| Abstract [eng] |
New generation, thermally activated delayed fluorescence based light emitting diodes have big interest in scientific community. Compared to previous, metal complex or just singlet fluorescence emitting organic light diodes, TADF based devices have good electroluminescence properties, are cheap ant safer to the environment. These materials in emissive layer are used as emitters or as hosts. Because of TADF diodes great potential in market, various scientific groups seek to discover more thermally stable, deeper color and better electroluminescence properties having materials. Big attention allocated to cheap and effective blue and white color emitting device production. In this work, it is described synthesis of substituted carbazole donors having diphenylsulphone or benzophenone materials. Characteristics of the materials were approved by thermos-gravimetric analysis, differential scanning calorimetry, nuclear magnetic resonance, mass spectrometry and optical methods. The materials were used in emissive layer as host in multilayer OLED devices. Best electroluminescence properties had device, which emissive layer consisted of bis[4-{3-(4-carbazol-9-ylphenyl)carbazol-9-yl}phenyl]sulphone host with commercial 4CzIPN emitter. Device with dispersed 12,5 % of 4CzIPN emitted green colour light, OLED turn-on voltage was 5,2 V, maximal power, current and external quantum efficiencies respectively were 39,9 lm/W, 44,7 cd/A and 14,1 %. Maximum luminance of the device was 16220 cd/m2. |
