Benzophenone-imbedded benzoyltriptycene with high triplet energy for application as a universal host material in phosphorescent organic light-emitting diodes (PhOLEDs)

Samik Jhulki; Tahsin J. Chow; Jarugu Narasimha Moorthy

doi:10.1039/C6NJ00200E

Benzophenone-imbedded benzoyltriptycene with high triplet energy for application as a universal host material in phosphorescent organic light-emitting diodes (PhOLEDs)

Samik Jhulki,^a Tahsin J. Chow*^b and Jarugu Narasimha Moorthy*^a

Author affiliations

* Corresponding authors

^a Department of Chemistry, Indian Institute of Technology, Kanpur 208016, India
E-mail: moorthy@iitk.ac.in

^b Institute of Chemistry, Academia Sinica, Taipei, Republic of China
E-mail: chowtj@gate.sinica.edu.tw

Abstract

Benzoyltriptycene (TRP-BP) – accessed readily by Fridel–Crafts benzoylation reaction – represents a molecular system with an imbedded benzophenone chromophore. The concave features inherent to a triptycene scaffold impart amorphous properties, which is an important consideration in OLEDs. Due to very weak homoconjugation in TRP-BP, the high triplet energy of the parent benzophenone chromophore (ca. 2.99 eV) is conserved. This in conjunction with a high band gap (3.80 eV) permits application of TRP-BP as a universal host material for blue, green, yellow and red dopants. An external quantum efficiency of 19.8% and the brightness of 11 800 cd m⁻² were elicited from the simple devices fabricated with yellow and green dopants, namely, PO-01 and Ir(ppy)₃ respectively. Ready synthetic access and impressive device performance results make TRP-BP an important addition to the scantily explored host materials based on benzophenone, which has traditionally served as a prototype carbonyl compound in the development of organic photochemistry in general to delineate the triplet-excited state properties.

Supplementary files

Publication details

The article was received on 20 Jan 2016, accepted on 02 Jun 2016 and first published on 02 Jun 2016

Article type: Paper

DOI: 10.1039/C6NJ00200E

Citation: New J. Chem., 2016,40, 6854-6859

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Benzophenone-imbedded benzoyltriptycene with high triplet energy for application as a universal host material in phosphorescent organic light-emitting diodes (PhOLEDs)

S. Jhulki, T. J. Chow and J. N. Moorthy, New J. Chem., 2016, 40, 6854
DOI: 10.1039/C6NJ00200E
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New Journal of Chemistry

Benzophenone-imbedded benzoyltriptycene with high triplet energy for application as a universal host material in phosphorescent organic light-emitting diodes (PhOLEDs)

Abstract

Supplementary files

Publication details

Benzophenone-imbedded benzoyltriptycene with high triplet energy for application as a universal host material in phosphorescent organic light-emitting diodes (PhOLEDs)

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