Achieving Multi‐Color Emissive Organic Light‐Emitting Diodes With Single‐Component Molecule Through Conformational Regulation DOI Creative Commons

Xiang Long,

Zhiwei Ma,

H. J. Dai

et al.

Aggregate, Journal Year: 2025, Volume and Issue: unknown

Published: Feb. 21, 2025

ABSTRACT Purely organic single‐component luminescent materials enabling multi‐color photoluminescence are gaining significant interest, given their tunable optical properties, environmental friendliness, and cost‐effectiveness. However, realizing electroluminescence from a emitter for application in light‐emitting diode (OLED) remains challenging, mainly due to the limitations achieving distinct excited‐state conformations amorphous or solid states. In this study, we report two novel emitters (Bppy‐PTZ Bpph‐PTZ) by incorporating benzophenone acceptor phenothiazine donor with pyridyl phenyl π‐bridging spacers. The introduction of pyridine ring Bppy‐PTZ establishes intramolecular hydrogen bonding, stabilizing quasi‐axial (QA) conformation state, thereby facilitating white‐light emissions thin‐film OLED devices. Photophysical theoretical analyses reveal emission behaviors QA quasi‐equatorial conformations, exhibiting enhanced dual‐emission mechanochromic properties. Importantly, adopting Bppy‐PTZ, fabricated OLEDs realize color‐tunable emissions, including blue, yellow, adjustable white lights, reaching maximum external quantum efficiencies up 15.5%. This work provides valuable insights development efficient affording high performances.

Language: Английский

Achieving Multi‐Color Emissive Organic Light‐Emitting Diodes With Single‐Component Molecule Through Conformational Regulation DOI Creative Commons

Xiang Long,

Zhiwei Ma,

H. J. Dai

et al.

Aggregate, Journal Year: 2025, Volume and Issue: unknown

Published: Feb. 21, 2025

ABSTRACT Purely organic single‐component luminescent materials enabling multi‐color photoluminescence are gaining significant interest, given their tunable optical properties, environmental friendliness, and cost‐effectiveness. However, realizing electroluminescence from a emitter for application in light‐emitting diode (OLED) remains challenging, mainly due to the limitations achieving distinct excited‐state conformations amorphous or solid states. In this study, we report two novel emitters (Bppy‐PTZ Bpph‐PTZ) by incorporating benzophenone acceptor phenothiazine donor with pyridyl phenyl π‐bridging spacers. The introduction of pyridine ring Bppy‐PTZ establishes intramolecular hydrogen bonding, stabilizing quasi‐axial (QA) conformation state, thereby facilitating white‐light emissions thin‐film OLED devices. Photophysical theoretical analyses reveal emission behaviors QA quasi‐equatorial conformations, exhibiting enhanced dual‐emission mechanochromic properties. Importantly, adopting Bppy‐PTZ, fabricated OLEDs realize color‐tunable emissions, including blue, yellow, adjustable white lights, reaching maximum external quantum efficiencies up 15.5%. This work provides valuable insights development efficient affording high performances.

Language: Английский

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