Crystalline organic thin films for crystalline OLEDs (I): orientation of phenanthroimidazole derivatives

Abstract

Compared to traditional organic light-emitting diodes (OLEDs) based on amorphous thin films, crystalline OLEDs possess promising advantages in developing advanced display technologies, such as longer life time and lower driving...

High-efficiency blue-emission crystalline organic light-emitting diodes sensitized by “hot exciton” fluorescent nanoaggregates

“…2E and fig. S3A, respectively, indicating their crystallinity nature, and are consistent with the previous report ( 24 , 30 , 31 ). The grazing incident wide-angle x-ray diffraction (GIWAXD) can be carried out to investigate the crystal structure ( 18 ).…”

“…The grazing incident wide-angle x-ray diffraction (GIWAXD) can be carried out to investigate the crystal structure ( 18 ). Figure S3B shows the GIWAXD images of 2FPPICz crystalline thin film with annotated ( hkl ) parameters according to ( 31 ), indicating that 2FPPICz CHM is composed of polycrystal with well-crystallinity nature. The out-of-plane XRD patterns of BP1T (6 nm)/2FPPICz (5 nm)/CHM-HENA-D (20 nm) are consistent with BP1T (6 nm)/2FPPICz (25 nm), and no other diffraction peak appears ( Fig.…”

An Efficient Blue‐Emission Crystalline Thin‐Film OLED Sensitized by “Hot Exciton” Fluorescent Dopant

“…It has been confirmed that the weak epitaxy growth (WEG) of 2FPPICz crystalline thin films can be applied on surfaces of smooth amorphous substrates, and their crystal structures are consistent for either PEDOT: PSS or Si/SiO 2 substrate. [ 15 , 39 , 40 ] Thus, the crystalline thin films were prepared on Si/SiO 2 substrate by WEG method, [ 41 , 42 ] to facilitate the analysis and investigation on the crystalline EML morphologies. More than two monolayers BP1T (less than three layers) were first deposited on the Si/SiO 2 substrate to form a continuous crystalline thin film at substrate temperature 102 °C, acting as an inducing layer for the subsequent epitaxy growth of crystalline thin films.…”

“…The BP1T and 2FPPICz crystal structures have been studied in the previous reports. [ 14 , 15 , 40 ] (002), (004), and (006) planes of BP1T crystalline thin film and (‐202) plane of 2FPPICz crystalline thin film have been marked at their corresponding peaks, respectively. The XRD patterns of BP1T/2FPPICz/CHM‐HES‐D are consistent with BP1T/2FPPICz and no new diffraction peak appears.…”

Highly stable deep red-to-NIR OLEDs with an external quantum efficiency of 4.9% from room temperature nanostructured columnar fluids based on hetero atom bay-annulated perylene bisimides

“…The increase in concentration may also alter the crystallinity and the thin film morphology of composite materials. [80][81][82][83][84] Furthermore, higher doping concentrations of emitters may lead to nonradiative decay of excitons due to the Auger recombination. 85,86 We have also observed the effects of doping concentration on EL spectra of these devices.…”