Solution-processable red phosphorescent OLEDs based on Ir(dmpq)2(acac) doped in small molecules as emitting layer

Tselekidou, Despoina; Papadopoulos, Kyparisis; Zachariadis, Alexandros; Kyriazopoulos, V.; Kassavetis, S.; Laskarakis, A.; Gioti, M.

doi:10.1016/j.mssp.2023.107546

Cited by 9 publications

(3 citation statements)

References 42 publications

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“…In this study, the optical properties of the emissive materials were examined using the Vis-fUV SE method in the spectral region 1.5–6.5 eV. The Tauc-Lorentz model was used to derive the optical properties of each emitting phase, which was used and incorporated into either the copolymers or blended materials [ 27 , 28 , 29 ]. In addition, we can also obtain valuable information through the SE analysis, such as the thickness values of emissive films.…”

Section: Resultsmentioning

confidence: 99%

“…The degree of overlap between the absorption and PL emission peaks of the emissive materials is used to predict the energy transfer efficiency. It is possible to quantify the amount of energy transferred between the hosts and dopants by calculating the relative area of the overlap

between the residual absorption of each dopant within the wavelength range of each host’s respective PL emission in UV-Vis absorption spectra and the total area of the PL emission of the hosts

[ 29 ]. Finally, the calculated percentage is given using the following equation:

…”

Section: Resultsmentioning

confidence: 99%

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A Comparative Study between Blended Polymers and Copolymers as Emitting Layers for Single-Layer White Organic Light-Emitting Diodes

Tselekidou,

Papadopoulos,

Foris

et al. 2023

Materials

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Extensive research has been dedicated to the solution-processable white organic light-emitting diodes (WOLEDs), which can potentially influence future solid-state lighting and full-color flat-panel displays. The proposed strategy based on WOLEDs involves blending two or more emitting polymers or copolymerizing two or more emitting chromophores with different doping concentrations to produce white light emission from a single layer. Toward this direction, the development of blends was conducted using commercial blue poly(9,9-di-n-octylfluorenyl2,7-diyl) (PFO), green poly(9,9-dioctylfluorenealt-benzothiadiazole) (F8BT), and red spiro-copolymer (SPR) light-emitting materials, whereas the synthesized copolymers were based on different chromophores, namely distyryllanthracene, distyrylcarbazole, and distyrylbenzothiadiazole, as yellow, blue, and orange–red emitters, respectively. A comparative study between the two approaches was carried out to examine the main challenge for these doping systems, which is ensuring the proper balance of emissions from all the units to span the entire visible range. The emission characteristics of fabricated WOLEDs will be explored in terms of controlling the emission from each emitter, which depends on two possible mechanisms: energy transfer and carrier trapping. The aim of this work is to achieve pure white emission through the color mixing from different emitters based on different doping concentrations, as well as color stability during the device operation. According to these aspects, the WOLED devices based on the copolymers of two chromophores exhibit the most encouraging results regarding white color emission coordinates (0.28, 0.31) with a CRI value of 82.

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Section: Resultsmentioning

confidence: 99%

between the residual absorption of each dopant within the wavelength range of each host’s respective PL emission in UV-Vis absorption spectra and the total area of the PL emission of the hosts

[ 29 ]. Finally, the calculated percentage is given using the following equation:

…”

Section: Resultsmentioning

confidence: 99%

A Comparative Study between Blended Polymers and Copolymers as Emitting Layers for Single-Layer White Organic Light-Emitting Diodes

Tselekidou,

Papadopoulos,

Foris

et al. 2023

Materials

Self Cite

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“…One universal solution to the abovementioned problems to date is to disperse Ir(III) compounds in an appropriate host material. There have been many efforts focusing on the development of porous materials as promising supporting matrices for metal complexes to prolong the detection lifetimes of catalytic systems ( You et al, 2020 ; Li et al, 2022 ; Tselekidou et al, 2023 ; Wang et al, 2023 ).…”

Section: Introductionmentioning

confidence: 99%

Phosphorescent iridium (III) complex with covalent organic frameworks as scaffolds for highly selective and sensitive detection of homocysteine

Deng,

Xu,

Zhang

et al. 2024

Front. Chem.

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Introduction: Developing a convenient and cost-effective platform for detecting homocysteine (Hcy) is of great interest as Hcy has been found to be a biomarker for Alzheimer’s disease, gastric cancer, and other diseases.Methods: In this study, we synthesized five phosphorescent Ir(C∧N)2(N∧N)+ compounds (Irn, n = 1–5) with various substituents (-CHO or -CHO/-NH2), which were then doped into a covalent organic framework (COF) host via covalent bonding.Results and Discussion: The resulting optimal composites (denoted as Ir4/5@EBCOF) with -CHO/-NH2 substituents not only overcame the self-quenching issue of the bare Ir4/5 complexes but also showed rapid, highly selective, and sensitive detection of Hcy, with a limit of detection (LOD) of 0.23 μM and reaction time of 88 s. The sensing mechanism was revealed as the unique cyclization reaction between Ir(III) and Hcy that forms a six-membered ring. During the process, the color changes in the composites can be observed visually. It is expected that these phosphorescent Iridium (III) complexes with COFs will have the potential to serve as promising platforms for detecting thiols.

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New ionic iridium(III) complexes based on methoxyl-modified 1-phenylisoquinoline for solution-processed red organic light-emitting diodes

Zeng,

Jiang,

Zhou

et al. 2023

Journal of Organometallic Chemistry

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Solution-processable red phosphorescent OLEDs based on Ir(dmpq)2(acac) doped in small molecules as emitting layer

Cited by 9 publications

References 42 publications

A Comparative Study between Blended Polymers and Copolymers as Emitting Layers for Single-Layer White Organic Light-Emitting Diodes

A Comparative Study between Blended Polymers and Copolymers as Emitting Layers for Single-Layer White Organic Light-Emitting Diodes

Phosphorescent iridium (III) complex with covalent organic frameworks as scaffolds for highly selective and sensitive detection of homocysteine

New ionic iridium(III) complexes based on methoxyl-modified 1-phenylisoquinoline for solution-processed red organic light-emitting diodes

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