High performance fluorescent and phosphorescent organic light-emitting diodes based on a charge-transfer-featured host material

Wang, Xu; Zhou, Jie; Zhao, Juan; Lu, Zhiyun; Yu, Junsheng

doi:10.1016/j.orgel.2015.03.006

Cited by 18 publications

(11 citation statements)

References 37 publications

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“…Therefore, besides the energy transfer from the TCTA host to these Ir(III) complexes, direct charge trapping on these Ir(III) complexes could possibly happen due to the energetically favored energy levels. 47 Actually, this had been confirmed by the dependence of current densities on the doping concentration of SOIrOPh in TCTA films (Figure S10). 46,47 Charge trapping followed by direct recombination of holes and electrons occurred on emitters can avoid the loss of energy transfer from the host to dopant and thus increase the electroluminescent efficiency.…”

Section: ■ Introductionmentioning

confidence: 68%

“…47 Actually, this had been confirmed by the dependence of current densities on the doping concentration of SOIrOPh in TCTA films (Figure S10). 46,47 Charge trapping followed by direct recombination of holes and electrons occurred on emitters can avoid the loss of energy transfer from the host to dopant and thus increase the electroluminescent efficiency. 46,55,56 The turn-on voltages of these OLEDs were in the range of 3.5−5.1 V, which were comparable to those of previously reported efficient deep-red OLEDs fabricated by the solution-processed method.…”

Section: ■ Introductionmentioning

confidence: 68%

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Highly Efficient Deep-Red Organic Light-Emitting Devices Based on Asymmetric Iridium(III) Complexes with the Thianthrene 5,5,10,10-Tetraoxide Moiety

Sun

Yang

Zhao

et al. 2019

ACS Appl. Mater. Interfaces

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Highly efficient deep-red organic light-emitting devices (OLEDs) are indispensable for developing high-performance red-green-blue (RGB) displays and white OLEDs (WOLEDs). However, the shortage of deep-red emitters with high photoluminescence quantum yields (PLQYs) and balanced charge injection/transport abilities has severely restricted the performance of deep-red OLEDs. Herein, we design and synthesize four efficient emitters by combining the isoquinoline group with the thianthrene 5,5,10,10-tetraoxide group. Benefited from the introduction of the thianthrene 5,5,10,10-tetraoxide group, these Ir(III) complexes show improved electron-injection/-transport abilities. By enhancing the contribution of the triplet metal-to-ligand charge transfer (3MLCT) in emissions, the asymmetric configuration endows the related deep-red Ir(III) complexes with high PLQYs of 0.45–0.50 in solutions. More importantly, PLQYs of these Ir(III) complexes in doped host films increase up to 0.91, which is much higher than PLQYs reported for conventional deep-red Ir(III) complexes with impressive electroluminescent performance. As a result, solution-processed OLEDs based on these Ir(III) complexes exhibit deep-red emissions with Commission Internationale de L’Eclairage (CIE x, y) coordinates very close to the National Television System Committee (NTSC)-recommended standard red CIE coordinates of (0.67, 0.33). Furthermore, a deep-red OLED using the asymmetric Ir(III) complex SOIrOPh as the emitter shows outstanding performance with a peak external quantum efficiency (EQE) of 25.8%, which is the highest EQE reported for solution-processed deep-red OLEDs. This work sheds light on the great potential of utilizing the thianthrene 5,5,10,10-tetraoxide group to develop phosphorescent emitters for highly efficient OLEDs.

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Section: ■ Introductionmentioning

confidence: 68%

Section: ■ Introductionmentioning

confidence: 68%

Highly Efficient Deep-Red Organic Light-Emitting Devices Based on Asymmetric Iridium(III) Complexes with the Thianthrene 5,5,10,10-Tetraoxide Moiety

Sun

Yang

Zhao

et al. 2019

ACS Appl. Mater. Interfaces

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“…To realize white emission, one method is by combining red, green and blue three-color emitting materials [1][2][3] and another way is by _______________________ Na Wang, Sichuan Electromechanical Institute of Vocation and Technology, Panzhihua, Sichuan, China combining yellow and blue two-color emitting materials [4][5][6]. For the emitting materials, phosphorescent materials that contain heavy metal such as Ir, Pt, Au, Cu [7][8][9][10][11] can use both 25% singlet and 75% triplet excitons and reach 100% internal quantum efficiency, as a result of the heavy metal effect. Therefore, phosphorescent OLEDs are able to achieve very high device efficiency, and great studies have been focused on phosphorescent white OLEDs.…”

Section: Introductionmentioning

confidence: 99%

Effects of an Ultra-thin Green Phosphor on White Organic Light-emitting Devices With Double Doped Emissive Layers

Wang¹

2017

dteees

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The phosphorescent white OLEDs were fabricated based on double doped emitting layers, and the effect of an ultrathin layer of non-doped green phosphor Ir(ppy) 3 which was inserted between the doped EMLs on device performance was studied. By introduction of 0.3 nm Ir(ppy) 3 , the white OLED achieved maximum current efficiency of 24.3 cd/A and power efficiency 7.2 lm/W, showing a doubled efficiency compared to the white OLED without Ir(ppy)3. The experiment shows, When Ir(ppy) 3 was added, the charge carrier was balanced and the recombination zone was broadened due to direct charge trapping effect, contributing to enhanced device performance.

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“…The fast response and wide viewing angle are also be printed over different type of substrates and this promises low cost fabrication and flexible devices [3][4][5]. Recently the main attention has been attracted on the application of metal complexes as electroluminescent materials for organic light emitting diodes (OLED) [6][7][8][9]. Organic light emitting diodes (OLEDs) are a recent area of interest for many research groups.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Characterization of a New Aluminium Complex Bis (5-choloro-8-hydroxyquinoline)(2,2’bipyridine) Aluminium Al(Bpy)(5-Clq)2

Kumar¹

2017

J. Nano- Electron. Phys.

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We have synthesized a new aluminium complex, Bis (5-choloro-8-hydroxyquinoline) (2,2'bipyridine) aluminium Al(Bpy)(5-Clq)2 and characterized it for structural, thermal and photoluminescence properties. The prepared material was characterized by Fourier-transformed infra-red spectroscopy (FTIR), thermal gravimetric analysis (TGA) and photoluminescence. The prepared material showed thermal stability up to 370 C. Absorption Spectra of the material was measured by UV-visible spectroscopy. Solution of Al(Bpy)(5-Clq)2 in ethanol showed peak at 393 nm, which may be attributed due to (- * ) transitions. The photoluminescence spectrum of Al(Bpy)(5-Clq)2 in ethanol solution showed peak at 535 nm. The time resolved photoluminescence spectra of the material showed two life time components. The decay times of the first and second component are 5.3 ns and 21.2 ns respectively. The prepared material emits the light in green region (PL spectra) so it can be used as an emissive layer in organic light emitting diodes.

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High performance fluorescent and phosphorescent organic light-emitting diodes based on a charge-transfer-featured host material

Cited by 18 publications

References 37 publications

Highly Efficient Deep-Red Organic Light-Emitting Devices Based on Asymmetric Iridium(III) Complexes with the Thianthrene 5,5,10,10-Tetraoxide Moiety

Highly Efficient Deep-Red Organic Light-Emitting Devices Based on Asymmetric Iridium(III) Complexes with the Thianthrene 5,5,10,10-Tetraoxide Moiety

Effects of an Ultra-thin Green Phosphor on White Organic Light-emitting Devices With Double Doped Emissive Layers

Synthesis and Characterization of a New Aluminium Complex Bis (5-choloro-8-hydroxyquinoline)(2,2’bipyridine) Aluminium Al(Bpy)(5-Clq)2

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