<i>m</i>‐Indolocarbazole Derivative as a Universal Host Material for RGB and White Phosphorescent OLEDs

Lai, Cheng-Chang; Huang, Min‐Jie; Chou, Ho‐Hsiu; Liao, Chung-Shou; Rajamalli, Pachaiyappan; Cheng, Chien‐Hong

doi:10.1002/adfm.201502079

Cited by 115 publications

(70 citation statements)

References 68 publications

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“…However, we will see that this angle can be modulated depending of the nature of the substituent borne by the fluorene (see part 5). In order to obtain high-efficiency PhOLEDs, a good charge balance is necessary in the host and many different building blocks have been used for this purpose such as indolocarbazole, 85 phenylacridine, 60,61,86 indoloacridine, 63 phosphine oxide, 40,53,56 pyridine, benzimidazole 68 among others. However, it has been shown that the C-C bond is significantly stronger than the C-S, C-P or C-N bonds.…”

Section: -Ph-sbfmentioning

confidence: 99%

Structure–property relationship of 4-substituted-spirobifluorenes as hosts for phosphorescent organic light emitting diodes: an overview

Poriel

Rault‐Berthelot

2017

J. Mater. Chem. C

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To cite this version:Cyril Poriel, Joëlle Rault-Berthelot. Structure-property relationship of 4-substituted-spirobifluorenes as hosts for phosphorescent organic light emitting diodes: an overview. Journal of Materials Chemistry C, Royal Society of Chemistry, 2017, 5 (16) AbstractThe aim of the present review is to report the state of the art of an emerging family of molecules, namely the 4-substituted spirobifluorenes (SBFs). The syntheses, physico-chemical and photophysical properties and applications as host in Phosphorescent Organic Light-Emitting diodes (PhOLEDs) are described through a structure-properties relationship approach. If the substitution in position 2 of a SBF core has widely been developed, the substitution in position 4 is very recent (less than that 10 years) and still need to be explored.

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Section: -Ph-sbfmentioning

confidence: 99%

Structure–property relationship of 4-substituted-spirobifluorenes as hosts for phosphorescent organic light emitting diodes: an overview

Poriel

Rault‐Berthelot

2017

J. Mater. Chem. C

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“…Remarkably, the device is highly efficient at large current densities. The energy conversion efficiency (wall-plug efficiency) of our NFPI6B MQW LED is 5.5% at 100 mA cm -2 , which is more efficient than the state-of-the-art vacuum-deposited organic LEDs at this high current density (Supplementary Table S2) [24][25][26] . The EQE histogram for 70 NFPI6B-MQW LEDs shows an average peak EQE of 8.8% and a small relative standard deviation of 11% (Fig.…”

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confidence: 93%

Perovskite light-emitting diodes based on solution-processed self-organized multiple quantum wells

et al. 2016

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Perovskite light-emitting diodes based on solution-processed self-organized multiple quantum wells, Nature Photonics, 2016. 10(11) Encouraging performance metrics of light-emitting diodes (LEDs) based on 3Dperovskites, such as low turn-on voltages and external quantum efficiencies (EQEs) of up to 3.5% at high current densities, have been demonstrated 9 . However, the EL quantum efficiency is far behind the limit predicated by ~70% PLQE of the 3D perovskites, mainly due to the existence of current losses caused by incomplete surface coverage of the perovskite films and the fact that the high PLQE can only be obtained at high excitations 8,9 . By using thick (>300 nm) perovskite films, Cho et al.obtained LEDs with over 8% EQE 10 . However, for this device, the turn-on voltage is high and the power efficiency is low, which may result from the thick perovskite layer used. In order to further enhance the performance of 3D perovskite-based LEDs, it is 3 essential to obtain perovskite thin films with both complete surface coverage and high PLQE [8][9][10] . Moreover, device stability, which was proven to be a vital issue in organic-inorganic halide perovskite-based photovoltaics 11 , has not been addressed in perovskite LEDs.The 3D perovskites are actually an extreme case of layered organometal halide perovskites with a general formula of L2(SMX3)n-1MX4, where M, X, L, and S are a divalent metal cation, a halide, and organic cations with long and short chains, respectively ( Fig. 1a) [12][13][14] . Here n is the number of semiconducting MX4 monolayer sheets within the two organic insulating layers (cation L), with n=∞ corresponding to the structure of a 3D perovskite SMX3. With smaller numbers of MX4 layers, quantum confinement effects, such as an increase in bandgap and exciton energy, become important 6,15 . In consequence, the layered perovskites naturally form quantum-well structures. At the opposite extreme, when n=1, the layered perovskites form a monolayer structure of a two-dimensional (2D) perovskite L2MX4. The 2D L2MX4 perovskites generally have good film-formation properties 13 . Nevertheless, the PLQEs of the 2D perovskites are rather low at room temperature, owing to fast exciton quenching rates 6,7 . LEDs based on the 2D perovskites have been attempted, while the devices are either very low in efficiency or only operational at cryogenic temperatures [16][17][18] . Here we demonstrate very efficient (up to 11.7% EQE) and high-brightness EL achievable at room temperature by using solution-processed perovskite multiple quantum wells (MQWs) with an energy cascade, which can combine the advantages of 2D and 3D perovskites. We note, a relevant perovskite LED work 19 which shows a peak EQE of 8.8% has been published online during the revision of this paper.A precursor solution of 1-naphthylmethylamine iodide (NMAI), formamidinium iodide (FAI), and PbI2 with a molar ratio of 2:1:2 dissolved in N,N-dimethylformamide (DMF) was used to deposit perovskite films (see Methods for details), which are abbreviated as NFPI...

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“…In this case, independent display pixels responsible for different color outputs can be fabricated with an analogous or even identical configuration, and single or multiple EMLs of lighting diodes can also be assembled expediently. However, to date, very few high-performance universal host materials for monochrome and white OLEDs are available in the literature 17–19. The scarcity of efficient universal hosts should be ascribed to the diverse requirements of multiple phosphorescent dopants, such as different frontier orbital levels, molecular polarities and host–guest interactions.…”

Section: Introductionmentioning

confidence: 99%

De novodesign of D–σ–A molecules as universal hosts for monochrome and white phosphorescent organic light-emitting diodes

et al. 2018

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m‐Indolocarbazole Derivative as a Universal Host Material for RGB and White Phosphorescent OLEDs

Cited by 115 publications

References 68 publications

Structure–property relationship of 4-substituted-spirobifluorenes as hosts for phosphorescent organic light emitting diodes: an overview

Structure–property relationship of 4-substituted-spirobifluorenes as hosts for phosphorescent organic light emitting diodes: an overview

Perovskite light-emitting diodes based on solution-processed self-organized multiple quantum wells

De novodesign of D–σ–A molecules as universal hosts for monochrome and white phosphorescent organic light-emitting diodes

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