A phosphorescent OLED with an efficiency roll-off lower than 1% at 10 000 cd m<sup>−2</sup> achieved by reducing the carrier mobility of the donors in an exciplex co-host system

Chiu, Chien‐Liang; Amin, Nurul Ridho Al; Xie, Jia-Xun; Lee, Chih‐Chien; Luo, Dian; Biring, Sajal; Sutanto, Kevin; Liu, Shun‐Wei; Chen, Chih-Hsin

doi:10.1039/d1tc04473g

Cited by 12 publications

(14 citation statements)

References 29 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Gas chromatography-mass spectroscopy (GC-MS) analysis were performed employing an electronic impact (EI) ionization method and a 25 m × 0.2 mm × 0.33 μm column with a 5 % phenylpolysiloxane phase. 1 H NMR and 13 C NMR{1H} spectra were recorded on 400 MHz in spectrometer with CDCl 3 or DMSO-d 6 as solvents with TMS as internal standard. Coupling constants are given in Hz and chemical shifts are reported in δ values in ppm.…”

Section: Experimental Section General Methodsmentioning

confidence: 99%

“…Samples were irradiated using blue LED (3 W, 467 nm), green LED (3 W, λ = 522 nm), violet LED (3 W, λ = 395 nm) or HPIT (400 W, λ � 350 nm). [b] Yields were quantified by1 H NMR using 4-Nitroacetophenone as standard. [c] Same as entry 2 of Table 1.…”

mentioning

confidence: 99%

“…N4 ,N 4 '-bis(3-bromo-5-methylpyridin-2-yl)-[1,1'-biphenyl]-4,4'-diamine (5 h) Titled compound was obtained according to Method A from 4,4'-diiodo-1,1'-biphenyl and 3-bromo-5-methylpyridin-2amine, and purified by column chromatography on silica gel eluting with hexane/ethyl acetate (70 : 30). Light yellow solid was isolated in 6 % yield (0.06 mmol, 31.5 mg) 1. H NMR (400 MHz, DMSO-d 6 ) δ '-(2-bromophenyl)-[1,1'-biphenyl]-4,4'-diamine (5 i) Titled compound was obtained according to Method A from N-(2-bromophenyl)-4'-iodo-[1,1'-biphenyl]-4-amine (3 j-s) and 2-bromo-4-methylaniline, and purified by column chromatography on silica gel eluting with hexane/DMC (60 : 40).…”

mentioning

confidence: 99%

“…Na] + calcd for C 25 H 20 Br 2 N 2 Na + 528.9885; found 528.9863. °C 1. H NMR (400 MHz, CDCl 3 ) δ 7.50 (dd, J = 8.0, 1.4 Hz, 2H), 7.30 (dt, J = 7.3, 3.6 Hz, 2H), 7.19-7.10 (m, 2H), 7.07 (dd, J = 6.0, 3.5 Hz, 2H), 7.01 (dd, J = 8.2, 1.5 Hz, 2H), 6.78-6.68 (ddd, J = 7.9, 7.4, 1.5, 2H), 6.10 (s br, 2H) 13.…”

mentioning

confidence: 99%

See 3 more Smart Citations

Construction of 3,3'‐Bicarbazoles and Indolocarbazoles by Using Visible Light

2022

View full text Add to dashboard Cite

A synthetic and mechanistic study of novel iterative double cyclization intramolecular S RN 1 reactions from diarylamines bearing two aryl halide moieties was carried out. This cyclization affords symmetric and unsymmetric 3,3'-bicarbazoles and indolocarbazoles compounds in regular to very good yields. The synthetic strategy employed for their preparation was a Buchwald-Hartwig arylation of anilines followed by an intra-molecular S RN 1 reaction, in the presence of base and visible light, at room temperature. The mechanism is non-trivial and it was studied using spectroscopy and computational calculations, employing the DFT method, with B3LYP and M06-2X functionals and 6-31 + G*, def2SVP and def2TZVP as bases and radicals are proposed as intermediates.

show abstract

Section: Experimental Section General Methodsmentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

See 2 more Smart Citations

Construction of 3,3'‐Bicarbazoles and Indolocarbazoles by Using Visible Light

2022

View full text Add to dashboard Cite

show abstract

“…[9] Blends of hole and electron transport materials can lead to the creation of exciplex hosts depending on their ionization potential and electron affinities. [10] Light-emitting devices utilizing exciplex hosts have now been prepared by vacuum evaporation and solution processing methods. [11] In the latter case, exciplex hosts have been used in combination with light-emitting dendrimers to form efficient and color stable white OLEDs.…”

mentioning

confidence: 99%

Properties of Dual Emissive Dendrimers Based on ThermallyActivated Delayed Fluorescence Dendrons and a Phosphorescent Ir(ppy)₃ Core

Thamarappalli

Ranasinghe

Jang

et al. 2022

Adv Funct Materials

View full text Add to dashboard Cite

Dual emission light‐emitting dendrimers composed of phosphorescent fac‐tris[2‐phenylpyridyl]iridium(III) [Ir(ppy)3] cores and thermally activated delayed fluorescence‐based (TADF‐based) dendrons have been prepared. The TADF‐based dendrons are designed to have green or blue emission. The dendrimers show solvatochromism, with the emission switching between phosphorescence and TADF depending on the medium in which the measurement is undertaken. Time‐dependent photoluminescence (PL) spectra measurements show that the TADF dendrons can act as an energy pool for emission from the phosphorescent core. The PL quantum yields (PLQYs) are found to be strongly dependent on the dielectric constant of the solvent, ranging from as high as 76% to as low as 0.3%. Neat films of the dendrimers are found to have relatively balanced hole and electron mobilities of order 10–6 cm2 V–1 s–1, with bilayer organic light‐emitting diodes (OLEDs) containing neat emissive layers having a maximum external quantum efficiency (EQE) of 4.7% for a film having a PLQY of 12%. Finally, the solution processed OLEDs fabricated using 0.4 mol% of the dendrimers blended with 9‐[3‐(9H‐carbazol‐9‐yl)phenyl]‐9H‐carbazole‐3‐carbonitrile result in green emission with maximum EQEs of 9.8% and 15.1% for the dendrimers with green and blue emissive TADF dendrons, respectively.

show abstract

Organic light‐emitting diode behaviors of some synthesized platinum(II)‐based complexes

Üngördü

2023

Int J of Quantum Chemistry

View full text Add to dashboard Cite

Organic light‐emitting light diodes (OLEDs) have been increasingly used in displays, replacing liquid‐crystal displays (LCD) and light‐emitting diodes (LEDs) panels. The increase in commercial use of OLED has led to the search for OLED with high performance. For that reason, the OLED properties of monomers and dimers of some synthesized platinum(II)‐based complexes were estimated by using different computational chemistry tools with different codes. The electron/hole reorganization energies, the adiabatic/vertical ionization potentials, the adiabatic/vertical electron affinities, the chemical hardness values, the dipole moments, the frontier orbital shapes/energy levels, the energy gaps, the emission wavelengths, spin‐orbit matrix elements, the rates of reverse intersystem crossing and intersystem crossing of the investigated complexes were determined. From the theoretically obtained data, it was found that Pt(hppz)2 and Pt(fppz)2 complexes can be used as electron transfer material. Furthermore, it was stated that Pt(f2bipz)(bpy) is both electron‐blocking layer and hole blocking layer materials. Moreover, it was noted that that PtOEP complex can be utilized as a good electron injection layer and hole injection layer material. Addition to these, it was emphasized that that Pt(f2bipz)(bpy) can be considered as a good candidate for near infrared organic light emitting diodes and thermal activated delayed fluorescent organic light emitting diodes. In light of computational chemistry, it should be expected that the study will provide a great contribution to studies related to organic light emitting diodes.

show abstract

A phosphorescent OLED with an efficiency roll-off lower than 1% at 10 000 cd m⁻² achieved by reducing the carrier mobility of the donors in an exciplex co-host system

Abstract: 9,9'-Diphenyl-9H,9'H-3,3'-bicarbazole (BCzPh)-based molecules have been applied as the donor in exciplex co-host system in OLEDs to achieve high device performance. In this work, to investigate the effect of charge mobility...

Cited by 12 publications

References 29 publications

Construction of 3,3'‐Bicarbazoles and Indolocarbazoles by Using Visible Light

Construction of 3,3'‐Bicarbazoles and Indolocarbazoles by Using Visible Light

Properties of Dual Emissive Dendrimers Based on ThermallyActivated Delayed Fluorescence Dendrons and a Phosphorescent Ir(ppy)₃ Core

Organic light‐emitting diode behaviors of some synthesized platinum(II)‐based complexes

Contact Info

Product

Resources

About

A phosphorescent OLED with an efficiency roll-off lower than 1% at 10 000 cd m−2 achieved by reducing the carrier mobility of the donors in an exciplex co-host system

Abstract: 9,9'-Diphenyl-9H,9'H-3,3'-bicarbazole (BCzPh)-based molecules have been applied as the donor in exciplex co-host system in OLEDs to achieve high device performance. In this work, to investigate the effect of charge mobility...

Cited by 12 publications

References 29 publications

Construction of 3,3'‐Bicarbazoles and Indolocarbazoles by Using Visible Light

Construction of 3,3'‐Bicarbazoles and Indolocarbazoles by Using Visible Light

Properties of Dual Emissive Dendrimers Based on ThermallyActivated Delayed Fluorescence Dendrons and a Phosphorescent Ir(ppy)3 Core

Organic light‐emitting diode behaviors of some synthesized platinum(II)‐based complexes

Contact Info

Product

Resources

About

A phosphorescent OLED with an efficiency roll-off lower than 1% at 10 000 cd m⁻² achieved by reducing the carrier mobility of the donors in an exciplex co-host system

Properties of Dual Emissive Dendrimers Based on ThermallyActivated Delayed Fluorescence Dendrons and a Phosphorescent Ir(ppy)₃ Core