A Novel trans‐1‐(9‐Anthryl)‐2‐phenylethene Derivative Containing a Phenanthroimidazole Unit for Application in Organic Light‐Emitting Diodes

Abstract

Aryl-substitutedp henanthroimidazoles( PIs) have attracted tremendousa ttention in the field of organic lightemitting diodes( OLEDs), because they are simple to synthesize and have excellentt hermal properties, high photoluminescence quantum yields (PLQYs), and bipolar properties. Herein, an ovel blue-green emitting material,, containing a t-APE [1-(9-anthryl)-2-phenylethene] core and aP Im oiety was designed and synthesized.O wing to the PI skeleton, APE-PPI possesses high thermal stability and ah ighP LQY,a nd the compound exhibits bipolar transporting characteristics, which were identified by single-carrier devices. Nondoped bluegreen OLEDs with APE-PPI as the emitting layer show emission at l = 508 nm, af ull width at half maximum of 82 nm, a maximum brightness of 9042cdm À2,amaximum current efficiency of 2.14 cd A À1,a nd CommissionI nternationaled e L'Eclairage (CIE) coordinates of (0.26, 0.55). Furthermore, a white OLED (WOLED) was fabricated by employing APE-PPI as the blue-green emitting layer and 4-(dicyanomethylene)-2-tert-butyl-6-(1,1,7,7-tetramethyljulolidin-4-yl-vinyl)-4H-pyran (DCJTB) doped in tris-(8-hydroxyquinolinato)aluminum (Alq 3 ) as the red-green emitting layer.T his WOLED exhibited a maximum brightness of 10029 cd m À2,amaximum current efficiency of 16.05 cd A À1 ,C IE coordinates of (0.47, 0.47), and ac olor rendering index (CRI) of 85. The high performance of APE-PPI-based devices suggestst hat the t-APE and PI combination can potentially be used to synthesize efficient electroluminescent materials for WOLEDs.

Rational Synthesis of Tetrahydrodibenzophenanthridine and Phenanthroimidazole as Efficient Blue Emitters and their Applications

“…It was then purified by chromatography using hexane/ethyl acetate (9:1) as an eluent to obtain the product as white powder (2a– j ). The characterization of compounds 2a – j were matched with previous reported work . Quantitative yield: 75–90 %.…”

Advances in Host-Free White Organic Light-Emitting Diodes Utilizing Thermally Activated Delayed Fluorescence: A Comprehensive Review

“…In 2022, Zhang et al [87] addressed this issue by incorporating the excellent bipolar TADF material, 1-( 4 The utilization of SpiroAC-TRZ as a bipolar transport material in WOLEDs not only benefits the device's electrical characteristics but also contributes to improved exciton diffusion and reduced exciton confinement, thereby simplifying efficiency roll-off. SpiroAC-TRZ's inherent bipolar transport properties enable efficient charge carrier migration in the device structure, resulting in a low turn-on voltage [83,88,89]. Furthermore, the incorporation of SpiroAC-TRZ as a blue TADF emissive layer facilitates balanced charge The utilization of SpiroAC-TRZ as a bipolar transport material in WOLEDs not only benefits the device's electrical characteristics but also contributes to improved exciton diffusion and reduced exciton confinement, thereby simplifying efficiency roll-off.…”

“…Furthermore, the incorporation of SpiroAC-TRZ as a blue TADF emissive layer facilitates balanced charge The utilization of SpiroAC-TRZ as a bipolar transport material in WOLEDs not only benefits the device's electrical characteristics but also contributes to improved exciton diffusion and reduced exciton confinement, thereby simplifying efficiency roll-off. SpiroAC-TRZ's inherent bipolar transport properties enable efficient charge carrier migration in the device structure, resulting in a low turn-on voltage [83,88,89]. Furthermore, the incorporation of SpiroAC-TRZ as a blue TADF emissive layer facilitates balanced charge transport, expanded exciton distribution [90], reduced exciton quenching, and enhanced efficiency, increasing the device stability [91].…”

Impact of tunable 2-(1H-indol-3-yl)acetonitrile based fluorophores towards optical, thermal and electroluminescence properties

“…Due to the specic solvent effect divergence from linear dependence, may result from solute-solvent interactions and large difference in dipole-dipole (enhance the charge transfer) interactions in the excited state. 30…”