TY - JOUR
T1 - 2,6-Dicarbonitrile Diphenyl-1λ5-Phosphinine (DCNP)—A Robust Conjugated Building Block for Multi-Functional Dyes Exhibiting Tunable Amplified Spontaneous Emission
AU - Balijapalli, Umamahesh
AU - Tang, Xun
AU - Okada, Daichi
AU - Lee, Yi Ting
AU - Karunathilaka, Buddhika S.B.
AU - Auffray, Morgan
AU - Tumen-Ulzii, Ganbaatar
AU - Tsuchiya, Youichi
AU - Sandanayaka, Atula S.D.
AU - Matsushima, Toshinori
AU - Nakanotani, Hajime
AU - Adachi, Chihaya
N1 - Funding Information:
U.B. and X.T. contributed equally to this work. The authors thank N. Nakamura and K. Kusuhara for their technical assistance with this research. This work was supported financially in part by the Program for Building Regional Innovation Ecosystems of the Ministry of Education, Culture, Sports, Science and Technology (MEXT), Japan, and Japan Society for the Promotion of Science (JSPS) KAKENHI Grant Number JP21H02015 and Core‐to‐Core program.
Publisher Copyright:
© 2021 Wiley-VCH GmbH
PY - 2021/11/4
Y1 - 2021/11/4
N2 - Highly efficient organic light-emitting diodes (OLEDs) with the concurrent achievement of high external electroluminescence quantum efficiency (EQE) and low light amplification thresholds under optical excitation have been considered as a crucial evolution towards the development of high-performance electrically pumped organic semiconductor laser diodes. Herein, a series of 2,6-dicarbonitrile-diphenyl-1λ5-phosphinine (DCNP) based donor (D)-acceptor (A) type dyes with different electron-withdrawing and donating moieties have been designed and characterized. The well-manipulated D-A strength with tunable optical properties guaranteed the low amplified spontaneous emission (ASE) thresholds of below 10 µJ cm−2 and furnished a wide-range color-tuning capability in the visible region (485–595 nm). Furthermore, employing a thermally-activated delayed fluorescence (TADF) molecule as a triplet harvester boosted the performance of OLEDs based on mDMCz that exhibits an exceptional EQE value of 18.4% which is an eightfold enhancement as compared with that of standard fluorescence OLEDs. Also, the TADF-assistant fluorescence (TAF) system enables a reduction of the ASE threshold to 3 µJ cm−2 and excellent ASE stability. These results provide a rational design strategy to construct color-tunable lasing dyes with reduced ASE thresholds and clarify their potentiality as the fluorescent dopant in the TAF system to utilize up-converted triplet excitons via efficient energy transfer.
AB - Highly efficient organic light-emitting diodes (OLEDs) with the concurrent achievement of high external electroluminescence quantum efficiency (EQE) and low light amplification thresholds under optical excitation have been considered as a crucial evolution towards the development of high-performance electrically pumped organic semiconductor laser diodes. Herein, a series of 2,6-dicarbonitrile-diphenyl-1λ5-phosphinine (DCNP) based donor (D)-acceptor (A) type dyes with different electron-withdrawing and donating moieties have been designed and characterized. The well-manipulated D-A strength with tunable optical properties guaranteed the low amplified spontaneous emission (ASE) thresholds of below 10 µJ cm−2 and furnished a wide-range color-tuning capability in the visible region (485–595 nm). Furthermore, employing a thermally-activated delayed fluorescence (TADF) molecule as a triplet harvester boosted the performance of OLEDs based on mDMCz that exhibits an exceptional EQE value of 18.4% which is an eightfold enhancement as compared with that of standard fluorescence OLEDs. Also, the TADF-assistant fluorescence (TAF) system enables a reduction of the ASE threshold to 3 µJ cm−2 and excellent ASE stability. These results provide a rational design strategy to construct color-tunable lasing dyes with reduced ASE thresholds and clarify their potentiality as the fluorescent dopant in the TAF system to utilize up-converted triplet excitons via efficient energy transfer.
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U2 - 10.1002/adom.202101122
DO - 10.1002/adom.202101122
M3 - Article
AN - SCOPUS:85114111453
VL - 9
JO - Advanced Optical Materials
JF - Advanced Optical Materials
SN - 2195-1071
IS - 21
M1 - 2101122
ER -