Single-component color-tunable circularly polarized organic afterglow through chiral clusterization

Abstract

Circularly polarized organic afterglow (CPOA) with both long-lived room-temperature phosphorescence (RTP) and circularly polarized luminescence (CPL) is currently attracting great interest, but the development of multicolor-tunable CPOA in a single-component material remains a formidable challenge. Here, we report an efficient strategy to achieve multicolor CPOA molecules through chiral clusterization by implanting chirality center into non-conjugated organic cluster. Owing to excitation-dependent emission of clusters, highly efficient and significantly tuned CPOA emissions from blue to yellowish-green with dissymmetry factor over 2.3 × 10−3 and lifetime up to 587 ms are observed under different excitation wavelengths. With the distinguished color-tunable CPOA, the multicolor CPL displays and visual RTP detection of ultraviolent light wavelength are successfully constructed. These results not only provide a new paradigm for realization of multicolor-tunable CPOA materials in single-component molecular systems, but also offer new opportunities for expanding the applicability of CPL and RTP materials for diversified applications.

Ultraviolet phosphorescent carbon nanodots

“…From the El-Sayed rule, the process of the ISC transition of the 1 (n, π * ) → 3 (π, π * ) and 1 (π, π * ) → 3 (n, π * ) is easy to implement 26 . However, the ISC of the 1 (n, π * ) → 3 (n, π * ) or 1 (π, π * ) → 3 (π, π * ) with similar electronic configurations is not effective due to the spin-forbidden transition, which leads to the low efficiency of SOC 27 . Therefore, for the recombination rate of triplet excitons, the 3 (π, π * ) triplet has a slow recombination rate compared to 3 (n, π * ) due to the spin-forbidden transition 28 , 29 .…”

Strong Circularly‐Polarized Room‐Temperature Phosphorescence from a Feasibly Separable Scaffold of Bidibenzo[b,d]furan with Locked Axial Chirality

“…Moreover, novel RTP materials with CPL characteristics have rarely been obtained [14] . To date, only several successful examples with long‐lived room‐temperature circularly‐polarized phosphorescence have been reported through the restriction of motions of chiral luminophores in the crystalline state, [14b,c] rigid host matrix, [14a, 15] chiral clusterization, [16] and polymer matrix [14e, 17] . However, either luminescence efficiency or dissymmetry factor is found far from satisfactory after a brief summary in Figure S1.…”

Resonance-Induced Stimuli-Responsive Capacity Modulation of Organic Ultralong Room Temperature Phosphorescence

“…Smart luminescent materials with self-responsive properties to external stimuli, including light, temperature, solvent, mechanics, etc., have attracted increasing attention owing to their substantial promise in diverse optoelectronic applications. − Organic ultralong room temperature phosphorescence (OURTP) materials with lifetime over 100 ms have emerged as a hot research topic because of their extraordinary character of long-lived and dynamic luminescent properties, especially when they become smart, showing modulated emission lifetime and color corresponding to external stimuli in real time. − With the smart stimuli-responsive OURTP materials, advanced applications including multilevel encryption and rewriteable security printing are applicable, ,− sharply elevating our understanding of organoelectronics through excited state modulation. Nevertheless, high-performance stimuli-responsive OURTP materials are still very rare, which is mainly due to the limited understanding of stimuli-responsivity regulation and the lack of effective material design strategies.…”