Achieving pure yellow, high-efficiency (EQE &gt; 20%) electroluminescence from ultrathin emitting layer (0.6–2.0 nm) OLEDs having a rare aggregation-free heteroleptic platinum complex

Kidanu, Hagos Tesfay; Chen, Chin‐Ti

doi:10.1039/d0tc04958a

Cited by 10 publications

(7 citation statements)

References 37 publications

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“…In contrast, the emission bands of 4a / 4b in PMMA narrowed and were blue-shifted relative to the emission from the neat solid state. Moreover, all four complexes exhibited relatively broad and featureless emission bands in solutions, indicative of enhanced charge-transfer (CT) and reduced ligand-centered (LC) character . Similarly, these complexes showed structureless emission profiles in the solid state, further suggesting charge-transfer based emission.…”

Section: Resultssupporting

confidence: 86%

Deep Blue Phosphorescence from Platinum Complexes Featuring Cyclometalated N-Pyridyl Carbazole Ligands with Monocarborane Clusters (CB₁₁H₁₂^–)

et al. 2022

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The utilization of deep blue phosphorescent materials in high-performance displays and solid-state lighting requires high quantum efficiencies and color purities. Here, we describe the preparation and luminescent properties of novel platinum triplet emitters featuring cyclometalated N-pyridyl-carbazole ligands functionalized with closo-monocarborane clusters [CB 11 H 12 ] − . All reported complexes were fully characterized by using standard small molecule techniques (UV−vis, cyclic voltammetry, nuclear magnetic resonance (NMR), high-resolution mass spectrometry (HRMS)), and their solid-state structures were elucidated by X-ray diffraction. These platinum phosphors emit in the blue region of the visible wavelength spectrum in both the solid and solution states. Complex 4a exhibits the highest luminous efficiency at λ em = 439 nm with a photoluminescent quantum yield (PLQY) of 60% by dispersing in a PMMA matrix. Electrochemical and computational studies of complexes 4a and 4b revealed that the blue phosphorescence originates mainly from intraligand 3 π → π* ( 3 ILCT) transitions with relatively small 3 MLCT mixing. A deep-blue OLED containing 4a as the light-emitting dopant was successfully fabricated using a solution-processed method, and the device exhibited blue photoluminescence with CIE coordinates of (0.17, 0.15) and a maximum external quantum efficiency (EQE max ) value of 6.2%. This article represents the pioneering study of a deep blue PhOLED using a Pt complex bearing a closo-monocarborane anion substituent, providing a new avenue into the preparation of novel triplet emitters based on boron-rich cluster anions.

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Section: Resultssupporting

confidence: 86%

Deep Blue Phosphorescence from Platinum Complexes Featuring Cyclometalated N-Pyridyl Carbazole Ligands with Monocarborane Clusters (CB₁₁H₁₂^–)

et al. 2022

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“…UEN-based yellow and orange OLEDs also were used to examine the EL performance of newly developed emitting materials. For example, in 2021, Kidanu et al used a newly proposed platinum complex, called FBNNND, to develop high-performance orange OLEDs and achieved pure yellow emission at the FBNNND thickness of 0.6 nm with a maximum EQE of 20.2% [65].…”

Section: Uen-based Yellow/orange Oledsmentioning

confidence: 99%

“…The current density of CBP devices without exciplex formation decreased significantly with increasing Rubrene thickness, suggesting that the main emission mechanism of the devices was charge trapping.UEN-based yellow and orange OLEDs also were used to examine the EL performance of newly developed emitting materials. For example, in 2021, Kidanu et al used a newly proposed platinum complex, called FBNNND, to develop high-performance orange OLEDs and achieved pure yellow emission at the FBNNND thickness of 0.6 nm with a maximum EQE of 20.2%[65].…”

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Organic Light-Emitting Diodes with Ultrathin Emitting Nanolayers

et al. 2023

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Organic light-emitting diodes (OLEDs) are promising for displays and lighting technologies because of their excellent advantages, such as high efficiency, high luminance, low power consumption, light weight, and flexibility. In recent years, ultrathin emitting nanolayers (UENs) have been used to develop OLEDs without the doping technique, which can simplify device structure, reduce material loss, achieve good exciton utilization, and realize comparable performance to doped devices such as the external quantum efficiency of 28.16%, current efficiency of 63.84 cd/A, and power efficiency of 76.70 Lm/W for white OLEDs. In this review, we comprehensively summarize the recent progress in the field of UEN-based OLEDs. Firstly, the host–guest-doped OLEDs and doping-free UEN-based OLEDs are compared. Then, various effective approaches for designing UEN-based OLEDs are presented, including both monochromatic and white devices. In particular, the properties of materials, the design of device structures, and the main working mechanisms of UEN-based OLEDs are highlighted. Finally, an outlook on the future development of UEN-based OLEDs is provided.

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“…Experimental results indicate that precise control of the UEML thickness can be achieved by monitoring a calibrated quartz crystal sensor connected to a quartz crystal vibration probe outside the vacuum chamber. Due to the intrinsic properties of sub-monolayers, introducing a UEML with a thickness of less than 1 nm does not significantly impact the charge carrier behavior of the device [10]. Furthermore, a UEML represents a particular doping emitter without conventional doping processes, making it a potential replacement for traditionally doped EMLs.…”

Section: Introductionmentioning

confidence: 99%

Progress in Research on White Organic Light-Emitting Diodes Based on Ultrathin Emitting Layers

Zhao,

Hu,

Kong

et al. 2024

Micromachines

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White organic light-emitting diodes (WOLEDs) hold vast prospects in the fields of next-generation displays and solid-state lighting. Ultrathin emitting layers (UEMLs) have become a research hotspot because of their unique advantage. On the basis of simplifying the device structure and preparation process, they can achieve electroluminescent performance comparable to that of doped devices. In this review, we first discuss the working principles and advantages of WOLEDs based on UEML architecture, which can achieve low cost and more flexibility by simplifying the device structure and preparation process. Subsequently, the successful applications of doping and non-doping technologies in fluorescent, phosphorescent, and hybrid WOLEDs combined with UEMLs are discussed, and the operation mechanisms of these WOLEDs are emphasized briefly. We firmly believe that this article will bring new hope for the development of UEML-based WOLEDs in the future.

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Achieving pure yellow, high-efficiency (EQE > 20%) electroluminescence from ultrathin emitting layer (0.6–2.0 nm) OLEDs having a rare aggregation-free heteroleptic platinum complex

Abstract: A novel platinum complex FBNNND shows rare non-aggregation in solid state and hence the same emission color both in solution and in solid state, which is drastically different from that of FPtOPhND, a classical platinum complex.

Cited by 10 publications

References 37 publications

Deep Blue Phosphorescence from Platinum Complexes Featuring Cyclometalated N-Pyridyl Carbazole Ligands with Monocarborane Clusters (CB₁₁H₁₂^–)

Deep Blue Phosphorescence from Platinum Complexes Featuring Cyclometalated N-Pyridyl Carbazole Ligands with Monocarborane Clusters (CB₁₁H₁₂^–)

Organic Light-Emitting Diodes with Ultrathin Emitting Nanolayers

Progress in Research on White Organic Light-Emitting Diodes Based on Ultrathin Emitting Layers

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Achieving pure yellow, high-efficiency (EQE > 20%) electroluminescence from ultrathin emitting layer (0.6–2.0 nm) OLEDs having a rare aggregation-free heteroleptic platinum complex

Abstract: A novel platinum complex FBNNND shows rare non-aggregation in solid state and hence the same emission color both in solution and in solid state, which is drastically different from that of FPtOPhND, a classical platinum complex.

Cited by 10 publications

References 37 publications

Deep Blue Phosphorescence from Platinum Complexes Featuring Cyclometalated N-Pyridyl Carbazole Ligands with Monocarborane Clusters (CB11H12–)

Deep Blue Phosphorescence from Platinum Complexes Featuring Cyclometalated N-Pyridyl Carbazole Ligands with Monocarborane Clusters (CB11H12–)

Organic Light-Emitting Diodes with Ultrathin Emitting Nanolayers

Progress in Research on White Organic Light-Emitting Diodes Based on Ultrathin Emitting Layers

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Product

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Deep Blue Phosphorescence from Platinum Complexes Featuring Cyclometalated N-Pyridyl Carbazole Ligands with Monocarborane Clusters (CB₁₁H₁₂^–)

Deep Blue Phosphorescence from Platinum Complexes Featuring Cyclometalated N-Pyridyl Carbazole Ligands with Monocarborane Clusters (CB₁₁H₁₂^–)