Efficient deep blue OLEDs with extremely low efficiency roll-off at high brightness based on phenanthroimidazole derivatives

Chen, Xiang; Zhao, Juewen; Zheng, Xu‐Hui; Zhu, Jie-Ji; Yang, Guangsai; Tang, Shan-Shun; Tong, Qing‐Xiao

doi:10.1016/j.cclet.2019.09.013

Cited by 15 publications

(3 citation statements)

References 27 publications

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“…The donor could compensate the large hole-injection barriers at the hole-transporter/emitter junction and hence balance the carrier injection in devices [ 10 , 11 , 12 , 13 , 14 ]. Additionally, a suitable p-conjugation bridge could weaken the undesired intramolecular charge transfer (ICT) between the donor and accepter and hence avoid the bathochromic shift of the emission [ 15 ].…”

Section: Introductionmentioning

confidence: 99%

Non-Doped Deep-Blue OLEDs Based on Carbazole-π-Imidazole Derivatives

Xiao

2021

Materials

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In this work, we designed and synthesized four bipolar blue-emitting materials with carbazole, imidazole, and biphenyl as donor, acceptor, and p bridge, respectively. The twisted phenylimidazole acceptor leads to a wider band-gap and hence deeper blue emission than the conjugated phenanthrimidazole acceptor. For the substituents on the carbazole donor, the t-butyl group could prevent the intramolecular charge transfer (ICT) process more effectively than the methoxy group. A non-doped deep-blue organic light-emitting diodes (OLED) is obtained with CIE coordinates of (0.159, 0.080), a maximum luminance of 11,364 cd/m2, and a maximum EQE of 4.43%.

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Section: Introductionmentioning

confidence: 99%

Non-Doped Deep-Blue OLEDs Based on Carbazole-π-Imidazole Derivatives

Xiao

2021

Materials

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“…In contrast, conventional fluorescent emitters are still highly favored in commercial OLEDs due to their good operational stability and acceptable efficiency. 29–34 Among these emitters, pyrene derivatives have been extensively studied and used as emitters in blue fluorescent OLEDs (F-OLEDs), which are known as the host to boost device efficiency through the triplet–triplet annihilation (TTA) process. 35–37 Although some works have achieved improved device lifetime and efficiency in blue F-OLEDs, there is still room for enhancing their color purity to meet the real demands of the electronic device market.…”

Section: Introductionmentioning

confidence: 99%

Reducing intersystem crossing rates of boron emitters for high-efficiency and long-lifetime deep-blue OLEDs

Bai,

Li,

Tan

et al. 2023

J. Mater. Chem. C

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“…[1][2][3][4][5][6] Compared to traditional lightemitting diodes, OLEDs have their unique advantages, such as light-weight, fast response, flexibility and so on. [7][8][9] Blue materials, which are among the three primary colors, can serve as the host to generate other different color lights (even white lights) by transferring energy to dopants and indeed play a significant role in reducing power consumption. [10][11][12][13][14] Achieving full internal quantum efficiency (IQE) with 100 % exciton utilization efficiency (EUE) is the continuous pursuit for blue fluorophores.…”

Section: Introductionmentioning

confidence: 99%

Constructing Highly Efficient Blue OLEDs with External Quantum Efficiencies up to 7.5 % Based on Anthracene Derivatives

Zheng

Huang

Yang

et al. 2021

Chemistry A European J

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Acquiring desirable device performance with deepblue color purity that fulfills practical application requirements is still a challenge. Bipolar fluorescent emitters with hybrid local and charge transfer (HLCT) state may serve to address this issue. Herein, by inserting anthracene core in the deep-blue building blocks, the authors successfully developed two highly twisted D-π-A fluorescent emitters, ICz-An-PPI and IP-An-PPI, featuring different acceptor groups. Both exhibited superb thermal stabilities, high photo luminescent quantum yields and excellent bipolar transport capabilities. The nondoped OLEDs using ICz-An-PPI and IP-An-PPI as the emitting layers showed efficient blue emission with an external quantum efficiency (EQE max ) of 4.32 % and 5.41 %, and the CIE coordinates of (0.147, 0.180) and (0.149, 0.150), respectively. In addition, the deep blue doped device based on ICz-An-PPI was achieved with an excellent CE max of 5.83 cd A À 1 , EQE max of 4.6 % and the CIE coordinate of (0.148, 0.078), which is extremely close to the National Television Standards Committee (NTSC) standard. Particularly, IP-An-PPI-based doped device had better performance, with an EQE max of 7.51 % and the CIE coordinate of (0.150, 0.118), which was very impressive among the recently reported deep-blue OLEDs with the CIE y < 0.12. Such high performance may be attributed to the hot exciton HLCT mechanism via T 7 to S 2 . Our work may provide a new approach for designing high-efficiency deepblue materials.

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Efficient deep blue OLEDs with extremely low efficiency roll-off at high brightness based on phenanthroimidazole derivatives

Cited by 15 publications

References 27 publications

Non-Doped Deep-Blue OLEDs Based on Carbazole-π-Imidazole Derivatives

Non-Doped Deep-Blue OLEDs Based on Carbazole-π-Imidazole Derivatives

Reducing intersystem crossing rates of boron emitters for high-efficiency and long-lifetime deep-blue OLEDs

Constructing Highly Efficient Blue OLEDs with External Quantum Efficiencies up to 7.5 % Based on Anthracene Derivatives

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