Bright Deep Blue TADF OLEDs: The Role of Triphenylphosphine Oxide in NPB/TPBi:PPh3O Exciplex Emission

Hippola, Chamika; Danilovic, Dusan; Bhattacharjee, Ujjal; Perez‐Bolivar, Cesar; Sachinthani, K. A. Niradha; Nelson, Toby L.; Anzenbacher, Pavel; Petrich, Jacob W.; Shinar, Ruth; Shinar, Joseph

doi:10.1002/adom.201901282

Bright Deep Blue TADF OLEDs: The Role of Triphenylphosphine Oxide in NPB/TPBi:PPh₃O Exciplex Emission

Journal Article · Tue Nov 12 23:00:00 EST 2019 · Advanced Optical Materials

DOI:https://doi.org/10.1002/adom.201901282· OSTI ID:1575203

Hippola, Chamika ^[1]; Danilovic, Dusan ^[1]; Bhattacharjee, Ujjal ^[1]; Perez‐Bolivar, Cesar ^[2]; Sachinthani, K. A. Niradha ^[3]; Nelson, Toby L. ^[3]; Anzenbacher, Pavel ^[2]; Petrich, Jacob W. ^[1]; Shinar, Ruth ^[4]; ^[1]

Ames Lab., and Iowa State Univ., Ames, IA (United States)
Bowling Green State Univ., Bowling Green, OH (United States)
Oklahoma State Univ., Stillwater, OK (United States)
Iowa State Univ., Ames, IA (United States)

Very bright (≈14 000 cd m^–2) deep blue exciplex organic light emitting diodes (OLEDs) peaking at ≈435 nm, where the photopic response is ≈0.033, and with CIE color coordinates (0.1525, 0.0820), are described. The OLED properties are interestingly linked to PPh₃O (triphenylphosphine oxide) and attributes of the emitting layer (EML) comprising NPB interfacing host:guest TPBi:PPh₃O 5:1 weight ratio. A neat PPh₃O layer that is central for device performance follows the EML (NPB/TPBi:PPh3O 5:1/PPh₃O). The bright electroluminescence originates from NPB/TPBi:PPh₃O exciplexes involving triplets via thermally activated delayed fluorescence, as evident from the strong quenching of the photoluminescence (PL) by oxygen and interestingly, the monomolecular emission process. The transient PL decay times of a NPB/TPBi:PPh₃O 5:1/PPh₃O film are 43 ns in air versus 136, 610, and weak ≈2000 ns in N₂. For comparison, the respective PL decay times of films of NPB:TPBi are 16 ns in air versus 131 and 600 ns in N₂, and of NPB:PPh₃O they are 29 ns in air versus 56, 483, and weak ≈2000 ns in N₂. Furthermore it is suspected that slow emitting states are associated with a PPh₃O aggregate interacting with NPB.

View Accepted Manuscript (DOE)

Research Organization:: Ames Laboratory (AMES), Ames, IA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)

Grant/Contract Number:: AC02-07CH11358

OSTI ID:: 1575203

Alternate ID(s):: OSTI ID: 1574072

Report Number(s):: IS-J--10049

Journal Information:: Advanced Optical Materials, Journal Name: Advanced Optical Materials Journal Issue: 1 Vol. 8; ISSN 2195-1071

Publisher:: WileyCopyright Statement

Country of Publication:: United States

Language:: English

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Bright Deep Blue TADF OLEDs: The Role of Triphenylphosphine Oxide in NPB/TPBi:PPh₃O Exciplex Emission