Fluorene based amorphous hole transporting materials for solution processed organic light-emitting diodes

Dubey, Deepak Kumar; Kručaitė, Gintarė; Swayamprabha, Sujith Sudheendran; Yadav, Rohit Ashok Kumar; Blaževičius, Dovydas; Tagare, Jairam; Chavhan, Sudam; Hsueh, Tsung-Chia; Vaidyanathan, Sivakumar; Grigalevičius, Saulius; Jou, Jwo‐Huei

doi:10.1016/j.orgel.2020.105633

Cited by 21 publications

(14 citation statements)

References 62 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…11–14 However, the devices are fabricated using a thermal evaporation process which makes the process overall quite expensive with numerous disadvantages such as high-power consumption, restrictions in scalability, decreased throughput, high rate of material consumption, complex color patterning process and non-uniform film deposition for large area fabrication while maintaining an enhanced resolution in pixels. 15–17 This also delays the further commercialization and adoption of the OLED technology due to the high costs involved. The adoption of solution-processable fabrication processes can mitigate this problem by providing an inexpensive pathway for the fabrication of large-area efficient devices with a much higher utilization rate of materials.…”

Section: Introductionmentioning

confidence: 99%

Solution-processable phenothiazine and phenoxazine substituted fluorene cored nanotextured hole transporting materials for achieving high-efficiency OLEDs

et al. 2022

Self Cite

View full text Add to dashboard Cite

show abstract

Section: Introductionmentioning

confidence: 99%

Solution-processable phenothiazine and phenoxazine substituted fluorene cored nanotextured hole transporting materials for achieving high-efficiency OLEDs

et al. 2022

Self Cite

View full text Add to dashboard Cite

show abstract

“…This prevents the exciton energy transfer from the host to the hole-transporting layer and maintains the position of the recombination zone. 70 Also, pyrene–pyridine-based hole-transporting materials demonstrate a better electron blocking layer as compared to NPB. The relatively higher triplet energy of Py-Br (2.62 eV) than that of the host material (CBP) possibly helps in confining the triplet excitons within the emission layer most effectively as compared to NPB-based devices, resulting in improved device performance of Py-Br ( Figure 8 ).…”

Section: Resultsmentioning

confidence: 99%

Functional Pyrene–Pyridine-Integrated Hole-Transporting Materials for Solution-Processed OLEDs with Reduced Efficiency Roll-Off

et al. 2021

Self Cite

View full text Add to dashboard Cite

A series of new functional pyridine-appended pyrene derivatives, viz., 2,6-diphenyl-4-(pyren-1-yl)pyridine ( Py-03 ), 2,6-bis(4-methoxyphenyl)-4-(pyren-1-yl)pyridine ( Py-MeO ), 4-(pyren-1-yl)-2,6-di- p -tolylpyridine ( Py-Me ), and 2,6-bis(4-bromophenyl)-4-(pyren-1-yl)pyridine ( Py-Br ) were designed, developed, and studied as the hole-transporting materials (HTMs) for organic light-emitting diode (OLED) application. The crystal structures of two molecules revealed to have a large dihedral angle between the pyrene and pyridine units, indicating poor π-electronic communication between them due to ineffective orbital overlap across the pyrene–pyridine systems as the two p-orbitals of pivotal atoms are twisted at 66.80° and 68.75° angles to each other in Py-03 and Py-Me , respectively. The influence of variedly functionalized pyridine units on the electro-optical properties and device performance of the present integrated system for OLED application was investigated. All of the materials have suitable HOMO values (5.6 eV) for hole injection by closely matching the HOMOs of indium tin oxide (ITO) and the light-emitting layer. All of the synthesized molecules have suitable triplet energies, glass transition temperatures, and melting temperatures, which are highly desirable for good HTMs. The pyrene–pyridine-based devices demonstrated stable performance with low-efficiency roll-off. The device with Py-Br as HTM showed a maximum luminance of 17300 cd/m 2 with a maximum current efficiency of 22.4 cd/A and an EQE of 9% at 3500 cd/m 2 with 7% roll-off from 1000 to 10 000 cd/m 2 . Also, the devices with Py-Me and Py-03 showed performance roll-up while moving from 1000 to 10 000 cd/m 2 .

show abstract

“…The recorded E T of compounds 1.1 and 1.2 are 2.38 and 2.28 eV, respectively. The better OLED performance of 1.1 is consistent with the small energy transfer barrier (0.17 eV) with CBP (2.55 eV) that ensures efficient harvesting of excitons with favorable charge balance and energy transfer in the devices …”

Section: Resultsmentioning

confidence: 99%

Molecular Engineering for the Development of a Discotic Nematic Mesophase and Solid-State Emitter in Deep-Blue OLEDs

Yadav²,

Yadav

et al. 2021

J. Org. Chem.

Self Cite

View full text Add to dashboard Cite

A unique strategy for the attainment of a discotic nematic (ND) mesophase is reported consisting of a central benzene core to which are attached two 4-alkylphenyl and two 4-pentylbiphenyl moieties diagonally via alkynyl linkers. The rotational nature and incompatibility of unequal phenylethynyl units led to the disruption of π–π interactions within cores that aids to the realization of ND phase and favors high solid-state emission. When used in OLEDs, compounds act as an efficient solid-state pure deep-blue emitter with Commission Internationale de L’Eclairage (CIE x,y ) coordinates of (0.16, 0.07).

show abstract

Fluorene based amorphous hole transporting materials for solution processed organic light-emitting diodes

Cited by 21 publications

References 62 publications

Solution-processable phenothiazine and phenoxazine substituted fluorene cored nanotextured hole transporting materials for achieving high-efficiency OLEDs

Solution-processable phenothiazine and phenoxazine substituted fluorene cored nanotextured hole transporting materials for achieving high-efficiency OLEDs

Functional Pyrene–Pyridine-Integrated Hole-Transporting Materials for Solution-Processed OLEDs with Reduced Efficiency Roll-Off

Molecular Engineering for the Development of a Discotic Nematic Mesophase and Solid-State Emitter in Deep-Blue OLEDs

Contact Info

Product

Resources

About