Highly efficient electroluminescence from a solution-processable thermally activated delayed fluorescence emitter

Journal Article · Mon Nov 02 00:00:00 EST 2015 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.4935237· OSTI ID:22486016

Wada, Yoshimasa; Kubo, Shosei; Suzuki, Katsuaki; Kaji, Hironori ^[1]; Shizu, Katsuyuki ^[1]; Tanaka, Hiroyuki ^[2]; Adachi, Chihaya ^[2]

---

1. Institute for Chemical Research, Kyoto University, Uji, Kyoto 611-0011 (Japan)
2. Center for Organic Photonics and Electronics Research (OPERA), Kyushu University, 744 Motooka, Nishi, Fukuoka 819-0395 (Japan)

We developed a thermally activated delayed fluorescence (TADF) emitter, 2,4,6-tris(4-(9,9-dimethylacridan-10-yl)phenyl)-1,3,5-triazine (3ACR-TRZ), suitable for use in solution-processed organic light-emitting diodes (OLEDs). When doped into 4,4′-bis(carbazol-9-yl)biphenyl (CBP) host at 16 wt. %, 3ACR-TRZ showed a high photoluminescence quantum yield of 98%. Transient photoluminescence decay measurements of the 16 wt. % 3ACR-TRZ:CBP film confirmed that 3ACR-TRZ exhibits efficient TADF with a triplet-to-light conversion efficiency of 96%. This high conversion efficiency makes 3ACR-TRZ attractive as an emitting dopant in OLEDs. Using 3ACR-TRZ as an emitter, we fabricated a solution-processed OLED exhibiting a maximum external quantum efficiency of 18.6%.

• OSTI ID: 22486016
• Journal Information: Applied Physics Letters, Vol. 107, Issue 18; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
BIPHENYL
DOPED MATERIALS
ELECTROLUMINESCENCE
FILMS
FLUORESCENCE
LIGHT EMITTING DIODES
PHOTOLUMINESCENCE
QUANTUM EFFICIENCY
VISIBLE RADIATION
YIELDS