A thermally cross-linked hole-transporting film with the remarkable solvent resistance for solution-processed OLEDs

Zhang, Yuteng; Wang, Xue; Li, Xianggao; Wang, Shirong; Pan, Yichen; Zhong, Zhou; Ying, Lei; Xiao, Yin

doi:10.1016/j.orgel.2018.03.034

Cited by 23 publications

(10 citation statements)

References 37 publications

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“…The films show the same XRD pattern before and after annealing at 90 °C for 1 h, suggesting their thermal stable amorphous structure [ 18 ]. More importantly, the BCzB-PPI exhibited the same featureless spectra as compared to the ITO substrate, which implies its weak crystallization on the ITO substrate hence guarantees high performance in the device [ 19 ]. Finally, a non-doped fluorescent OLED was fabricated with a structure of ITO/PEDOT/NPB/EML/TPBi/LiF/Al, in which PEDOT, NPB, and TPBi work as the anode buffer layer, hole transport layer, and electron transport layer, respectively.…”

Section: Resultsmentioning

confidence: 99%

Non-Doped Deep-Blue OLEDs Based on Carbazole-π-Imidazole Derivatives

Xiao

2021

Materials

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In this work, we designed and synthesized four bipolar blue-emitting materials with carbazole, imidazole, and biphenyl as donor, acceptor, and p bridge, respectively. The twisted phenylimidazole acceptor leads to a wider band-gap and hence deeper blue emission than the conjugated phenanthrimidazole acceptor. For the substituents on the carbazole donor, the t-butyl group could prevent the intramolecular charge transfer (ICT) process more effectively than the methoxy group. A non-doped deep-blue organic light-emitting diodes (OLED) is obtained with CIE coordinates of (0.159, 0.080), a maximum luminance of 11,364 cd/m2, and a maximum EQE of 4.43%.

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Section: Resultsmentioning

confidence: 99%

Non-Doped Deep-Blue OLEDs Based on Carbazole-π-Imidazole Derivatives

Xiao

2021

Materials

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“…N,N′-di-p-tolyl-N,N′-bis(4-vinylphenyl)-[1,1′-biphenyl]-4,4′-diamine (V-p-TPD) was synthesized according to the previous method of our laboratory [32]. The poly(3,4-ethylenediothiophene):poly (styrene sulfonate) (PEDOT:PSS) solution, 2,6-bis(3-(9H-carbazol-9-yl)phenyl)pyridine (DCzPPy), 9-[4-(4,6-diphenyl-1,3,5-triazin-2-yl)phenyl]-N,N,N,N′-tetraphenyl-9H-carbazole-3,6-diamine (DACT-II), and 1,3,5-tri(m-pyrid-3yl-phenyl) benzene (TmPyPb) were purchased from Xi'an Polymer Light Technology Corporation.…”

Section: Methodsmentioning

confidence: 99%

Suppressing triplet exciton quenching by regulating the triplet energy of crosslinkable hole transport materials for efficient solution-processed TADF OLEDs

et al. 2022

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Crosslinkable hole transport materials (HTMs) with high triplet energies would have a balance of carrier injection into the emitting material layer, suppressing the triplet exciton quenching and resulting in high-performance solution-processed organic light-emitting diode (OLED) devices. Two novel crosslinkable HTMs with different central units, N 2 , N 8 -di-p-tolyl-N 2 ,N 8 -bis(4-vinylphenyl)dibenzo[b,d]thiophene-2,8-diamine (V-p-DBT) and N 2 ,N 8 -di-p-tolyl-N 2 ,N 8 -bis(4-vinylphenyl)dibenzo[b,d]furan-2,8-diamine (V-p-DBF), were designed and synthesized. The use of dibenzothiophene and dibenzofuran units increases the torsion angle compared with the commonly used N,N'-di-p-tolyl-N,N'-bis(4-vinylphenyl)-[1,1'-biphenyl]-4,4'-diamine (V-p-TPD), leading to high triplet energies of 2.57 and 2.64 eV, respectively. The triplet energies of V-p-DBT and V-p-DBF effectively suppress triplet exciton quenching. Furthermore, the crosslinked HTM layer showed excellent solvent-resistant abilities and high thermal stability. An outstanding maximum current efficiency (CE max ) of 79.94 cd A −1 and maximum external quantum efficiency (EQE max ) of 24.35% were obtained by V-p-DBF-based green thermally activated delayed fluorescent (TADF) OLEDs. This work provides a new molecular design strategy for achieving efficient solution-processed TADF OLEDs.

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“…However, interlayer miscibility suffered by the prepared layer due to ugly erosion by the solvent originating from the preparation of upper films is inevitable in solution processes. 15,16 To address this issue, the cross-linking strategy has been reported to endow the functional layers with good solvent resistance. 17,18 In the preparation of multilayer OLEDs, a cross-linked hole transport layer (HTL) provides a platform to prepare the emitting layer (EML) by the solution method.…”

Section: Introductionmentioning

confidence: 99%