Arylfluorenyl-substituted metoxytriphenylamines as deep blue exciplex forming bipolar semiconductors for white and blue organic light emitting diodes

Cekaviciute, Monika; Simokaitienė, Jūratė; Volyniuk, Dmytro; Sini, Gjergji

doi:10.1016/j.dyepig.2017.01.023

Cited by 41 publications

(21 citation statements)

References 60 publications

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“…The formation of exciplexes between the constituents of Device A EML, the ≈435 nm emission that is close to that of fluorescent NPB, and the strong quenching effect of the PL by oxygen allude to a TADF process. The EQE of ≈4% and 14 000 cd m −2 brightness of Device A are much higher than that of the reported respective deep blue exciplex TADF devices and another deep blue exciplex device with peak emission at 428 nm EQE = 1.2%, and a maximal brightness of 900 cd m −2 . We cannot however exclude other emission mechanisms due to the unexpected interactions of PPh 3 O.…”

Section: Resultscontrasting

confidence: 57%

Bright Deep Blue TADF OLEDs: The Role of Triphenylphosphine Oxide in NPB/TPBi:PPh₃O Exciplex Emission

Hippola

Danilovic

Bhattacharjee

et al. 2019

Advanced Optical Materials

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Very bright (≈14 000 cd m−2) deep blue exciplex organic light emitting diodes (OLEDs) peaking at ≈435 nm, where the photopic response is ≈0.033, and with CIE color coordinates (0.1525, 0.0820), are described. The OLED properties are interestingly linked to PPh3O (triphenylphosphine oxide) and attributes of the emitting layer (EML) comprising NPB interfacing host:guest TPBi:PPh3O 5:1 weight ratio. A neat PPh3O layer that is central for device performance follows the EML (NPB/TPBi:PPh3O 5:1/PPh3O). The bright electroluminescence originates from NPB/TPBi:PPh3O exciplexes involving triplets via thermally activated delayed fluorescence, as evident from the strong quenching of the photoluminescence (PL) by oxygen and interestingly, the monomolecular emission process. The transient PL decay times of a NPB/TPBi:PPh3O 5:1/PPh3O film are 43 ns in air versus 136, 610, and weak ≈2000 ns in N2. For comparison, the respective PL decay times of films of NPB:TPBi are 16 ns in air versus 131 and 600 ns in N2, and of NPB:PPh3O they are 29 ns in air versus 56, 483, and weak ≈2000 ns in N2. It is suspected that slow emitting states are associated with a PPh3O aggregate interacting with NPB.

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Section: Resultscontrasting

confidence: 57%

Bright Deep Blue TADF OLEDs: The Role of Triphenylphosphine Oxide in NPB/TPBi:PPh₃O Exciplex Emission

Hippola

Danilovic

Bhattacharjee

et al. 2019

Advanced Optical Materials

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“…The glass‐transition temperatures ( T g ) of pPBIPO and mBPBIPO were 81 and 110 °C, and their decomposition temperatures ( T d ) were 371 and 355 °C, respectively. The lower T d value of mBPBIPO compared with pPBIPO may be attributed to weaker molecule rigidity, owing to greater steric hindrance and severe molecule distortion . Their excellent thermal stabilities were quite significant for application in organic optoelectronic materials by using a spin‐coating process …”

Section: Resultsmentioning

confidence: 99%

Alcohol‐Soluble Electron‐Transport Materials for Fully Solution‐Processed Green PhOLEDs

Chen

Wang

Xiao

et al. 2018

Chemistry An Asian Journal

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Two alcohol-soluble electron-transport materials (ETMs), diphenyl(4-(1-phenyl-1H-benzo[d]imidazol-2-yl)phenyl)phosphine oxide (pPBIPO) and (3,5-bis(1-phenyl-1H-benzo[d]imidazol-2-yl)phenyl)diphenylphosphine oxide (mBPBIPO), have been synthesized. The physical properties of these ETMs were investigated and they both exhibited high electron-transport mobilities (1.67×10 and 2.15×10 cm V s ), high glass-transition temperatures (81 and 110 °C), and low LUMO energy levels (-2.87 and -2.82 eV, respectively). The solubility of PBIPO in n-butyl alcohol was more than 20 mg mL , which meets the requirement for fully solution-processed organic light-emitting diodes (OLEDs). Fully solution-processed green-phosphorescent OLEDs were fabricated by using alcohol-soluble PBIPO as electron-transport layers (ETLs), and they exhibited high current efficiencies, power efficiencies, and external quantum efficiencies of up to 38.43 cd A , 26.64 lm W , and 10.87 %, respectively. Compared with devices that did not contain PBIPO as an ETM, the performance of these devices was much improved, which indicated the excellent electron-transport properties of PBIPO.

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“…were estimated using Electrothermal Mel-Temp apparatus. Photoluminescence spectra and UV spectra of dilute toluene solutions and of thin films prepared by vacuum deposition were recorded with the Edinburgh Instruments FLS980 and PerkinElmer Lambda 25 spectrometers, respectively.T os eparate phosphores-cence spectra of the films of emission spectra were recorded at 77 Kw ith the delay time exceeding 50 ms. [45] Edinburgh Instruments FLS980 spectrometer and PicoQuant LDH-d-C-375 laser (wavelength 374 nm) as the excitation source were used for recording photoluminescence (PL) decay curves and PL intensity dependencies on laser flux of samples at room temperature. Fluorescence quantum yields were measured using an integrated sphere (inner diameter of 120 mm) spherical cavity calibrated with two analytical standards:q uinine sulfate in 0.1 m H 2 SO 4 and rhodamine 6G in ethanol.…”

Section: Experimental Section Instrumentationmentioning

confidence: 99%

Aggregation‐Enhanced Emission and Thermally Activated Delayed Fluorescence of Derivatives of 9‐Phenyl‐9H‐Carbazole: Effects of Methoxy and tert‐Butyl Substituents

Grybauskaite-Kaminskiene

Volyniuk

Mimaitė

et al. 2018

Chemistry A European J

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Derivatives of 9-phenyl-9H-carbazole were synthesized as efficient emitters exhibiting both thermally activated delayed fluorescence and aggregation-induced emission enhancement. Effects of methoxy and tert-butyl substituents at the different positions of carbazolyl groups on the properties of the emitters were studied. Depending on the substitutions, photoluminescence quantum yields (PLQY) of non-doped solid films of the compounds ranged from 17 % to 53 % which were much higher than those observed for the solutions in low-polarity solvent toluene. Compounds substituted at C-3 and C-6 positions of carbazole moiety by methoxy- and tert-butyl- groups showed the highest solid-state PLQY. Ionization potentials of the studied derivatives in solid-state were found to be in the short range of 5.75-5.89 eV. Well-balanced hole and electron mobilities were detected for tert-butyl-substituted compound. They exceeded 10 cm (V×s) at electric fields higher than 3×10 V cm . Two compounds with the highest solid-state PLQYs showed higher efficiencies in non-doped organic light-emitting diodes than in the doped devices. Maximum external quantum efficiency of 7.2 % and brightness of 15000 cd m were observed for the best device.

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Arylfluorenyl-substituted metoxytriphenylamines as deep blue exciplex forming bipolar semiconductors for white and blue organic light emitting diodes

Cited by 41 publications

References 60 publications

Bright Deep Blue TADF OLEDs: The Role of Triphenylphosphine Oxide in NPB/TPBi:PPh₃O Exciplex Emission

Bright Deep Blue TADF OLEDs: The Role of Triphenylphosphine Oxide in NPB/TPBi:PPh₃O Exciplex Emission

Alcohol‐Soluble Electron‐Transport Materials for Fully Solution‐Processed Green PhOLEDs

Aggregation‐Enhanced Emission and Thermally Activated Delayed Fluorescence of Derivatives of 9‐Phenyl‐9H‐Carbazole: Effects of Methoxy and tert‐Butyl Substituents

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Arylfluorenyl-substituted metoxytriphenylamines as deep blue exciplex forming bipolar semiconductors for white and blue organic light emitting diodes

Cited by 41 publications

References 60 publications

Bright Deep Blue TADF OLEDs: The Role of Triphenylphosphine Oxide in NPB/TPBi:PPh3O Exciplex Emission

Bright Deep Blue TADF OLEDs: The Role of Triphenylphosphine Oxide in NPB/TPBi:PPh3O Exciplex Emission

Alcohol‐Soluble Electron‐Transport Materials for Fully Solution‐Processed Green PhOLEDs

Aggregation‐Enhanced Emission and Thermally Activated Delayed Fluorescence of Derivatives of 9‐Phenyl‐9H‐Carbazole: Effects of Methoxy and tert‐Butyl Substituents

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Bright Deep Blue TADF OLEDs: The Role of Triphenylphosphine Oxide in NPB/TPBi:PPh₃O Exciplex Emission

Bright Deep Blue TADF OLEDs: The Role of Triphenylphosphine Oxide in NPB/TPBi:PPh₃O Exciplex Emission