Ultra-Narrowband Circularly Polarized Luminescence from Multiple 1,4-Azaborine-Embedded Helical Nanographenes

Journal of the American Chemical Society, Journal Year: 2024, Volume and Issue: 146(43), P. 29782 - 29791

Published: Oct. 22, 2024

In this manuscript we present a strategy to achieve ultranarrowband circularly polarized luminescence (CPL) from multiple 1,4-azaborine-embedded helical nanographenes. The impact of number and position boron nitrogen atoms in the rigid core molecule on optical properties─including absorption emission maxima, photoluminescence quantum yield, Stokes shift, excited singlet–triplet energy gap full width at half-maximum (fwhm) for CPL fluorescence─was investigated. molecules reported here exhibits fluorescence (fwhm 16–17.5 nm toluene) 18–19 toluene). To best our knowledge, is among narrowest any organic date. Quantum chemical calculations, including computed spectra involving vibronic contributions, provide valuable insights future molecular design aimed achieving narrowband CPL.

Language: Английский

Controlling of Circularly Polarized Luminescence via Modulating the Angle Between Transition Electric and Magnetic Dipole Moments

Advanced Functional Materials, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 21, 2025

Abstract The most challenging task in the development of chiral luminescent materials is currently increasing dissymmetry factors ( g PL , EL ) circularly polarized luminescence (CPL). Current research primarily focuses on enhancing molecular transition magnetic dipole moment, while angle between electric and moment θ e,m has received comparatively limited attention. In this study, two pairs intrinsically axial fluorescence (CP‐MR‐F) thermally activated delayed (CP‐MR‐TADF) enantiomers R / S ‐BBCz‐BN ‐OBBCz‐BN) with increased by modulating are reported. Based ‐5 H ,5′ ‐6,6′‐bibenzo[ b ]carbazole units, theoretically calculated cal for 17.7° 1.1 × 10 −2 respectively, enabling excellent CPL properties | 5.8 −3 toluene, representing one highest values among MR materials. By employing less conjugated ‐7,7′,8,8′,9,9′,10,10′‐octahydro‐5 groups better electron donating ability, ‐OBBCz‐BN demonstrate good MR‐TADF a peak at 467 nm, full width half‐maximum 27 2.5 . Furthermore, optimized organic light‐emitting diodes based these showcase high maximum external quantum efficiencies 24.7%/33.3% mirror symmetrical electroluminescence 3.4/1.2 respectively.

Language: Английский

Circularly Polarized Electroluminescence From Chiral Manganese(II) Complexes

Advanced Optical Materials, Journal Year: 2024, Volume and Issue: unknown

Published: Dec. 25, 2024

Abstract Due to the circularly polarized luminescence (CPL) and high efficiency, chiral phosphorescent complex holds promise for CP organic light‐emitting diode (CP‐OLED) 3D display, but application of manganese(II) (Mn(II)) is rare. Herein, CP‐OLEDs with Mn(II) enantiomers, R / S ‐DFPO‐MnBr 2 ‐XTDPO‐MnBr , based on tert ‐butyl(6‐(diphenylphosphoryl) dibenzo[ b d ]furan‐4‐yl)(phenyl)phosphine oxide ‐butyl(5‐(diphenylphosphoryl)‐9,9‐dimethyl‐9 H ‐xanthen‐4‐yl)(phenyl) phosphine ligands are reported containing phosphorus‐centered point chirality. exhibit yellow‐green emissions peaking at 541 532 nm photoluminescence quantum yields up 87%, CPL spectra dissymmetry factors (| g PL |) around 2.0 × 10 −3 . The achieve external efficiencies 12.9% electroluminescence | EL values about 1.8 10⁻ 3 suggesting potential complexes.

Language: Английский