Improving Pure Organic Room‐Temperature Phosphorescence by Substituent Effect of Thianthrene DOI Open Access

Zhe Feng,

Zhiqiang Yang,

Shuaiqiang Zhao

и другие.

Chinese Journal of Chemistry, Год журнала: 2025, Номер unknown

Опубликована: Март 17, 2025

Comprehensive Summary To gain insights into the potential of thianthrene (TA), its substituent effects were systematically studied on room‐temperature phosphorescence (RTP) properties, including electron‐donating and electron‐withdrawing substituents at 1‐ 2‐positions TA, respectively. Both theoretical experimental investigations show that 2‐position greatly enhance RTP performance than 1‐position substituents, while situation is exactly opposite for substituents. Compared with substitution, induce higher radiation rate lower non‐radiation rate, in favor enhancement efficiency. Furthermore, introduction phenylene substitution suppresses non‐radiation, resulting simultaneously improved efficiency elongated lifetime. Finally, using these materials, dynamically reversible operations information (write‐read‐erase) are realized, as well encryption time‐dependent decryption demonstration. This work not only provides a better understanding structure–property relationship TA‐based but also suggests an intramolecular structural modification strategy to improve pure organic materials.

Язык: Английский

Application of room-temperature phosphorescent carbon dots in information encryption and anti-counterfeiting DOI
Linlin Shi,

Luyao Ding,

Yongqiang Zhang

и другие.

Nano Today, Год журнала: 2024, Номер 55, С. 102200 - 102200

Опубликована: Фев. 13, 2024

Язык: Английский

Процитировано

57
Highly Efficient Purely Organic Phosphorescence Light‐Emitting Diodes Employing a Donor–Acceptor Skeleton with a Phenoxaselenine Donor DOI Creative Commons
Zijian Chen, Mengke Li, Qing Gu

и другие.

Advanced Science, Год журнала: 2023, Номер 10(12)

Опубликована: Фев. 20, 2023

Purely organic room-temperature phosphorescence (RTP) materials generally exhibit low quantum yield (ϕP ) and long lifetime (τP due to the theoretically spin-forbidden triplet state. Herein, by introducing a donor-acceptor (D-A) skeleton with phenoxaselenine donor, three nonaromatic amine donor containing compounds high ϕP short τP in amorphous films are developed. Besides enhanced spin-orbit coupling (SOC) heavy-atom effect of selenium, D-A which facilitates orbital angular momentum change can further boost SOC, severe nonradiative energy dissipation is also suppressed rigid molecular structure. Consequently, record-high external efficiency 19.5% achieved for RTP light-emitting diode (OLED) based on 2-(phenoxaselenin-3-yl)-4,6-diphenyl-1,3,5-triazine (PXSeDRZ). Moreover, voltage-dependent color-tunable emission single-molecule white realized. These results shed light broad prospects purely as highly efficient OLED emitters especially potential charming lighting applications.

Язык: Английский

Процитировано

50
Finely manipulating room temperature phosphorescence by dynamic lanthanide coordination toward multi-level information security DOI Creative Commons

Longqiang Li,

Jiayin Zhou,

Junyi Han

и другие.

Nature Communications, Год журнала: 2024, Номер 15(1)

Опубликована: Май 8, 2024

Abstract Room temperature phosphorescence materials have garnered significant attention due to their unique optical properties and promising applications. However, it remains a great challenge finely manipulate phosphorescent achieve desirable performance on demand. Here, we show feasible strategy organic by introducing dynamic lanthanide coordination. The phosphors of terpyridine phenylboronic acids possessing excellent coordination ability are covalently embedded into polyvinyl alcohol matrix, leading ultralong room with lifetime up 0.629 s. Notably, such performance, including intensity lifetime, can be well controlled varying the dopant. Relying modulable these lanthanide-manipulated films, multi-level information encryption attacker-misleading spatial-time-resolved applications is successfully demonstrated greatly improved security level. This work opens an avenue for manipulating meet versatile uses in

Язык: Английский

Процитировано

42
Highly efficient solution-processable four-coordinate boron compound: A thermally activated delayed fluorescence emitter with short-lived phosphorescence for OLEDs with small efficiency roll-off DOI

Zhengqin Pan,

Jie Pan,

Long Sang

и другие.

Chemical Engineering Journal, Год журнала: 2024, Номер 483, С. 149221 - 149221

Опубликована: Фев. 2, 2024

Язык: Английский

Процитировано

30
Purely Organic Room‐Temperature Phosphorescence Molecule for High‐Performance Non‐Doped Organic Light‐Emitting Diodes DOI

Xiaoluo Peng,

Peng Zou,

Jiajie Zeng

и другие.

Angewandte Chemie International Edition, Год журнала: 2024, Номер 63(29)

Опубликована: Апрель 30, 2024

Abstract Purely organic molecules with room‐temperature phosphorescence (RTP) are potential luminescent materials high exciton utilization for light‐emitting diodes (OLEDs), but those exhibiting superb electroluminescence (EL) performances rarely explored, mainly due to their long lifetimes. Herein, a robust purely RTP molecule, 3,6‐bis(5‐phenylindolo[3,2‐a]carbazol‐12(5H)‐yl)‐xanthen‐9‐one (3,2‐PIC‐XT), is developed. The neat film of 3,2‐PIC‐XT shows strong green very short lifetime (2.9 μs) and photoluminescence quantum yield (72 %), behaviors balanced bipolar charge transport. nature validated by steady‐state transient absorption emission spectroscopies, the working mechanism deciphered theoretical simulation. Non‐doped multilayer OLEDs using thin films furnish an outstanding external efficiency (EQE) 24.91 % extremely low roll‐off (1.6 %) at 1000 cd m −2 . High‐performance non‐doped top‐emitting tandem also achieved, providing remarkable EQEs 24.53 42.50 %, respectively. Delightfully, simplified employing thick realized, furnishing excellent EQE 17.79 greatly enhanced operational lifetime. temperature‐dependent EL spectroscopies demonstrate electrophosphorescence attribute 3,2‐PIC‐XT. These best devices based on reported so far.

Язык: Английский

Процитировано

23
Advancing Triplet Exciton Harvesting Through Heavy Atom Selenium Manipulation in Multiple Resonance Thermally Activated Delayed Fluorescent Emitters DOI
Zijian Chen, Denghui Liu, Mengke Li

и другие.

Advanced Functional Materials, Год журнала: 2024, Номер unknown

Опубликована: Апрель 21, 2024

Abstract In the development of organic light‐emitting diodes (OLEDs) with high efficiency and minimal roll‐off, fast reverse intersystem crossing (RISC) in multi‐resonance thermally activated delayed fluorescence (MR‐TADF) materials is critical. The RISC process typically hindered by insufficient spin‐orbital coupling (SOC). Incorporating heavy atom selenium into MR‐TADF structure has potential to enhance SOC through effect. However, specific placement within molecule results different enhancements SOC, detailed interplay between these factors yet be elucidated. introduction a selenium‐containing moiety, phenoxaselenine, at substituted positions undertaken, revealing that 3‐substituted phenoxaselenine exhibits faster transition significant increase higher triplet excited states S 1 state, compared 2‐substituted phenoxaselenine. Significantly reduced roll‐off achieved for narrow‐band emission OLEDs based on owing enhanced effect, giving an impressive external quantum above 20% even under 10 000 cd m −2 corresponding OLED device. These underscore strategic effect manipulation efficient spin‐flipping.

Язык: Английский

Процитировано

19
Purely organic room-temperature phosphorescence sensitizers for highly efficient hyperfluorescence OLEDs DOI Creative Commons
Jiajie Zeng,

Shaoxin Song,

Yan Fu

и другие.

Science Advances, Год журнала: 2025, Номер 11(12)

Опубликована: Март 21, 2025

Multiresonance thermally activated delayed fluorescence (MR-TADF) emitters are promising candidates for organic light-emitting diodes (OLEDs) with high color quality. However, in most cases, noble metal–containing phosphors required as sensitizers MR-TADF to improve their electroluminescence (EL) performances, which may lead cost and environmental pollution. Herein, an efficient purely room-temperature phosphorescence (RTP) material, 3,2-PIC-TXT, fast radiation is developed. It not only exhibits impressive EL performances emitter outstanding external quantum efficiency (EQE) of 33.2%, higher than that Ir(ppy) 3 (25.2%), but also functions remarkably a sensitizer green (BN2, tCzphB-Ph, tCzphB-Fl). The hyperfluorescence OLEDs using 3,2-PIC-TXT provide ultrahigh EQEs 40.9 43.8%, superior those based on (37.0 38.0%), along superb purity excellent operational stability. These the best devices RTP materials reported so far.

Язык: Английский

Процитировано

4
A Facile Strategy for Achieving Polymeric Afterglow Materials with Wide Color‐Tunability and Persistent Near‐Infrared Luminescence DOI

Keyao Chen,

Yu Xiong, Deliang Wang

и другие.

Advanced Functional Materials, Год журнала: 2023, Номер 34(12)

Опубликована: Дек. 10, 2023

Abstract Polymer‐based room‐temperature phosphorescence (RTP) materials show promising applications in anti‐counterfeiting. To further realize multiscale and/or multimodal anti‐counterfeiting, it is highly desirable to develop polymeric afterglow with multiple security features. Herein, a facile strategy presented endow ultralong lifetime, wide color‐tunability, persistent near‐infrared (NIR) luminescence, and good water solubility via constructing non‐traditional resonance energy transfer (PRET) two‐step sequential systems. Specifically, the 1‐bromocarbazole derivatives blue‐color RTP property act as donor while traditional dyes red/NIR luminescence acceptor. By simply regulating doping composition concentration of these systems, multicolor organic covering from visible NIR region successfully realized. Notably, compared single‐step PRET, has unique advantages higher efficiency triplet excitons initial donor, wider range color‐tunability mediated by intermediary acceptor, enhanced delayed fluorescence final Finally, water‐soluble great potential advanced anti‐counterfeiting information technologies.

Язык: Английский

Процитировано

28
Room‐Temperature Phosphorescent Tough Hydrogels Based on Ionically Crosslinked Nonaromatic Polymers DOI Open Access

Junwen Deng,

Haiqi Liu,

Deyu Liu

и другие.

Advanced Functional Materials, Год журнала: 2023, Номер 34(1)

Опубликована: Сен. 15, 2023

Abstract Organic photoluminescent materials exhibiting room‐temperature phosphorescence (RTP) have attracted widespread attention. However, most of them can emit only in the solid state, which strongly limits their applications. Herein, a type phosphorescent hydrogel with excellent mechanical properties is prepared by immersing an as‐prepared poly(vinyl alcohol) (PVA) poly(sodium maleate) solution and then CaCl 2 solution, followed drying under stretching at 90 °C finally soaking it deionized water until equilibrium swelling to produce alcohol)/poly(calcium maleate)‐DS ( PVA/PMACa‐DS) hydrogels. Such hydrogels exhibit properties, showing tensile strengths up 15 MPa, due presence strong hydrogen bonding especially ionic bonding. The PVA/PMACa‐DS varied emission colors from blue yellow‐green upon excitation 312–400 nm light, maximum lifetime 13.4 ms. Experiments theoretical calculations demonstrate that crosslinking between Ca 2+ nonconventional chromophores prevents contact molecules hence restricts nonradiative decay, leading RTP emission. This work provides reliable strategy for designing based on nonaromatic polymers emerging

Язык: Английский

Процитировано

26
Room temperature phosphorescence materials based on small organic molecules: Design strategies and applications DOI Creative Commons
Meixia He, C. G. Ding, Hexiang Guo

и другие.

Deleted Journal, Год журнала: 2024, Номер 2(3)

Опубликована: Июль 23, 2024

Abstract Room‐temperature phosphorescence (RTP) materials have attracted significant attention due to their applications in various fields such as information storage and encryption, organic light‐emitting diode (OLED), sensing, lighting display, biological imaging, photodynamic therapy. Traditionally, RTP can be efficiently developed using inorganic systems with noble metals or rare earth elements. Recently, many efforts been devoted the development of based on small molecules. The strategies construct include hydrogen bonding, heavy atom effect, n –π* transitions, π–π stacking, donor–acceptor host–guest doping. Herein, we summarize recent examples molecules primarily focusing design properties. Moreover, promising OLED, well bio‐imaging phototherapy are discussed. challenges perspectives given provide inspiration toward future materials.

Язык: Английский

Процитировано

15