Journal
ADVANCED FUNCTIONAL MATERIALS
Volume 31, Issue 43, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.202104529
Keywords
current injection; electron-affinity substituents; organic lasing; singlet-triplet annihilation; triplet scavenging
Categories
Funding
- Japan Science and Technology Agency (JST), ERATO, Adachi Molecular Exciton Engineering Project, under JST ERATO, Japan [JPMJER1305]
- Japan Society for the Promotion of Science (JSPS) Core to Core Program (Advanced Research Networks)
- JSPS KAKENHI [20H02817]
- Samco Foundation
- Iketani Science and Technology Foundation
- Murata Science Foundation
- Grants-in-Aid for Scientific Research [20H02817] Funding Source: KAKEN
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The research explores the manipulation of functional substituents to tune the luminescence and lasing properties of organic gain media. By connecting a cyanophenyl moiety to DCNP, efficient control of the emission spectrum for high-quality lasing without detrimental singlet-triplet annihilation is achieved.
Rationally manipulating the functional substituents plays a crucial role in tuning the luminescence and lasing properties of organic gain media. Herein, a cyanophenyl-moiety, which exhibits relatively weaker electron affinity, is connected to 2,6-dicarbonitrile diphenyl-1 lambda(5)-phosphinine (DCNP) via para-linking. Resultantly, the appreciated locally-excited characteristics ensuring a large oscillator strength and high radiative rate can be reserved in DCNP-4-(4-cyanophenyl) (DCNP-pCN). Interestingly, the weak charge-transfer state from the relative donor (D)/acceptor (A) interplay enables small singlet-triplet splitting (Delta E-ST approximate to 0.45 eV). Thus the triplets generated on DCNP-pCN can be efficiently scavenged by 4,4'-bis[(N-carbazole)styryl]biphenyl (BSBCz), which is used as the host with a lower-lying triplet energy level for DCNP-pCN. Moreover, benefitting from the mediation between the conjugated length extension and weak D/A interplay, the emission spectrum cannot be largely shifted, which can effectively suppress the overlap between the lasing emission of DCNP-pCN and the excited-state absorption of BSBCz, thereby avoiding detrimental singlet-triplet annihilation. Thus, high-quality distributed feedback lasings with approximate to 2.0 mu J cm(-2) thresholds are achieved, and the organic light-emitting diodes exhibit external quantum efficiency exceeding 2.0% without efficiency rolloff under high current injection, indicating the potential for electrical-pumping organic lasings.
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