Mapping the Regioisomeric Space and Visible Color Range of Purely Organic Dual Emitters with Ultralong Phosphorescence Components: From Violet to Red Towards Pure White Light

Abstract

We mapped the entire visible range of the electromagnetic spectrum and achieved white light emission (CIE: 0.31, 0.34) by combining the intrinsic ns‐fluorescence with ultralong ms‐phosphorescence from purely organic dual emitters. We realized small molecular materials showing high photoluminescence quantum yields (ΦL) in the solid state at room temperature, achieved by active exploration of the regioisomeric substitution space. Chromophore stacking‐supported stabilization of triplet excitons with assistance from enhanced intersystem crossing channels in the crystalline state played the primary role for the ultra‐long phosphorescence. This strategy covers the entire visible spectrum, based on organic phosphorescent emitters with versatile regioisomeric substitution patterns, and provides a single molecular source of white light with long lifetime (up to 163.5 ms) for the phosphorescent component, and high overall photoluminescence quantum yields (up to ΦL=20 %).

A processable, scalable, and stable full-color ultralong afterglow system based on heteroatom-free hydrocarbon doped polymers

“…Secondly, the ISC transition from S 1 to T n is regarded as possible when the energy level of a triplet state (T n ) lies within the range AE0.3 eV to ES1 (the energy level of the lowest excited singlet S 1 state), while with the same transition orbital compositions. 54,81,82,86 The SOC constants (x) between the involved singlet and triplet states can be referred to estimate the possibility of ISC. [87][88][89] As shown in Fig.…”

Halogen Bonding: A New Platform for Achieving Multi‐Stimuli‐Responsive Persistent Phosphorescence

“…Recently, Voskuhl et al. achieved white light emission (Commission Internationale de L'Eclairage (CIE) coordinates of 0.31, 0.34) by combining the intrinsic ns‐fluorescence with ms‐phosphorescence from purely organic dual emitters through regioisomeric substitution patterns [8] . Zhao et al.…”

Dual-Mode White Light Emissions from a Single Copolymer with an Ultralong Phosphorescence Lifetime

“…Organic white-light-emitting materials are attracting increasing interest owing to potential applications in solid-state lighting, next-generation displays, anti-counterfeiting, molecular sensors, and multimodal bioimaging. − So far, most studies − are based on the multi-component mixture of different emitting colors to obtain white light, either by mixing the three primary colors RGB (red, green, and blue) or by mixing the two complementary colors (blue and yellow). Compared with the mixing method, integrating the luminous chromophores of different colors into a single molecule exhibit more advantages, such as no phase separation, good stability and repeatability, ease of device fabrication, and so forth.…”