A multifunctional bipolar host material based on phenanthroimidazole for efficient green and red PhOLEDs with low turn-on voltage

Chen, Xiang; Zhuang, Xuming; Wang, Zhongyi; Zhu, Jie-Ji; Tang, Shan-Shun; Zheng, Xu‐Hui; Liu, Yu; Tong, Qing‐Xiao

doi:10.1016/j.orgel.2019.03.013

Cited by 22 publications

(5 citation statements)

References 39 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Moreover, there are only 24nm and 28 nm redshift observed in the solid thin film when compared with that in solution for ICz-PPI and 2ICz-PPI, showing the π-π* interaction in solid state is effectively suppressed by the rigidly twisted molecular structure. [29] By testing the phosphorescence spectrum at 77 K, the triplet energy of ICz-PPI and 2ICz-PPI were measured to be 2.48 eV and 2.80 eV, which are appropriate for sensitizing phosphorescent dopants with low E T . [14] Compared with ICz-PPI, one more ICz group that connected to N1-positions of PI in 2ICz-PPI helped to enhance the triplet energy, however, it also reduced the PLQY, which was an element to decrease device performance.…”

Section: Photophysical Propertiesmentioning

confidence: 99%

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

et al. 2019

Self Cite

View full text Add to dashboard Cite

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 %.

show abstract

Section: Photophysical Propertiesmentioning

confidence: 99%

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

et al. 2019

Self Cite

View full text Add to dashboard Cite

show abstract

“…Compared to CPT-SS-FL where the HOMO and LUMO electron densities are nearly fully separated in space, this frontier molecular orbital property of FL leads to effective electron exchange, and the seeming overlap is more likely to make it an efficient fluorescence emitter. 48…”

Section: Resultsmentioning

confidence: 99%

GSH-activatable camptothecin prodrug-loaded gold nanostars coated with hyaluronic acid for targeted breast cancer therapy via multiple radiosensitization strategies

Hou,

Sun,

et al. 2023

J. Mater. Chem. B

View full text Add to dashboard Cite

show abstract

“…Phosphorescent organic light‐emitting diodes (PhOLEDs) have attracted intense attention owing to their theoretical 100% internal quantum efficiency through simultaneously utilizing singlet and triplet excitons . With the tremendous efforts over the past few decades, the thermal‐evaporated electrophosphorescence devices with excellent external quantum efficiencies (EQEs) and operation lifetimes have been achieved . Nevertheless, the development of high‐efficiencies blue PhOLEDs remains as a daunting and forbidden challenge although blue emission is indispensable to improve color rendering index and color gamuts .…”

Section: Device Performances Of Dczsi and Dsidczsi Hosted Blue Pholedsmentioning

confidence: 99%

Multiple σ–π Conjugated Molecules with Selectively Enhanced Electrical Performance for Efficient Solution‐Processed Blue Electrophosphorescence

Zhi

et al. 2019

Advanced Optical Materials

View full text Add to dashboard Cite

Phosphorescent organic light-emitting diodes (PhOLEDs) have attracted intense attention owing to their theoretical 100% internal quantum efficiency through simultaneously utilizing singlet and triplet excitons. [1] With the tremendous efforts over the past few decades, the thermalevaporated electrophosphorescence devices with excellent external quantum efficiencies (EQEs) and operation lifetimes have been achieved. [2][3][4][5][6] Nevertheless, the development of high-efficiencies blue PhOLEDs remains as a daunting and forbidden challenge although blue emission is indispensable to improve color rendering index and color gamuts. [7][8][9][10][11][12] Moreover, the vacuum-deposited PhOLEDs require complicated technological processes and precisely controlling of concentrations of different materials in emission layer (EML) for realizing high device performance, which leads to relatively high fabrication costs. Solution-processed PhOLEDs based on spin-coating, blade coating and/or inkjet printing have been introduced with insistence because of their ultimate potential in facilitating largearea, low-cost, and high-efficiency flat-panel display as well as lighting products. [13,14] However, it is still quite difficult to develop solution-processed organic semiconductors simultaneously with the characteristics of good-solubility, large bandgap, and good carrier transportation for high-performance solutionprocessed blue PhOLEDs, which are fundamentally important for next-generation lighting sources and displays technologies.Commonly, the host-dopant systems are generally adopted to controllably eliminate the triplet-involved quench effects of emissive phosphors in the PhOLEDs. [15] The basic metrics of solution-processed hosts are excellent electrical property for endowing efficient and balanced carrier injection and flux, and high triplet energy (E T ) levels for maintaining exothermic energy migration from the hosts to dopants and confining the triplet excitons in EML. [16,17] Furthermore, additional requirements of hosts have to be simultaneously fulfilled to support high-efficiency solution-processed PhOLEDs: [18,19] i) good solubility in common organic solvent to fabricate stable, uniform and pin-hole free films, ii) high thermal and chemical stability to endow high temperature thermal annealing for eliminating Selectively and controllably regulating molecular functions of organic optoelectronic materials with high solubility for solution-processible devices is highly desired but remains as one of the most significant challenges in material science. Here, a concise molecular design strategy is reported to achieve effective electronic communications using efficient d-orbital participated σ-π conjugations between Si and π unit for purposely modulating the electrical properties of organic optoelectronic materials. Through a two-step reaction in high yield, DSiDCzSi with the enhanced σ-π conjugation is facilely constructed by introducing multiple triphenylsilanes into carbazole unit. Impressively, DSiD-CzSi demonstrates...

show abstract

A multifunctional bipolar host material based on phenanthroimidazole for efficient green and red PhOLEDs with low turn-on voltage

Cited by 22 publications

References 39 publications

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

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

GSH-activatable camptothecin prodrug-loaded gold nanostars coated with hyaluronic acid for targeted breast cancer therapy via multiple radiosensitization strategies

Multiple σ–π Conjugated Molecules with Selectively Enhanced Electrical Performance for Efficient Solution‐Processed Blue Electrophosphorescence

Contact Info

Product

Resources

About