Multi‐Color Pure Organic Room Temperature Phosphorescent Materials with Long Lifetime and High Efficiency

Abstract

Organic room temperature phosphorescent (ORTP) materials have garnered significant interest in the fields of anti‐counterfeiting, optical display, and bio‐imaging owing to their distinctive optical properties. However, a major drawback of most existing ORTP materials is their short phosphorescence lifetime and low quantum yields (QYs), which greatly limit their applicability across multiple fields. In this paper, a covalently assisted host‐guest doping strategy that involves embedding three aminobenzoic acids with different carboxylate substitution positions into a cyanuric acid (CA) matrix through covalent bonding using microwave heating is proposed. All three prepared ORTP materials exhibit long phosphorescence lifetime exceeding 600 ms and high phosphorescence quantum yields (PhQYs) surpassing 20%. Among them, the composite of 2‐aminoterephthalic acid (2‐A) anuric acid stands out with its unique blue phosphorescence, boasting an exceptional absolute photoluminescence quantum yield (PLQY) of 98.95% and remarkable phosphorescence quantum yield (PhQY) of 76.42%, along with a long lifetime of 800 ms. Importantly, these high‐performance ORTP materials have been successfully utilized in anti‐counterfeiting and display applications.

Achieving Efficient Dark Blue Room‐Temperature Phosphorescence with Ultra‐Wide Range Tunable‐Lifetime

“…In the current reports, it was particularly rare to obtain dark blue RTP materials with such excellent properties using a simple single benzene structure [10,22] . To further enhance the photophysical properties of the doped films, we used substituent engineering, [23] because it is a simpler and more effective strategy in modulating the photophysical properties.…”

Photo- and Oxygen- Synergistically Controlled Selective Expression of Organic Phosphorescence Units

“…Ultralong organic room-temperature phosphorescence (UORTP) has been achieving rapid development in recent years − due to its wide applications in bioimaging, − sensors, − display, data encryption, − etc. Since it is revealed that trace impurity greatly affects UORTP properties, host–guest doping has become a popular strategy to construct UORTP systems and improve UORTP properties. − Generally, both small molecules and polymers can function as the host, and the host library is still growing. Important small-molecule hosts include carbazole derivatives, − triphenylamine derivatives, , and so on because they can form charge separation and charge combination states with the guest.…”

Circularly polarized room-temperature phosphorescence enhanced by dynamic cross-linked network fixation

“…In comparison to conventional RTP materials, organic RTP materials with a long afterglow phenomenon exhibit enhanced biocompatibility, photophysical properties, and sensitivity to stimuli. 1–5 Consequently, they hold promising potential for various applications, including optical multiplexing, anti-counterfeiting, and information protection. 6–10 Nonetheless, the RTP emission from pure organic molecules is greatly susceptible to environmental factors, such as temperature, water, and oxygen.…”