TY - JOUR
T1 - Enhanced near-infrared electroluminescence from a neodymium complex in organic light-emitting diodes with a solution-processed exciplex host
AU - Shahalizad, Afshin
AU - Kim, Dae Hyeon
AU - Rao Bobbara, Sanyasi
AU - Tsuchiya, Youichi
AU - D'Aléo, Anthony
AU - Andraud, Chantal
AU - Ribierre, Jean Charles Maurice
AU - Nunzi, Jean Michel
AU - Adachi, Chihaya
N1 - Funding Information:
The research at Queen’s University was supported by the Natural Sciences and Engineering Research Council (NSERC), the Discovery Grants program (No. RGPIN-2015-05485), and the CREATE program (Novel Chiral Materials: An International Effort in Research and Education). The research at Kyushu University was supported by the Japan Science and Technology Agency (JST), ERATO, Adachi Molecular Exciton Engineering Project, under JST ERATO Grant No. JPMJER1305, Japan.
Publisher Copyright:
© 2019 Author(s).
PY - 2019/1/21
Y1 - 2019/1/21
N2 - We report enhanced near-infrared (NIR) electroluminescence from a Nd 3+ -complex with thenoyltrifluoroacetone and 1,10-phenanthroline ligands. The NIR-emitting complex was blended into an exciplex-forming co-host system comprising 2,7-bis(diphenylphosphoryl)-9,9′-spirobifluorene as the electron transport material and 4,4′,4″-tris(carbazol-9-yl)triphenylamine as the hole transport material in solution-processed small molecule organic light-emitting diodes (OLEDs). This binary ambipolar host system favors direct charge trapping and exciton formation on the Nd 3+ -complex molecules. Efficient energy transfer from the singlet and triplet exciplexes formed between the host molecules to the Nd 3+ ions contributes to the enhanced luminescence efficiency. The photoluminescence quantum yield of this blend is 1.2%, and the optimized OLED shows a maximum electroluminescence external quantum efficiency of 0.034%. The device also exhibits a low efficiency roll-off of only 12% over a current density range of 100 mA/cm 2 , due to the reduced triplet-polaron annihilation.
AB - We report enhanced near-infrared (NIR) electroluminescence from a Nd 3+ -complex with thenoyltrifluoroacetone and 1,10-phenanthroline ligands. The NIR-emitting complex was blended into an exciplex-forming co-host system comprising 2,7-bis(diphenylphosphoryl)-9,9′-spirobifluorene as the electron transport material and 4,4′,4″-tris(carbazol-9-yl)triphenylamine as the hole transport material in solution-processed small molecule organic light-emitting diodes (OLEDs). This binary ambipolar host system favors direct charge trapping and exciton formation on the Nd 3+ -complex molecules. Efficient energy transfer from the singlet and triplet exciplexes formed between the host molecules to the Nd 3+ ions contributes to the enhanced luminescence efficiency. The photoluminescence quantum yield of this blend is 1.2%, and the optimized OLED shows a maximum electroluminescence external quantum efficiency of 0.034%. The device also exhibits a low efficiency roll-off of only 12% over a current density range of 100 mA/cm 2 , due to the reduced triplet-polaron annihilation.
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U2 - 10.1063/1.5054721
DO - 10.1063/1.5054721
M3 - Article
AN - SCOPUS:85060635195
SN - 0003-6951
VL - 114
JO - Applied Physics Letters
JF - Applied Physics Letters
IS - 3
M1 - 033301
ER -