Principles of phosphorescent organic light emitting devices

Abstract

Organic light-emitting device (OLED) technology has found numerous applications in the development of solid state lighting, flat panel displays and flexible screens. These applications are already commercialized in mobile phones and TV sets. White OLEDs are of especial importance for lighting; they now use multilayer combinations of organic and elementoorganic dyes which emit various colors in the red, green and blue parts of the visible spectrum. At the same time the stability of phosphorescent blue emitters is still a major challenge for OLED applications. In this review we highlight the basic principles and the main mechanisms behind phosphorescent light emission of various classes of photofunctional OLED materials, like organic polymers and oligomers, electron and hole transport molecules, elementoorganic complexes with heavy metal central ions, and clarify connections between the main features of electronic structure and the photo-physical properties of the phosphorescent OLED materials.

Thermally Activated Delayed Fluorescence Emitters for Deep Blue Organic Light Emitting Diodes: A Review of Recent Advances

“…During the past two (plus) decades, organic light-emitting diodes (OLEDs) have been extensively studied as potential devices for full-color flat-panel displays and lighting sources [1][2][3][4][5]. OLEDs have attracted a great deal of interest and possess the potential to replace the traditional inorganic technology.…”

Chemical Tuning and Absorption Properties of Iridium Photosensitizers for Photocatalytic Applications

“…It should be noted that the nature of the lowest-lying triplet states is of primary importance for light-emitting devices and photocatalytic reactions. However, the main focus in this communication is put on the absorption properties, where the properties of singlet states are of primary interest [40][41][42].…”

“…However, the intensities of the spin-forbidden singlet-triplet transitions were not calculated, although Ir has large spin-orbit coupling constant. Recently, it was shown that singlet/triplet mixing in similar Ir photosensitizers has only a minor impact on the absorption spectra and results in small red shifts of the bands in the visible range and a decrease of intensities as triplet states possess small oscillator strengths [40][41][42]. As we have not aimed at fitting spectral widths for various PSs and transitions of different nature, a Gaussian broadening with a universal parameter (0.25 eV) has been applied to all stick-spectra.…”

Электронное Строение И Спектры Трифениламинов, Функционализированных Фенилэтинильными Группами

“…ды) [4,12,13]. Сочетание квантово-химических методов исследования с данными ИК и электронной спектро-скопии позволило нам проанализировать поведение мо-лекул трифениламинов в возбужденном состоянии, а также соотнести наблюдаемые ИК полосы поглощения с конкретными типами колебаний, что является важным инструментом для анализа электронно-колебательных спектров изучаемых соединений.…”