Schematic energy level diagram for OLED devices. The alignment of energy levels within an OLED device is paramount for high efficiency performance. In this study, the emissive, electron...

Jun 18, 2020 · We have demonstrated here the use of state-of-art simulation approaches to investigate the effect of molecular orbital energy levels on the recombination of excitons in OLED devices.

White organic light-emitting diodes (OLEDs) are ultra-thin, large-area light sources made from organic semiconductor materials. Over the last decades, much research has been spent on finding the...

Aug 14, 2020 · Schematic energy level diagrams illustrating the role of an electron blocking layer (EBL) in an OLED. The phosphorescent dopant HOMO and LUMO levels are shown as dashed lines in the EL (=EML), and excitons emitting light are indicated as starburst shapes.

Generally, OLED light-emitting materials can be divided into two main types according to their chemical and photophysical properties: small molecule light-emitting materials and polymeric light...

Energy level diagram of a single-layer OLED, where the organic material is depicted as a fully depleted semiconductor. The valence band Ey corresponds to the HOMO and the conduction band Ec corresponds to the LUMO.

Top Emission Adaptive Current Drive technology, allows OLEDs to be larger and higher in brightness and resolution. A 13-inch full-color AMOLED using poly-Si TFT was made where the light emits through the transparent cathode and thus, the filling factor does not depend on …

Energy level diagram of OLED • Electrons injected from the cathode (Ca, Al, Ba, etc.) • Holes injected from the anode (Indium/tin oxide, PANi, PEDOT) • Transport and radiative recombination of electron hole pairs at the emissive polymer

As the energy of the π-level is known from UPS and the REELS data gives the energy gap from this level to the π* levels, the energy level diagram (or electronic structure) of PFO can be created. With this diagram, it is then straightforward to calculate a band gap of 3.3 eV for PFO which agrees with the published value.1

The electronic criteria in a given OLED material include charge transport type, charge mobility, boundary orbital energies, and the triplet exciton energy. Figure 1 shows a schematic of a typical OLED energy diagram that sets the requirements for the position of the boundary orbital energy levels in each type of layer forming the device.