Bright Deep Blue TADF OLEDs: The Role of Triphenylphosphine Oxide in NPB/TPBi:PPh3O Exciplex Emission
Abstract
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.
- Authors:
-
[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)
- Publication Date:
- Research Org.:
- Ames Lab., Ames, IA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- OSTI Identifier:
- 1575203
- Alternate Identifier(s):
- OSTI ID: 1574072
- Report Number(s):
- IS-J-10049
Journal ID: ISSN 2195-1071
- Grant/Contract Number:
- AC02‐07CH11358; ECCS 1202309
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Advanced Optical Materials
- Additional Journal Information:
- Journal Volume: 8; Journal Issue: 1; Journal ID: ISSN 2195-1071
- Publisher:
- Wiley
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE; all‐organic OLEDs; bright deep blue OLEDs; exciplex TADF OLEDs
Citation Formats
Hippola, Chamika, Danilovic, Dusan, Bhattacharjee, Ujjal, Perez‐Bolivar, Cesar, Sachinthani, K. A. Niradha, Nelson, Toby L., Anzenbacher, Pavel, Petrich, Jacob W., Shinar, Ruth, and Shinar, Joseph. Bright Deep Blue TADF OLEDs: The Role of Triphenylphosphine Oxide in NPB/TPBi:PPh3O Exciplex Emission. United States: N. p., 2019.
Web. doi:10.1002/adom.201901282.
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. Bright Deep Blue TADF OLEDs: The Role of Triphenylphosphine Oxide in NPB/TPBi:PPh3O Exciplex Emission. United States. doi:10.1002/adom.201901282.
Hippola, Chamika, Danilovic, Dusan, Bhattacharjee, Ujjal, Perez‐Bolivar, Cesar, Sachinthani, K. A. Niradha, Nelson, Toby L., Anzenbacher, Pavel, Petrich, Jacob W., Shinar, Ruth, and Shinar, Joseph. Wed .
"Bright Deep Blue TADF OLEDs: The Role of Triphenylphosphine Oxide in NPB/TPBi:PPh3O Exciplex Emission". United States. doi:10.1002/adom.201901282. https://www.osti.gov/servlets/purl/1575203.
@article{osti_1575203,
title = {Bright Deep Blue TADF OLEDs: The Role of Triphenylphosphine Oxide in NPB/TPBi:PPh3O Exciplex Emission},
author = {Hippola, Chamika and Danilovic, Dusan and Bhattacharjee, Ujjal and Perez‐Bolivar, Cesar and Sachinthani, K. A. Niradha and Nelson, Toby L. and Anzenbacher, Pavel and Petrich, Jacob W. and Shinar, Ruth and Shinar, Joseph},
abstractNote = {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.},
doi = {10.1002/adom.201901282},
journal = {Advanced Optical Materials},
number = 1,
volume = 8,
place = {United States},
year = {2019},
month = {11}
}
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