:R 20%:40%:40%); a grow LED strip (B:G:R 15%:40%:45%); a white LED lamp (B:G:R 30%:45%:25%); a customized LED lighting setup in color ratios 100%B, 75%B + 25%R, 50%B + 50%R, 25%B + 75%R, 100%R, and natural lighting. A photosynthetic photon flux density (PPFD) of 150 μmol∙m⁻²∙s⁻¹ was provided with all the sources. It was demonstrated reliably that employing the LED strip as an illumination device gives a 112% increase in basil plant yield compared to the HPS; the transpiration coefficient for the LED strip is six times lower than for the HPS. The content of flavonoids in the basil aerial parts on the 30th, 50th, and 70th days of development is 3.2 times higher than for the HPS; the metabolite composition is also more uniform for LED strip lighting.

Triple-cation perovskite solar cells, such as Cs_0.05(FA_0.83MA_0.17)_0.95Pb(I_0.83Br_0.17)₃ (hereinafter referred to as CsFAMA) have high efficiency (>26%), but their stability is limited by phase segregation and defects at grain boundaries. In this work, the effect of formic acid (HCOOH) on suppressing the degradation of perovskite films is investigated. It is shown that the addition of HCOOH to the precursor solution reduces the size of colloidal particles by 90%, which contributes to the formation of highly homogeneous films with a photoluminescence intensity deviation of ≤3%. Structural analysis and dynamic light scattering measurements confirmed that HCOOH suppresses iodide oxidation and cation deprotonation, reducing the defect density. Aging tests (ISOS-D) demonstrated an increase in the T80 lifetime (time to 80% efficiency decline) from 158 to 320 days for the modified cells under ambient conditions at room temperature and 40% relative humidity. The obtained results indicate a key role of HCOOH in stabilizing CsFAMA perovskite by controlling colloidal dynamics and defect passivation, which opens up prospects for the creation of commercially viable PSCs.

In this work, CsPbBr₃ perovskite quantum dots (QDs) were synthesised by hot injection, with reaction time controlling nanocrystal size and emission from 493 to 515 nm. Temperature-dependent photoluminescence (23–80 °C) showed decreasing intensity but stable peak position. Embedding QDs in PMMA and PVK revealed polymer-dependent thermal behaviour: insulating PMMA preserved radiative recombination and gave stable, reproducible quenching, while semiconducting PVK introduced interfacial charge transfer, enhancing thermal sensitivity. The results establish CsPbBr₃ QD–polymer composites as tunable temperature-sensitive platforms for optical sensing.

The process of creating a photosensitive structure with a double-distributed heterojunction based on a combination of fullerene and non-fullerene acceptors (PC71BM and ITIC-F) is described in this work. P3HT was used as the donor in both layers. The spectral photosensitivity response of the resulting FTO/P3HT:ITIC-F/P3HT:PC71BM/InGaSn structure covers a wide range of 470–980 nm. The peak photosensitivity of the structure reaches 40.98 mA/W, which is many times higher than the values for structures based on individual layers and a blend of all materials in one bulk heterojunction. The studies and measurements show that such a structure can be used in optics and electronics to detect radiation in the visible and near-IR ranges. In addition, the principle of creating a double-distributed heterojunction structure used in this study can be applied to other organic materials to obtain previously unattainable performance levels.

В связи с необходимостью повышения урожайности растений и снижения энергопотребления источников излучения, мы вводим концепцию циклоадаптивного фоторежима (ЦАФР), который адаптируется к подстадиям (этапам) развития растений, динамически изменяет параметры освещения для оптимизации их роста и развития и способствует увеличению синтеза фотосинтетических пигментов. По результатам оценки влияния спектрального состава светодиодных устройств на развитие Lactuca sativa L. было определено, что светоизлучающее устройство, основанное на автоматизированном изменении спектрального состава излучения и плотности фотосинтетического фотонного потока в зависимости от этапа развития растения в соответствии с циклоадаптивной методикой освещения, приводит к увеличению урожайности культуры Lactuca sativa L. в 2 раза, а также снижению количества использованной воды, необходимой для образования 1 г сухого вещества, в 2,5 раза по сравнению с естественным освещением.