Pure hydrocarbon host materials based on spirofluorene with excellent performances for green phosphorescent light-emitting devices

Tian, Guojian; Jiang, Yongxin; Wu, Panpan; Huang, Jinhai; Zou, Qi; Wang, Qiaochun; Mu, Hai‐Bao; Su, Jianhua

doi:10.1039/c6nj01872f

Cited by 9 publications

(13 citation statements)

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“…Many different phenyl and/or fluorene assemblies have been constructed using the electronic decoupling characteristic induced by the meta linkage. 34,37,[47][48][49][50] Note that another efficientconjugated breaker has also been used in these designs, namely the carbon bridge of the fluorene, which has been interestingly developed in several designs, such as in constructing the next generation of high performance PHC hosts (Figure 6). 52 It was an important step in the field.…”

Section: -Conjugation Disruption: a Tool To Increase The E Tmentioning

confidence: 99%

“…Other examples of high E T materials constructed on an ortho linkage have been published by other groups showing the efficiency of this molecular design strategy. 37 However, the device characteristics using 13 as host were rather modest for a green PhOLED (EQE = 13.3%) and improving the device performance remained the major issue. The modification of the linkage (ortho to meta) has been one of the key to the success.…”

Section: Advancesmentioning

confidence: 99%

“…allowing to maintain a high E T 34,37,47,51. Thus, since the first PHC host 17 for blue (FIr6) PhOLED published in 2009, 34 many research groups worldwide have tried to improve the performance of blue PhOLEDs, reaching 15.7% in 2015 with 18:FIrpic as EML.However, the performance of PHC-based blue PhOLEDs, has remained lower than 16% until 2015 when two SBF dimers, 19 and 20, have shown the crucial importance of the meta-linkage for…”

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confidence: 99%

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Pure Hydrocarbons: An Efficient Molecular Design Strategy for the Next Generation of Host Materials for Phosphorescent Organic Light-Emitting Diodes

Poriel

Rault‐Berthelot

2022

Acc. Mater. Res.

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Fantastic progresses have been made since the discovery of phosphorescent organic light-emitting diodes (PhOLEDs) in 1998. 1 In the emissive layer of a PhOLED, a heavy-metal complex (emitter) is dispersed as a guest in an organic semiconductor (host) in order to harvest both singlet and triplet excitons. This host / guest technique is essential to reach high performance PhOLEDs. Undoubtedly, designing high-efficiency host materials for red, green and blue phosphors has been the main driving force of the field. Nowadays, the most efficient PhOLEDs report very high External Quantum Efficiency (EQE) above 27% for the three colours. The molecular design of these high-efficiency host materials is based on small functional units, which have a crucial role in the device performance. These functional units are constructed on the assembly of electron-rich and / or electron-poor molecular fragments (such as carbazole, phenylamine, phosphine oxide, oxadiazole, pyridine, sulfone etc), which allows to finely tune the molecular orbitals energy levels (HOMO and LUMO) and the mobility of the charge carriers (hole and electrons). However, these molecular fragments incorporate heteroatoms, which in turn increase the molecular design complexity and production cost of the target materials and also create potential instability in the device. Indeed, the fragile C-N, C-P and C-S bonds of such heteroatoms-based hosts are involved, in part, in the OLED instability. As the instability of OLEDs is one of the most important problem to address at the current stage of development, developing new generations of host materials, without heteroatoms, has appeared as an important challenge in the field. In recent years, this new generation of host materials, called Pure HydroCarbons (PHC), only incorporating carbon and hydrogen atoms has drawn the attention of the scientific community. PHC host materials only contain benzene rings, one of the most robust and inert building unit, which are assemble with suitable linkages to adjust their energy levels. However, reaching high performance PhOLEDs with PHC-based hosts has been a real challenge. In the present account, thanks to a structure-properties relationship study, we recount the history of PHC-based host materials for PhOLEDs from the first example published in 2005, 2 to the recent advances, which have shown that PHC hosts can overpass the performance of heteroatoms-based hosts. 3 Our group has contributed over the years to unravel the design principles of PHC hosts in order to improve the devices performance. In the light of recent results, PHC hosts now enter a new era and this work shows that the PHC design strategy is promising for the future development of OLED industry as a high-performance and lowcost option.

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Section: -Conjugation Disruption: a Tool To Increase The E Tmentioning

confidence: 99%

Section: Advancesmentioning

confidence: 99%

mentioning

confidence: 99%

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Pure Hydrocarbons: An Efficient Molecular Design Strategy for the Next Generation of Host Materials for Phosphorescent Organic Light-Emitting Diodes

Poriel

Rault‐Berthelot

2022

Acc. Mater. Res.

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“…Many PHC hosts materials were then synthesised with the meta linkage as key caracteristic. [39][40][41][42][43][44][45][46] Despite the PhOLED performances were not always very high (EQE of blue PhOLED below 16%), all these works have significantly contributed to the development of PHC hosts and have undoubtedly opened the way to the high performance reported nowadays. In 2015, Jiang, Liao and their coworkers have reported the first PHC-based blue PhOLEDs (1) with an EQE above 20%, clearly opening new perspectives for this class of materials.…”

Section: So How Phcs Have Became Efficient Host Materials In Pholeds ...mentioning

confidence: 99%

“…Many PHC host materials were then synthesised with the meta linkage as a key caracteristic. [39][40][41][42][43][44][45][46] Despite the PhOLED performances not always being very high (EQE of blue PhOLED below 16%), all these works have Chart 1 Selected examples of state of the art heteroatom-based host materials. [4][5][6][7][8][9][10] This journal is © The Royal Society of Chemistry and the Chinese Chemical Society 2022 significantly contributed to the development of PHC hosts and have undoubtedly opened the way to the high performance reported nowadays.…”

Section: Introductionmentioning

confidence: 99%

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

Poriel

Rault‐Berthelot

Jiang

2022

Mater. Chem. Front.

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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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Pure hydrocarbon host materials based on spirofluorene with excellent performances for green phosphorescent light-emitting devices

Abstract: Four novel pure hydrocarbon spirofluorene-based compounds were fully investigated for green electrophosphorescent devices.

Cited by 9 publications

References 50 publications

Pure Hydrocarbons: An Efficient Molecular Design Strategy for the Next Generation of Host Materials for Phosphorescent Organic Light-Emitting Diodes

Pure Hydrocarbons: An Efficient Molecular Design Strategy for the Next Generation of Host Materials for Phosphorescent Organic Light-Emitting Diodes

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

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

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