Thermally stable efficient hole transporting materials based on carbazole and triphenylamine core for red phosphorescent OLEDs

Braveenth, Ramanaskanda; Bae, Hyeong Woo; Ko, Ik Jang; Wu, Qiong; Nguyen, Quynh Pham Bao; Jayashantha, Pothupitiya Gamage Sudesh; Kwon, Jang Hyuk; Chai, Kyu Yun

doi:10.1016/j.orgel.2017.09.050

Cited by 37 publications

(19 citation statements)

References 22 publications

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“…Also, higher T g generally improves the operational stability of the devices. [44][45][46] Thus we observed the operating temperature distribution of the QLEDs using an IR camera. The thermal images in the inset of Fig.…”

Section: Resultsmentioning

confidence: 99%

Enhanced efficiency and high temperature stability of hybrid quantum dot light-emitting diodes using molybdenum oxide doped hole transport layer

et al. 2019

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Section: Resultsmentioning

confidence: 99%

Enhanced efficiency and high temperature stability of hybrid quantum dot light-emitting diodes using molybdenum oxide doped hole transport layer

et al. 2019

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“…In the past decades, organic light-emitting diodes (OLEDs) have become increasingly irreplaceable for their excellent potential in commercial full-color flat panel displays and general lighting applications. [1][2][3][4][5] In general, traditional fluorescent OLEDs have been widely used in commercial devices due to their advantages of high color purity and long operational lifetime. However, they can only harvest excitons in the singlet state, which is equal to 25 % of all the electronically generated excitons.…”

Section: Introductionmentioning

confidence: 99%

Versatile Host Materials for Highly‐Efficient Green, Red Phosphorescent and White Organic Light‐Emitting Diodes

et al. 2019

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To build up efficient host materials, two novel organic small molecules ICz‐PPI and 2ICz‐PPI were designed and synthesized, in which phenanthro[9,10‐d]imidazole (PI) is proposed as a potential luminophore with high stability, while the indolo[3,2,1‐jk]carbazole (ICz) has a high triplet energy and excellent thermal stability. Both exhibited weak intramolecular charge transfer, high decomposition temperature (Td) and high quantum yield. ICz‐PPI and 2ICz‐PPI can act as the emitting layer in non‐doped organic light‐emitting diodes (OLEDs), which achieved an external quantum efficiency (EQE) of 2.47 and 1.94 % with CIE coordinates of (0.153, 0.121) and (0.161, 0.102), respectively. In addition, the high triplet energy allows them to be used as hosts for phosphorescent OLEDs (PhOLEDs). Accordingly, high performance for green (62.5 cd A−1, 70.9 lm W−1, 17.8 %) and red (25.7 cd A−1, 26.9 lm W−1, 19.4 %) had been achieved from the ICz‐PPI‐based PhOLED. Particularly, the ICz‐PPI‐based red PhOLED showed surprisingly low roll‐off and maintained an EQE of 14.9 % at 10 000 cd m−2. Furthermore, an ICz‐PPI‐based white OLED (WOLED) exhibited warm white light (CIEx,y=(0.427, 0.468)) and high efficiencies with a CEmax of 31.8cd A−1, PEmax of 37.0lm W−1 and EQEmax of 14.4 %.

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“…reported new hole transporting materials based on carbazole ( HTM1A and 1B ) and TPA central core ( HTM2A and 2B ). HTM2A based device IV revealed higher maximum current efficiency, better external quantum efficiency (26.7%) and higher hole mobility (5.3×10 −4 cm 2 V −1 s −1 ) than NPB based device …”

Section: Introductionmentioning

confidence: 93%

Pyrrolo[1, 2‐a]quinoxaline‐Based Bipolar Host Materials for Efficient Red Phosphorescent OLEDs

et al. 2018

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Novel bipolar host materials 4CBZ-PQ, 3CBZ-PQ and TPA-PQ based on carbazole, triphenylamine as electron donors and pyrrolo[1, 2-a]quinoxaline as an electron acceptor unit has been synthesized and characterized. Their photophysical, thermal and electrochemical properties have also been investigated. These structures show suitable frontier molecular orbital (FMO) energy levels and ensure good thermal and morphological stability. Amongst these bipolar host materials, 4CBZ-PQ showed high T g (155.7 o C) and T d (160.7 o C) as well as good triplet energy (E T ) of 2.59 eV. Hence, phosphorescent organic light-emitting diodes (PhOLEDs) were fabricated containing 4CBZ-PQ, 3CBZ-PQ and TPA-PQ as host materials. 4CBZ-PQ showed best EL performance with a turn-on voltage of 2.6 V, a maximum brightness of 100388 cd/m 2 , a maximum current efficiency of 18.1 cd/A 1 , a maximum power efficiency of 12.9 lm/W and an external quantum efficiency of 15.1%. The RBY (red, brown and yellow) three-color PhOLED with 4CBZ-PQ as the host material showed maximum external quantum efficiency of 15.1% for the red device, indicating its potential utility as a host material for highly efficient PhOLEDs. state molecular geometries and experimental section of 4CBZ-PQ, 3CBZ-PQ and TPA-PQ.

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Thermally stable efficient hole transporting materials based on carbazole and triphenylamine core for red phosphorescent OLEDs

Cited by 37 publications

References 22 publications

Enhanced efficiency and high temperature stability of hybrid quantum dot light-emitting diodes using molybdenum oxide doped hole transport layer

Enhanced efficiency and high temperature stability of hybrid quantum dot light-emitting diodes using molybdenum oxide doped hole transport layer

Versatile Host Materials for Highly‐Efficient Green, Red Phosphorescent and White Organic Light‐Emitting Diodes

Pyrrolo[1, 2‐a]quinoxaline‐Based Bipolar Host Materials for Efficient Red Phosphorescent OLEDs

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