Ultralow dark current density of organic photodetectors and organic light-emitting diodes endowed by highly thermally stable derivatives of 2,7-Di-tert-butyl-9,9-dimethyl-9,10-dihydroacridine and phenanthroimidazole exhibiting balanced bipolar charge transport /

Rita Butkute; Ausrine Masiulyte; Ehsan Ullah Rashid; Svetlana Sargsyan; Neelalohith Satish Moudgalya; Karolis Leitonas; Dmytro Volyniuk; Juozas V Grazulevicius

doi:10.1021/acsaelm.4c00746

Title	Ultralow dark current density of organic photodetectors and organic light-emitting diodes endowed by highly thermally stable derivatives of 2,7-Di-tert-butyl-9,9-dimethyl-9,10-dihydroacridine and phenanthroimidazole exhibiting balanced bipolar charge transport /
Authors	Butkute, Rita ; Masiulyte, Ausrine ; Rashid, Ehsan Ullah ; Sargsyan, Svetlana ; Moudgalya, Neelalohith Satish ; Leitonas, Karolis ; Volyniuk, Dmytro ; Grazulevicius, Juozas V
DOI	10.1021/acsaelm.4c00746
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Is Part of	ACS Applied electronic materials.. Washington : American Chemical Society. 2024, vol. 6, iss. 6, p. 4735-4745.. eISSN 2637-6113
Keywords [eng]	acridine ; bipolar charge transport ; organic light-emitting diode ; organic photodetector ; organic semiconductor ; phenanthroimidazole
Abstract [eng]	Seeking to develop more advanced organic photodetectors (OPDs) and organic light-emitting diodes (OLEDs), we designed three derivatives of 2,7-di-tert-butyl-9,9-dimethyl-9,10-dihydroacridine and phenanthroimidazole with either −CF3 or −C(CH3)3 groups. These compounds were synthesized by Buchwald-Hartwig amination reaction with yields of up to 77%. They show high glass transition temperatures above 200 °C and balanced electron and hole transport with mobilities of up to 10-3 cm2/V·s under strong electric fields. One compound with −C(CH3)3 groups outperformed the standard host material in the OLED, which showed 17% higher external quantum efficiency. The low dark current density resulted in enhanced efficiency of OLEDs due to minimal charge leakage. Compared to the commercial material 1,1-bis[(di-4-tolylamino)phenyl]cyclohexane (TAPC), this compound allowed achieving superior photosensitivity in OPDs. The photocurrent to dark current density ratio at a reverse voltage of −10 V was found to be 6000. For TAPC-based OPDs, this ratio was only 43.3. The dark current density was significantly reduced to 4.5 × 10-7 mA·cm-2, compared to 3 × 10-4 mA·cm-2 for TAPC-based OPDs at the same reverse voltage, thus enhancing the photosensitivity of the OPDs.
Published	Washington : American Chemical Society
Type	Journal article
Language	English
Publication date	2024
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„Ultralow dark current density of organic photodetectors and organic light-emitting diodes endowed by highly thermally stable derivatives of 2,7-Di-tert-butyl-9,9-dimethyl-9,10-dihydroacridine and phenanthroimidazole exhibiting balanced bipolar charge transport /“