TY - JOUR
T1 - Solid cyclooctatetraene-based triplet quencher demonstrating excellent suppression of singlet–triplet annihilation in optical and electrical excitation
AU - Mai, Van T.N.
AU - Ahmad, Viqar
AU - Mamada, Masashi
AU - Fukunaga, Toshiya
AU - Shukla, Atul
AU - Sobus, Jan
AU - Krishnan, Gowri
AU - Moore, Evan G.
AU - Andersson, Gunther G.
AU - Adachi, Chihaya
AU - Namdas, Ebinazar B.
AU - Lo, Shih Chun
PY - 2020/11/6
Y1 - 2020/11/6
N2 - Triplet excitons have been identified as the major obstacle to the realisation of organic laser diodes, as accumulation of triplet excitons leads to significant losses under continuous wave (CW) operation and/or electrical excitation. Here, we report the design and synthesis of a solid-state organic triplet quencher, as well as in-depth studies of its dispersion into a solution processable bis-stilbene-based laser dye. By blending the laser dye with 20 wt% of the quencher, negligible effects on the ASE thresholds, but a complete suppression of singlet–triplet annihilation (STA) and a 20-fold increase in excited-state photostability of the laser dye under CW excitation, were achieved. We used small-area OLEDs (0.2 mm2) to demonstrate efficient STA suppression by the quencher in the nanosecond range, supported by simulations to provide insights into the observed STA quenching under electrical excitation. The results demonstrate excellent triplet quenching ability under both optical and electrical excitations in the nanosecond range, coupled with excellent solution processability.
AB - Triplet excitons have been identified as the major obstacle to the realisation of organic laser diodes, as accumulation of triplet excitons leads to significant losses under continuous wave (CW) operation and/or electrical excitation. Here, we report the design and synthesis of a solid-state organic triplet quencher, as well as in-depth studies of its dispersion into a solution processable bis-stilbene-based laser dye. By blending the laser dye with 20 wt% of the quencher, negligible effects on the ASE thresholds, but a complete suppression of singlet–triplet annihilation (STA) and a 20-fold increase in excited-state photostability of the laser dye under CW excitation, were achieved. We used small-area OLEDs (0.2 mm2) to demonstrate efficient STA suppression by the quencher in the nanosecond range, supported by simulations to provide insights into the observed STA quenching under electrical excitation. The results demonstrate excellent triplet quenching ability under both optical and electrical excitations in the nanosecond range, coupled with excellent solution processability.
KW - Electronic and spintronic devices
KW - Electronic devices
KW - Electronic materials
KW - Semiconductor lasers
KW - Triplet excitons
KW - organic laser diodes
UR - http://www.scopus.com/inward/record.url?scp=85095697439&partnerID=8YFLogxK
UR - http://purl.org/au-research/grants/ARC/DP160100700
UR - http://purl.org/au-research/grants/ARC/DP200103036
U2 - 10.1038/s41467-020-19443-z
DO - 10.1038/s41467-020-19443-z
M3 - Article
C2 - 33159048
AN - SCOPUS:85095697439
SN - 2041-1723
VL - 11
JO - Nature Communications
JF - Nature Communications
M1 - 5623
ER -