Synthesis and characterization of pure and Li<sup>+</sup> activated Alq<sub>3</sub> complexes for green and blue organic light emitting diodes and display devices

Bhagat, Shubham; Borghate, S. V.; Kalyani, N. Thejo; Dhoble, S.J.

doi:10.1002/bio.2566

Cited by 12 publications

(5 citation statements)

References 23 publications

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“…Organic light‐emitting devices (OLEDs) have been intensively studied due to their potential application in flat‐panel displays. Although the development of red‐emitting OLEDs has progressed greatly, the development of high color‐purity red OLEDs is still much in demand.…”

Section: Introductionmentioning

confidence: 99%

Efficient solution‐processed double‐layer red OLEDs based on a new europium complex with a carbazole group

Liu

Miao

2014

Luminescence

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A new europium complex EuL3 (Phen) was used as guest dopant, and a blend of Polyvinylcarbazole and 2-(biphenyl-4-yl)-5-(4-tert-butylphenyl)-1,3,4-oxadiazole (PVK and PBD) as host matrix. Efficient red organic light-emitting devices (OLEDs) with double-layer structures were manufactured via a solution-processed technique. The guest-doped levels were 1, 3 and 5 wt% relative to the blend mass, respectively. For the 1 wt% doping-level device, the luminous efficiency and luminance were up to 2.96 cd/A and 635.78 cd/m(2) with emissions from both EuL3 (Phen) and from the host; for the 3 wt% doping-level device, the maximum luminous efficiency and luminance were 1.01 cd/A and 370.91 cd/m(2) for the single emission from EuL3 (Phen) only.

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Section: Introductionmentioning

confidence: 99%

Efficient solution‐processed double‐layer red OLEDs based on a new europium complex with a carbazole group

Liu

Miao

2014

Luminescence

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“…The optical transmittance curves of the tested samples are shown in Figure b. Compared with the higher energy band gap of CN-T2T ( E g = 3.9 eV), Bebq 2 , with a narrower energy band gap of E g = 2.7 eV, presented lower transmittance in the wavelength ranging from 400 to 450 nm. , In addition, the transmittance of the Bebq 2 -based samples decreased significantly as the Li 2 CO 3 doping concentration increased, possibly due to the influence of Li atoms on the metal–ligand interaction of Bebq 2 . In contrast, the CN-T2T-based samples using different Li 2 CO 3 concentrations exhibited similar transmittance curves in the wavelength ranging from 400 to 500 nm.…”

Section: Resultsmentioning

confidence: 99%

Enhancing Tandem Organic Light-Emitting Diode Performance with Multiple Electroluminescent Units

et al. 2023

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Tandem organic light-emitting diodes (TOLEDs) which stack multiple electroluminescent units (EUs) via a charge-generation layer (CGL) are advanced device designs that improve the electroluminescent (EL) performance and operating lifetime. However, each CGL used in a device with multiple EUs is affected by electrodes and the other CGLs, resulting in a suboptimal ability to generate carriers and thus decreasing device efficiency and luminance values. Herein, four specific designs, including an effective CGL structure, an exciplex host for the emitting layer (EML), simplified device architectures, and nanoparticle-based diffusers, are proposed to realize highly efficient TOLEDs, aiming to sustain or even surpass the external quantum efficiency linearity with the number of stacked EUs. Aside from the heterojunction structure of the CGL, the n-type electron injection layer also plays a critical role in efficient charge generation. In addition, the exciplex host used in the EML could improve the carrier balance and reduce the operating voltages. The EL efficiency of the three-stacked tandem device reaches 78.7% (303.5 cd A–1), about 2.5 times that of the conventional device, which fails to meet the expected value. When a nanoparticle-based diffuser layer was inserted between the substrate and the anode of the three-stacked TOLEDs, the EL efficiency of the device rose to 123.9% (456.9 cd A–1), about 3.9-fold that of the conventional device. Furthermore, an ultra-high maximum luminance of 411,531 cd m–2 could be obtained, exceeding that of the conventional device by 5.8 times. Notably, the maximum current efficiency of device T3D reaches record highs compared to the reported green TOLEDs. These results demonstrate the viability of practical design strategies for TOLEDs with multiple EUs for realizing high EL efficiency and luminance values, thus fulfilling the requirements for OLED phototherapy and display applications.

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“…This emission wavelength matches well with the green emission of yellowish green powder reported earlier and is attributed to the α‐phase of the meridianal isomer of Alq 3 . The PL excitation spectrum at 455 nm of prepared Alq 3 powder reveals that the prepared phosphor is suitable not only for OLEDs, but also for PL, flat‐panel displays and solid‐state lighting applications.…”

Section: Excitation and Emission Pl Spectra Of Alq3 And Na+‐doped Alq3mentioning

confidence: 94%

Novel Na⁺ doped Alq₃ hybrid materials for organic light‐emitting diode (OLED) devices and flat panel displays

Bhagat¹,

Borghate²,

Kalyani

et al. 2014

Luminescence

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Pure and Na(+) -doped Alq3 complexes were synthesized by a simple precipitation method at room temperature, maintaining a stoichiometric ratio. These complexes were characterized by X-ray diffraction, Fourier transform infrared (FTIR), UV/Vis absorption and photoluminescence (PL) spectra. The X-ray diffractogram exhibits well-resolved peaks, revealing the crystalline nature of the synthesized complexes, FTIR confirms the molecular structure and the completion of quinoline ring formation in the metal complex. UV/Vis absorption and PL spectra of sodium-doped Alq3 complexes exhibit high emission intensity in comparison with Alq3 phosphor, proving that when doped in Alq3 , Na(+) enhances PL emission intensity. The excitation spectra of the synthesized complexes lie in the range 242-457 nm when weak shoulders are also considered. Because the sharp excitation peak falls in the blue region of visible radiation, the complexes can be employed for blue chip excitation. The emission wavelength of all the synthesized complexes lies in the bluish green/green region ranging between 485 and 531 nm. The intensity of the emission wavelength was found to be elevated when Na(+) is doped into Alq3 . Because both the excitation and emission wavelengths fall in the visible region of electromagnetic radiation, these phosphors can also be employed to improve the power conversion efficiency of photovoltaic cells by using the solar spectral conversion principle. Thus, the synthesized phosphors can be used as bluish green/green light-emitting phosphors for organic light-emitting diodes, flat panel displays, solid-state lighting technology - a step towards the desire to reduce energy consumption and generate pollution free light.

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Synthesis and characterization of pure and Li⁺ activated Alq₃ complexes for green and blue organic light emitting diodes and display devices

Cited by 12 publications

References 23 publications

Efficient solution‐processed double‐layer red OLEDs based on a new europium complex with a carbazole group

Efficient solution‐processed double‐layer red OLEDs based on a new europium complex with a carbazole group

Enhancing Tandem Organic Light-Emitting Diode Performance with Multiple Electroluminescent Units

Novel Na⁺ doped Alq₃ hybrid materials for organic light‐emitting diode (OLED) devices and flat panel displays

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Synthesis and characterization of pure and Li+ activated Alq3 complexes for green and blue organic light emitting diodes and display devices

Cited by 12 publications

References 23 publications

Efficient solution‐processed double‐layer red OLEDs based on a new europium complex with a carbazole group

Efficient solution‐processed double‐layer red OLEDs based on a new europium complex with a carbazole group

Enhancing Tandem Organic Light-Emitting Diode Performance with Multiple Electroluminescent Units

Novel Na+ doped Alq3 hybrid materials for organic light‐emitting diode (OLED) devices and flat panel displays

Contact Info

Product

Resources

About

Synthesis and characterization of pure and Li⁺ activated Alq₃ complexes for green and blue organic light emitting diodes and display devices

Novel Na⁺ doped Alq₃ hybrid materials for organic light‐emitting diode (OLED) devices and flat panel displays