Are pure hydrocarbons the future of host materials for blue phosphorescent organic light-emitting diodes?

Poriel, Cyril; Rault‐Berthelot, Joëlle; Jiang, Zuo‐Quan

doi:10.1039/d2qm00083k

Cited by 17 publications

(17 citation statements)

References 61 publications

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“…The performance of white PhOLEDs compete with the best reported to date in the literature using traditional heteroatom-based hosts and show that the PHC strategy should now be carefully considered for the next generation of host materials. [68] This work proves that PHCs can act as excellent hosts for the new generation of white PhOLEDs Angewandte Chemie for lighting applications and pave the way for the development of a simpler large-scale electronics.…”

Section: Discussionmentioning

confidence: 58%

Pure Hydrocarbon Materials as Highly Efficient Host for White Phosphorescent Organic Light‐Emitting Diodes: A New Molecular Design Approach

et al. 2022

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To date, all efficient host materials reported for phosphorescent OLEDs (PhOLEDs) are constructed with heteroatoms, which have a crucial role in the device performance. However, it has been shown in recent years that the heteroatoms not only increase the design complexity but can also be involved in the instability of the PhOLED, which is nowadays the most important obstacle to overcome. Herein, we design pure aromatic hydrocarbon materials (PHC) as very efficient hosts in high-performance white and blue PhOLEDs. With EQE of 27.7 %, the PHC-based white PhOLEDs display similar efficiency as the best reported with heteroatom-based hosts. Incorporated as a host in a blue PhOLED, which are still the weakest links of the technology, a very high EQE of 25.6 % is reached, surpassing, for the first time, the barrier of 25 % for a PHC and FIrpic blue emitter. This performance shows that the PHC strategy represents an effective alternative for the future development of the OLED industry.

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Section: Discussionmentioning

confidence: 58%

Pure Hydrocarbon Materials as Highly Efficient Host for White Phosphorescent Organic Light‐Emitting Diodes: A New Molecular Design Approach

et al. 2022

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“…2 This achievement has been possible thanks to the development of hundreds of host materials for the last 20 years. [15][16][17][18][19][20] Beside molecular engineering, the architecture of the device itself is of great importance to maximize the conversion of electric energy into luminous energy. [21][22][23] In this context, the most performant PhOLEDs to date are constructed on a multi-layer (ML) stack, which insures a good injection, transport and recombination of holes and electrons in the EML.…”

Section: Introductionmentioning

confidence: 99%

“…The external quantum efficiencies (EQEs) of the most efficient PhOLEDs reported nowadays are very high, above 30%. , Green- and red-emitting devices are already part of lighting displays available on the market . This achievement has been possible, thanks to the development of hundreds of host materials for the last 20 years. − Besides molecular engineering, the architecture of the device itself is of great importance to maximize the conversion of electric energy into luminous energy. − In this context, the most performant PhOLEDs till date are constructed on a multi-layer (ML) stack, which insures a good injection, transport, and recombination of holes and electrons in the EML. ,,− Nevertheless, these devices remain complicated, and simplifying the OLED technology is an important goal to decrease the production cost and the environmental footprint. One way to reduce these two main drawbacks is to use single-layer PhOLEDs (SL-PhOLEDs), which are the simplest possible OLED .…”

Section: Introductionmentioning

confidence: 99%

Simplified Green-Emitting Single-Layer Phosphorescent Organic Light-Emitting Diodes with an External Quantum Efficiency > 22%

et al. 2022

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Nowadays, Phosphorescent Organic Light-Emitting Diodes (PhOLEDs) is a widespread technology, in which all the high-performance devices are constructed on a stack of different organic layers called multi-layer devices (ML-PhOLEDs). Thanks to these functional layers, the injection, the transport and the recombination of holes and electrons in the Emissive Layer (EML) are significantly improved allowing to reach high performances. In this technology, the ideal devices are the Single-Layer PhOLEDs (SL-PhOLEDs), with a very simple stack only constituted of the electrodes and the EML. These devices are simple, very easy to fabricate and can hence significantly decrease their costs. Nevertheless, removing the functional layers of an OLED drastically decreases the performances and there is, so far, only a few examples of high performances SL-PhOLEDs. Thus, in SL-PhOLEDs, the role of the functional layer should be done by the EML, which should allow an excellent injection, transport and recombination of holes and electrons. In this work, thanks to a rational molecular design of the EML, we report a green emitting SL-PhOLED displaying a very high external quantum efficiency of 22.7 %. The EML of this device is constructed on the barely studied Ir(ppy) 2 acac phosphor and a high efficiency host material possessing a Donor-spiro-Acceptor design. This performance is, to the best of our knowledge, the highest reported for SL-PhOLEDs (all colours considered). Through a structure/properties/device performance relationship study combining morphological (AFM), photophysical (time-resolved spectroscopy) and charge transport (SCLC) studies, we show that the EML presents all the required characteristics such as smooth surface, quick radiative deactivation and ambipolarity. In addition, the comparison with Ir(ppy) 3 , the most famous green emitter used in PhOLEDs highlights the high potential of Ir(ppy) 2 acac. The impact of the phosphorescent emitter on the ambipolarity of the charge transport is particularly evidenced.

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“…The performance of white PhOLEDs compete with the best reported to date in the literature using traditional heteroatom-based hosts and show that the PHC strategy should now be carefully considered for the next generation of host materials. [68] This work proves that PHCs can act as excellent hosts for the new generation of white PhOLEDs for lighting applications and pave the way for the development of a simpler large-scale electronics.…”

Section: Discussionmentioning

confidence: 57%

Pure Hydrocarbon Materials as Highly Efficient Host for White Phosphorescent Organic Light‐Emitting Diodes: A New Molecular Design Approach

et al. 2022

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Are pure hydrocarbons the future of host materials for blue phosphorescent organic light-emitting diodes?

Abstract: The fantastic development of phosphorescent organic light-emitting diodes (PhOLEDs) has been undoubtedly driven by the molecular design of high-efficiency host materials for red, green and blue phosphors. Fine tuning the...

Cited by 17 publications

References 61 publications

Pure Hydrocarbon Materials as Highly Efficient Host for White Phosphorescent Organic Light‐Emitting Diodes: A New Molecular Design Approach

Pure Hydrocarbon Materials as Highly Efficient Host for White Phosphorescent Organic Light‐Emitting Diodes: A New Molecular Design Approach

Simplified Green-Emitting Single-Layer Phosphorescent Organic Light-Emitting Diodes with an External Quantum Efficiency > 22%

Pure Hydrocarbon Materials as Highly Efficient Host for White Phosphorescent Organic Light‐Emitting Diodes: A New Molecular Design Approach

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