High electroluminescence efficiency and long device lifetime of a fluorescent green-light emitter using aggregation-induced emission

Jung, Hyocheol; Shin, Hoon−Kyu; Kim, Siin; Kim, Joonghan; An, Byeong‐Kwan; Lee, Jihoon; Ihee, Hyotcherl; Park, Jong‐Wook

doi:10.1016/j.jiec.2020.04.003

Cited by 7 publications

(6 citation statements)

References 31 publications

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“…The corresponding absolute PLQY values were 34%, 36%, and 37%, respectively, for TDBA-BCZ and 48%, 58%, and 52%, respectively, for TDBA-PCZ. Interestingly, both emitters exhibited higher PLQY values in the neat-film state than in the solution state, suggesting an aggregation-induced emission (AIE) effect [ 41 , 42 , 43 , 44 ]. In order to investigate the AIE effect of the two emitters, we measured the PLQY values of TDBA-BCZ and TDBA-PCZ in THF/water mixtures with different water fractions (fws) ( Figure S5 ).…”

Section: Resultsmentioning

confidence: 99%

“…This phenomenon is attributed to the AIE phenomenon without the conventional AIE chemical structure and is caused by the highly twisted structure. It is also attributable to the nonradiative process being inhibited by the limitation of intermolecular motion [ 41 ]. We also recorded time-resolved PL spectra to examine the excited-state behaviors of the two emitters ( Figure 2 c,d).…”

Section: Resultsmentioning

confidence: 99%

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Organic–Inorganic Hybrid Device with a Novel Deep-Blue Emitter of a Donor–Acceptor Type, with ZnO Nanoparticles for Solution-Processed OLEDs

et al. 2022

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Two new deep-blue emitters with bipolar properties based on an organoboron acceptor and carbazole donor were newly synthesized: 2-(9H-carbazol-9-yl)-5-(2,12-di-tert-butyl-5,9-dioxa-13b-boranaphtho [3,2,1-de]anthracen-7-yl)-5H-benzo[b]carbazole (TDBA-BCZ) and 5-(2,12-di-tert-butyl-5,9-dioxa-13b-boranaphtho [3,2,1-de]anthracen-7-yl)-8-phenyl-5,8-dihydroindolo[2,3-c]carbazole (TDBA-PCZ). The two emitters showed deep-blue and real-blue photoluminescence emission in their solution and film states, respectively. The doped spin-coated films were prepared using synthesized materials and showed a root-mean-square roughness of less than 0.52 nm, indicating excellent surface morphology. The doped devices, fabricated via a solution process using TDBA-BCZ and TDBA-PCZ as the dopants, showed electroluminescence peaks at 428 and 461 nm, corresponding to the Commission Internationale de L’éclairage (CIE) coordinates of (0.161, 0.046) and (0.151, 0.155), respectively. The external quantum efficiency (EQE)/current efficiency (CE) of the solution-processed forward devices, with TDBA-BCZ and TDBA-PCZ as dopants, were 7.73%/8.67 cd/A and 10.58%/14.24 cd/A, respectively. An inverted OLED device fabricated using rod-shaped ZnO nanoparticles as an electron injection layer showed a CE of 1.09 cd/A and an EQE of 0.30%.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Organic–Inorganic Hybrid Device with a Novel Deep-Blue Emitter of a Donor–Acceptor Type, with ZnO Nanoparticles for Solution-Processed OLEDs

et al. 2022

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“…However, in the excited sta molecule is affected by both the generated charge within the molecule and the so polarity. As a result, as the dielectric constant of the solvent increases, the molecule acts more with the dipole of the solvent, stabilizing the excited state and reducin band gap, leading to a gradual red shift in the PL max value [27]. The photoluminescence quantum yields (PLQY) values of DTPCZ were 43.2% in the solution state and 18.9% in the film state.…”

Section: Optical Properties and Theoretical Calculationsmentioning

confidence: 99%

Synthesis and Electrical Properties of a New Bipolar Material Using Spacer Moiety

Jo,

Park,

Kwon

et al. 2024

Applied Sciences

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To develop a deep-blue emitter, a molecule with bipolar characteristics was designed as a donor-spacer-acceptor type, in which 9-(4-(4,6-diphenyl-1),3,5-triazin-2-yl)-2,5-dimethylphenyl)-9H-carbazole (DTPCZ)—with carbazole as an electron donating group and a diphenyl triazine moiety as an electron accepting group—was successfully synthesized. The photoluminescence (PL) maxima of DTPCZ were 421 nm in the solution state and 425 nm in the film state, indicating emission in the deep-blue region. DTPCZ also exhibited high thermal stability, with a degradation temperature of 349 °C. To confirm the electroluminescence (EL) characteristics, DTPCZ was applied as a dopant at 10, 20, and 30 wt% in a blue-fluorescent organic light-emitting diode (OLED) device. The highest efficiency was achieved using the 20 wt% doped device, with a current efficiency of 1.2 cd/A, an external quantum efficiency of 2.3%, and a Commission Internationale de l’Eclairage proceedings y-value of 0.06. Thus, deep-blue emission could be realized in the film state. These molecular design strategies can be applied to various fields, such as organic semiconductors.

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“…10 The electron-accepting nature of triazines makes them suitable for synthesising fluorescent green-light emitters with long device lifetimes and high electroluminescence efficiency. 11 While this class of compounds is important, systematic, feasible, and versatile methods for producing suitable 1,2,4-triazine skeletons are lacking. Among the reported approaches to the formation of 1,2,4-triazines, reacting 1,2-diketone and amidrazone mixtures is the most accessible procedure for synthesising substituted 1,2,4-trizaines.…”

Section: Introductionmentioning

confidence: 99%

A trinuclear cobalt coordination complex constructed using novel triazine ligandsviaone-pot green synthesis: structural properties and biological evaluation

et al. 2023

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High electroluminescence efficiency and long device lifetime of a fluorescent green-light emitter using aggregation-induced emission

Cited by 7 publications

References 31 publications

Organic–Inorganic Hybrid Device with a Novel Deep-Blue Emitter of a Donor–Acceptor Type, with ZnO Nanoparticles for Solution-Processed OLEDs

Organic–Inorganic Hybrid Device with a Novel Deep-Blue Emitter of a Donor–Acceptor Type, with ZnO Nanoparticles for Solution-Processed OLEDs

Synthesis and Electrical Properties of a New Bipolar Material Using Spacer Moiety

A trinuclear cobalt coordination complex constructed using novel triazine ligandsviaone-pot green synthesis: structural properties and biological evaluation

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