White light emission from a single organic molecule with dual phosphorescence at room temperature

He, Zikai; Zhao, Weijun; Lam, Jacky W. Y.; Peng, Qian; Ma, Huili; Liang, Guodong; Shuai, Zhigang; Tang, Ben Zhong

doi:10.1038/s41467-017-00362-5

Cited by 712 publications

(434 citation statements)

References 59 publications

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“…Although the first three molecules are of the same genre, the perceivable spectroscopic difference is more likely to stem from a variation in aggregation states (Figure S3 (Supporting Information), powder XRD patterns) and energy level distributions imposed by the substituent. The excited‐state dynamics of benzothiophene–benzophenone and carbazole–benzophenone dyads and anthrquiunone derivatives in the solid state was recently elucidated by Tang and co‐workers and us, where a bi‐level emissive triplet state in thermal equilibrium is responsible for a high‐energy, shorter‐lived (approximately sub‐millisecond) 3 n –π* transition largely localized on the benzophenone moiety and a lower‐energy, longer‐lived (approximately sub‐s) 3 π–π* state mostly originated from the benzothiophene subunit.…”

Section: Methodsmentioning

confidence: 99%

Aggregation‐Induced Dual‐Phosphorescence from Organic Molecules for Nondoped Light‐Emitting Diodes

et al. 2019

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Aggregation‐induced emission (AIE) is a beneficial strategy for generating highly effective solid‐state molecular luminescence without suffering losses in quantum yield. However, the majority of reported AIE‐active molecules exhibit only strong fluorescence, which is not ideal for electrical excitation in organic light‐emitting diodes (OLEDs). By introducing various substituent groups onto the biscarbazole compound, a series of molecular materials with aggregation‐induced phosphorescence (AIP) is designed, which exhibits two distinctly different phosphorescence bands and an absolute solid‐state room‐temperature phosphorescence quantum yield up to 64%. Taking advantage of the AIE feature, the AIP molecules are fabricated into OLEDs as a homogeneous light‐emitting layer, which allows for relatively small efficiency roll‐off and shows an external electroluminescence quantum yield of up to 5.8%, more than the theoretical limit for purely fluorescent OLED devices. The design showcases a promising strategy for the production of cost‐effective and highly efficient OLED technology.

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Section: Methodsmentioning

confidence: 99%

Aggregation‐Induced Dual‐Phosphorescence from Organic Molecules for Nondoped Light‐Emitting Diodes

et al. 2019

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“…For the monomeric state of 1 in pure DMF, a smooth and broad phosphorescence band is observed. In contrast, it is split in EA‐ETH, TOU‐BUT and ACN crystals (Figures a, S14), reflecting the aggregated state only contained one phosphorescent component that can be assigned into vibrational structures rather than multiple species . Furthermore, the singlet‐triplet energy gap (Δ E st) varies little among these crystals as described by the identical band wavelength of both the fluorescence and phosphorescence in Figure a.…”

Section: Figurementioning

confidence: 98%

Crystal Multi‐Conformational Control Through Deformable Carbon‐Sulfur Bond for Singlet‐Triplet Emissive Tuning

et al. 2019

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Crystal‐state luminophores have been of great interest in optoelectronics for years, whereas the excited state regulation at the crystal level is still restricted by the lack of control ways. We report that the singlet‐triplet emissive property can be profoundly regulated by crystal conformational distortions. Employing fluoro‐substituted tetrakis(arylthio)benzene luminophores as prototype, we found that couples of molecular conformations formed during different crystallizations. The deformable carbon‐sulphur bond essentially drove the distortion of the molecular conformation and varied the stacking mode, together with diverse non‐covalent interactions, leading to the proportional adjustment of the fluorescence and phosphorescence bands. This intrinsic strategy was further applied for solid‐state multicolor emissive conversion and mechanoluminescence, probably offering new insights for design of smart crystal luminescent materials.

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“…In addition, the RTP based white‐light emitters are sprouting currently. The undeveloped design strategies of materials with the low quantum efficiencies and extremely long lifetimes of their triplet excited states limit their applications in the WOLEDs …”

Section: White Electroluminescence Devicesmentioning

confidence: 99%

Single‐Molecular White‐Light Emitters and Their Potential WOLED Applications

et al. 2020

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White organic light‐emitting diodes (WOLEDs) are superior to traditional incandescent light bulbs and compact fluorescent lamps in terms of their merits in ensuring pure white‐light emission, low‐energy consumption, large‐area thin‐film fabrication, etc. Unfortunately, WOLEDs based on multilayered or multicomponent (red, green, and blue (RGB)) emissive layers can suffer from some remarkable disadvantages, such as intricate device fabrication and voltage‐dependent emission color, etc. Single molecules, which can emit white light, can be used to replace multiple emitters, leading to a simplified fabrication process, stable and reproducible WOLEDs. Recently, the performance of WOLEDs by using single molecules is catching up with that of the state‐of‐the‐art devices fabricated by multicomponent emitters. Therefore, an increasing attention has been paid on single white‐light‐emitting materials for efficient WOLEDs. In this review, different mechanisms of white‐light emission from a single molecule and the performance of single‐molecule‐based WOLEDs are collected and expounded, hoping to light up the interesting subject on single‐molecule white‐light‐emitting materials, which have great potential as white‐light emitters for illumination and lighting applications in the world.

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White light emission from a single organic molecule with dual phosphorescence at room temperature

Cited by 712 publications

References 59 publications

Aggregation‐Induced Dual‐Phosphorescence from Organic Molecules for Nondoped Light‐Emitting Diodes

Aggregation‐Induced Dual‐Phosphorescence from Organic Molecules for Nondoped Light‐Emitting Diodes

Crystal Multi‐Conformational Control Through Deformable Carbon‐Sulfur Bond for Singlet‐Triplet Emissive Tuning

Single‐Molecular White‐Light Emitters and Their Potential WOLED Applications

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