| Title |
Exploring phenothiazine and its derivatives: htms for efficient doping free fluorescent and multiple-resonance TADF OLEDS |
| Authors |
Ghasemi, Melika ; Gavale, Ramakant ; Khan, Faizal ; Volyniuk, Dmytro ; Grazulevicius, Juozas Vidas ; Misra, Rajneesh |
| DOI |
10.15388/Proceedings.2024.46 |
| ISBN |
9786090710517 |
| Full Text |
|
| Is Part of |
Open readings 2024: the 67th international conference for students of physics and natural sciences: book of abstracts / editors: M. Keršys, R. Naina, V. Adomaitis, E. Maskvytis.. Vilnius : Vilnius University Press, 2024. p. 174.. ISBN 9786090710517 |
| Abstract [eng] |
According to spin statistics, by electronic excitation singlet and triplet excitons are theoretically generated in a 1:3 ratio, where triplet excitons are lost as heat and only singlet excitons are converted into photons, utilizing 25% of the exciton generation factor, leading to an external quantum efficiency (EQE) of about 5%- 7.5% in devices. In organic light-emitting diodes (OLEDs), obtaining an efficient and stable fluorescent with high quantum efficiency is very desirable [1–3]. A series of novel metal-free organic compounds featuring phenothiazine and Tetraphenylethylene moieties were meticulously designed, synthesized, and characterized for their potential as blue/green emitters and hole transporting layers (HTLs) for OLEDs. The impact of donor moiety presence and absence on the device efficiencies were investigated. The photophysical studies revealed that all the compounds exhibit fluorescence, photoluminescence quantum yield of up to 39.64%, good thermal stability and hole transporting capabilities (1.56 × 104 cm2/Vs and 1.27 × 104 cm2/Vs at 5× 105 V/cm electric field) (Fig. 1b), all suitable for OLED applications. The compounds were tested as the emissive layer in doping free fluorescent devices obtaining EQE of 4.33% with a turn on voltage of 3.60V (Fig. 1a). The compounds were also used as HTL in multiple-resonance thermally activated OLEDs, resulting in EQE up to 7.45% and low turn on voltage of 4.60V (Fig. 1c). [...]. |
| Published |
Vilnius : Vilnius University Press, 2024 |
| Type |
Conference paper |
| Language |
English |
| Publication date |
2024 |
| CC license |
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