A new insight into the temperature induced molecular aggregations in tris(8-hydroxyquinoline) metals

Muhammadsharif, Fahmi F.; Hashim, Suhairul; Sulaiman, Khaulah; Baldacchini, G.

doi:10.1016/j.jmrt.2020.02.084

Cited by 9 publications

(2 citation statements)

References 64 publications

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“…Therefore, triplet excitons can be upconverted to singlets by RISC in TADF materials with a small ΔE ST , which then emit fluorescence through radiation transition, so that in theory, the internal quantum efficiency (IQE) can reach 100%. However, due to the molecular aggregation of TADF OLEDs by solution processing and the long triplet exciton lifetime of TADF materials, the quenching problem of triplet–triplet annihilation (TTA) and triplet-polaron quenching (TPQ) in devices is acute, which seriously reduces the efficiency of TADF OLEDs at high current density [ 7 , 8 ]. In order to improve the efficiency of the roll-off of TADF devices, two essential problems need to be solved.…”

Section: Introductionmentioning

confidence: 99%

The Improvement of the Performance of Sky-Blue OLEDs by Decreasing Interface Traps and Balancing Carriers with PSVA Treatment

et al. 2022

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The mitigation of interfacial charge accumulation in solution-processed organic light-emitting diodes (s-OLEDs) is an effective method to improve device performance. In this study, the polar solvent vapor annealing (PSVA) method was used to treat two layers in s-OLED, PEDOT:PSS and mCP:DMAC-DPS emitting layers, separately, to optimize the carrier transmission and balance. After the double-layer PSVA treatment, the current efficiency increased, the lifetime of the device is improved, the efficiency roll-off alleviated from 33.3% to 26.6%, and the maximum brightness increased by 31.3%. It is worth mentioning that the work function of the EML interface reduced by 0.36 eV, and the initial injection voltage of the electrons also reduced. Simulating the solubility of the LUMO and HOMO molecule parts of the mCP and DMAC-DPS, it was found that the LUMO parts had stronger polarity and higher solubility in polar solution than the HOMO parts. By comparing the untreated luminescent layer films, it was found that the PSVA treatment improved the uniformity of the film morphology. We may infer that a more ordered molecular arrangement enhances carrier transport as the LUMO parts tend to be close to the surface and the reduced local state traps on the EML surface promote electron injection. According to the experimental results, the injection of holes and electrons is enhanced from both sides of the EML, respectively, and the charge accumulated at the interface of s-OLEDs is significantly reduced due to the improvement of carrier-transported characteristics.

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Section: Introductionmentioning

confidence: 99%

The Improvement of the Performance of Sky-Blue OLEDs by Decreasing Interface Traps and Balancing Carriers with PSVA Treatment

et al. 2022

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“…A new and facile method for fabricating organic small molecules with nitrogen-rich heteroatoms may stimulate further investigations of the performance of tubular structures. 16 The preparation methods of organic semiconductor nanomaterials mainly include self-assembly, vacuum evaporation, reprecipitation, and organic vapor deposition, among which vapor deposition is considered to be simple operation, easy control, and readily available nanomaterials. 17 In this paper, Alq3 nanofilms were prepared on glass substrate by physical vapor deposition system with different process parameters.…”

Section: Introductionmentioning

confidence: 99%

Preparation of 8‐hydroxyquinoline aluminum nanomaterials to enhance properties for green organic light‐emitting diode devices

Duan

Yang

Wang³

et al. 2021

J Soc Info Display

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Tris(8-hydroquinoline) aluminum (Alq3) plays an important role in the applications of green organic light-emitting diodes (OLEDs). In this paper, Alq3 nanofilms were prepared on glass substrates by physical vapor deposition system with different surface states. The structures and morphologies of Alq3 nanofilms were characterized by X-ray diffractometer and scanning electron microscope. Alq3 nanomaterials were used as the main luminescent material for green OLED devices. The structure of the green OLED is Mo/2-TNATA (20 nm)/NPB (10 nm)/Alq3 (25 nm):Ir(ppy) 3 (5%)/Bphen (10 nm)/LiF (5 nm)/ Mg:Ag (10%) (10 nm). The photoelectric properties of green OLED devices were characterized by the system of Photo Research PR655 spectrometer. The results show that the weak interactions among Alq3 molecules such as π-π bond interactions and van der Waals forces caused molecules self-assembling into nanospheres, nanospherical chains, nanowires, or nanotubes in physical vapor deposition system. Precise surface state control of Alq3 nanomaterials can be realized by controlling the deposition temperature, thus, to enhance properties for green OLED displays. It is found that among different morphologies, Alq3 nanotubes have been proved to be the best green OLED devices with the brightness of 11,490 cd/m 2 , CIE (3358, 0.6302) at 5 V, and the current efficiency is 20.24 cd/A.

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Improvement of capacitive humidity sensors using tris(8-hydroxyquinoline) gallium (Gaq3) nanofibers as a dielectric layer

Rehman

Aziz

Ahmad

et al. 2020

J Mater Sci: Mater Electron

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A new insight into the temperature induced molecular aggregations in tris(8-hydroxyquinoline) metals

Cited by 9 publications

References 64 publications

The Improvement of the Performance of Sky-Blue OLEDs by Decreasing Interface Traps and Balancing Carriers with PSVA Treatment

The Improvement of the Performance of Sky-Blue OLEDs by Decreasing Interface Traps and Balancing Carriers with PSVA Treatment

Preparation of 8‐hydroxyquinoline aluminum nanomaterials to enhance properties for green organic light‐emitting diode devices

Improvement of capacitive humidity sensors using tris(8-hydroxyquinoline) gallium (Gaq3) nanofibers as a dielectric layer

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