Article
Nanoscience & Nanotechnology
Renjie Chen, Yan Guan, Hailong Wang, Yan Zhu, Xin Tan, Ping Wang, Xueye Wang, Xinghe Fan, He-Lou Xie
Summary: In this study, a series of organic compounds with twisted electron donor-acceptor structures were successfully designed and synthesized, and then dissolved in MMA to realize single-molecular organic room-temperature phosphorescent materials with long lifetime. When grown into single crystals, multicolor-tunable afterglow was achieved at different delay times, showing promising applications in high-level anticounterfeiting.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Chemistry, Physical
Kikuya Hayashi, Kei Fukasawa, Takashi Yamashita, Shuzo Hirata
Summary: In this study, we report a rational design of triplet sensitizers to achieve high-efficiency red afterglow emission at room temperature. By synthesizing sensitizer and acceptor molecules with different conjugated substituents, we found that the long conjugated substituent greatly enhanced the phosphorescence resonance energy transfer (PRET) from the sensitizer to the acceptor, resulting in improved yield of red afterglow emission at room temperature.
CHEMISTRY OF MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Alexander C. Brannan, Nguyen Le Phuoc, Mikko Linnolahti, Alexander S. Romanov
Summary: The molecular design and crystal lattice structure of halobenzonitrile-carbazoles have been investigated to achieve persistent room-temperature phosphorescence (pRTP). The commercially available carbazole derivatives exhibit efficient organic phosphors with high quantum yield and long excited state lifetime. Meanwhile, the laboratory-synthesized carbazole derivatives demonstrate thermally activated delayed fluorescence. In-depth photophysical studies reveal that luminescence originates from the mixed locally excited state/charge transfer state.
FRONTIERS IN CHEMISTRY
(2023)
Article
Chemistry, Multidisciplinary
Deliang Wang, Junyi Gong, Yu Xiong, Hongzhuo Wu, Zheng Zhao, Dong Wang, Ben Zhong Tang
Summary: By doping organic materials with color-tunable and time-dependent long persistent luminescence, the encryption level can be improved, leading to promising applications in anti-counterfeiting.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Junbo Li, Xuepu Wang, Xiaoya Zhao, Xuefeng Chen, Shuhui Ding, Minjian Wu, Kaka Zhang
Summary: In this study, a simple and straightforward cascade reaction was reported to synthesize BF(2)bdk compounds with different functional groups. With the assistance of suitable organic matrices, these compounds can exhibit organic room-temperature phosphorescence with long lifetimes and intense afterglow, showing excellent performance in the fabrication of processable red afterglow materials.
CHINESE JOURNAL OF CHEMISTRY
(2022)
Article
Chemistry, Multidisciplinary
Yu-Juan Ma, Xiaoyu Fang, Guowei Xiao, Dongpeng Yan
Summary: This work demonstrates a novel approach to achieve photo-controllable persistent luminescence at the single crystal level by integrating long-lived room temperature phosphorescence and photochromism within metal organic frameworks. The resulting core-shell heterojunctions show unique properties through an epitaxial growth process.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2022)
Article
Chemistry, Multidisciplinary
Changfeng Si, Tao Wang, Abhishek Kumar Gupta, David B. Cordes, Alexandra M. Z. Slawin, Jay S. Siegel, Eli Zysman-Colman
Summary: Corannulene-derived materials have been extensively studied in energy storage and solar cells. However, their potential as emitters in light-emitting sensors and OLEDs has been largely unexplored. In this study, a family of multi-D-A motifs, TCzPhCor, TDMACPhCor, and TPXZPhCor, were developed by using corannulene as the acceptor and different donors. These materials exhibit multiple phosphorescence and show promise in temperature sensing and OLED applications.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Review
Chemistry, Applied
Xiangming Wang, Mengjiao Dong, Zijuan Li, Zepeng Wang, Fu-Shun Liang
Summary: Recently, the research on organic room-temperature phosphorescent materials (ORTP) and organic long persistent luminescence (OLPL) has gained significant attention in the fields of chemistry and material science. Although there have been many reports on high-efficiency ORTP and OLPL achieved through organic small molecule doping systems, the lack of clear molecular design principles and understanding of complex doping mechanisms hinders further development and practical applications. This mini-review summarizes the recent progress in ORTP and OLPL achieved through the doping system of organic small molecules, emphasizing the relationship between molecular structure and luminescent performance, and presents the current challenges and prospects for future development in this field.
Article
Chemistry, Multidisciplinary
Lan Yu, Zhisheng Gao, He Cheng, Xin Yan, Hengyu Cao, Guangyao Guo, Huanhuan Li, Ping Li, Runfeng Chen, Ye Tao
Summary: A feasible strategy is proposed to develop colorful circularly polarized organic ultralong room temperature phosphorescence (CP-OURTP) materials from a single-component chiral molecule by introducing a chiral unit into the phosphorescence chromophore. Time-dependent colorful CP-OURTP from yellow to green is obtained by changing the intensity ratios between inherent CP-OURTP and delayed emission at different delayed times. This study provides a potential platform to prepare circularly polarized material systems showing colorful luminescent properties.
Review
Chemistry, Analytical
N. Thejo Kalyani, Abhilasha Jain, S. J. Dhoble
Summary: The article provides an overview of the fundamental scientific principles and milestones in luminescence, emphasizing the importance of persistent phosphors in luminous paints. It discusses the use of lanthanides and their role in various luminescent applications. The article also reviews the synthesis, characterization, and recent advances in both inorganic and organic afterglow materials, particularly focusing on red/green/blue organic/inorganic/hybrid phosphorescent materials and novel long afterglow materials for green technology.
Article
Chemistry, Multidisciplinary
Xin Zheng, Yuanshan Huang, Wei Lv, Jianzhong Fan, Qidan Ling, Zhenghuan Lin
Summary: This study utilizes synergism between covalent and non-covalent bonds to fix an organic phosphor guest in a rigid inorganic framework, achieving efficient and ultralong room-temperature phosphorescence. By solid-phase synthesis, twelve heavy-atom-free composites are obtained, all of which exhibit highly efficient and persistent phosphorescent properties visible to the naked eye.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2022)
Article
Materials Science, Multidisciplinary
Yaguang Wang, Qikun Sun, Lingtai Yue, Jie Ma, Shou Yuan, Danfeng Liu, Haichang Zhang, Shanfeng Xue, Wenjun Yang
Summary: This study successfully synthesized organic crystals with ultralong room-temperature white light emission, which exhibits non-discoloring white afterglow with high photoluminescence efficiency. The crystal can be excited at wide wavelengths and shows unique luminescent properties.
ADVANCED OPTICAL MATERIALS
(2021)
Article
Chemistry, Inorganic & Nuclear
Hui Liu, Kun Zhang, Peng-Fu Gao, Jia-Hua Luo, Yu-Ying Jiang, Meng-Shu Zhou, Ting Li, Xue-Li Zhu, Hong-Ru Fu
Summary: Two Cd-based supramolecular coordination polymers with multiple luminescence emissions, including fluorescence and time- and temperature-dependent ultralong phosphorescence, have been successfully synthesized. One of the compounds exhibits a long-lived afterglow under ambient conditions, while the other shows nearly pure white-light emission. This is the first example of a luminescent coordination polymer with single-phase white-light emission and color-evolution RTP.
INORGANIC CHEMISTRY
(2022)
Article
Chemistry, Inorganic & Nuclear
Shanshan Zhao, Zhenbin Wang, Yuanying Lin, Bin Yu, Weisheng Liu
Summary: In this study, a rare earth single-doped material Mg2SnO4:Tb3+ with persistent luminescence, photo-luminescence, and photo-stimulated luminescence was synthesized, showing a distinction of emission color between different luminescence modes. This multimodal dichromatic luminescence has potential applications in the field of information security, as demonstrated by a multilevel encrypted strategy for anti-counterfeiting using chalks made from the obtained samples.
INORGANIC CHEMISTRY FRONTIERS
(2021)
Article
Chemistry, Physical
Shuang Wang, Yin-Jing Shi, Song Chen, Zhiqing Lin, Zhixin Jiang, Wei-Ming Liao, Jun He
Summary: In this study, an acid-base stable coordination polymer (1) was synthesized using mellitic acid and zinc ions through an organic solvent-free hydrothermal method. 1 possesses a tightly stacked structure and exhibits dual-emission peaks with blue luminescence and blue-green afterglow. Room temperature afterglow transition can be achieved through dehydration operation, and the emission spectra of 1 can be recovered by exposing it to water vapor. The LPL coordination polymer has potential applications in information encryption and anti-counterfeiting due to its unique characteristics.
CHEMISTRY OF MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Li Yuan, Qian-Jun Ding, Zhen-Long Tu, Xiang-Ji Liao, Xu-Feng Luo, Zhi-Ping Yan, Zheng-Guang Wu, You-Xuan Zheng
Summary: Two pairs of Pt(II) enantiomers with good circularly polarized luminescence and tunable dissymmetry factors were successfully synthesized by using (RR)/(SS)-1,2-diphenylethane-1,2-diamine as carbon chiral sources. This method ingeniously avoids the formation of racemic mixture and chiral separation, and significantly improves the dissymmetry factors through the chirality originating from both chiral carbon centres and helicene-like structure.
CHINESE CHEMICAL LETTERS
(2022)
Article
Materials Science, Multidisciplinary
Jia-Jun Hu, Xu-Feng Luo, Yi-Pin Zhang, Meng-Xi Mao, Hua-Xiu Ni, Xiao Liang, You-Xuan Zheng
Summary: This study developed a simple molecular design strategy to prepare two novel highly efficient multi-resonance thermally activated delayed fluorescence materials, which exhibit green emission, small emission bandwidths, and high photoluminescence quantum yields. In organic light-emitting diodes, these materials showed good external quantum efficiencies and small efficiency roll-offs.
JOURNAL OF MATERIALS CHEMISTRY C
(2022)
Article
Materials Science, Multidisciplinary
Sheng-Yi Yang, Qi-Sheng Tian, Xiang-Ji Liao, Zheng-Guang Wu, Wan-Shan Shen, You-Jun Yu, Zi-Qi Feng, You-Xuan Zheng, Zuo-Quan Jiang, Liang-Sheng Liao
Summary: This study presents the first ever circularly polarized thermally activated delayed fluorescence molecule with a carbonyl-/sulfone-bridged triarylamine structure. Circularly polarized light emission is achieved through intramolecular steric hindrance and intramolecular space charge transfer. The molecule exhibits good quantum yield and clear circularly polarized luminescence in solution.
JOURNAL OF MATERIALS CHEMISTRY C
(2022)
Article
Chemistry, Multidisciplinary
Yi-Pin Zhang, Meng-Xi Mao, Shi-Quan Song, Yi Wang, You-Xuan Zheng, Jing-Lin Zuo, Yi Pan
Summary: In this study, we introduce the first circularly polarized white organic light-emitting diodes (CP-WOLEDs) based on all thermally activated delayed fluorescence (TADF) materials. These CP-OLEDs exhibit excellent device performances and warm white emission.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2022)
Article
Materials Science, Multidisciplinary
Xu-Feng Luo, Hua-Xiu Ni, An-Qi Lv, Xiao-Kang Yao, Hui-Li Ma, You-Xuan Zheng
Summary: This study demonstrates a simple strategy to achieve boron/nitrogen-based polycyclic heteroaromatic emitters with narrowband emission by tuning the coordination between B/N and heteroatom (O or S), resulting in improved photo-physical properties. These emitters show high external quantum efficiency in OLEDs and exhibit low-efficiency roll-off.
ADVANCED OPTICAL MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Zhi-Ping Yan, Li Yuan, Yuan Zhang, Meng-Xi Mao, Xiang-Ji Liao, Hua-Xiu Ni, Zhi-Heng Wang, Zhongfu An, You-Xuan Zheng, Jing-Lin Zuo
Summary: The realization of luminescent materials with narrowband and circularly polarized luminescence is achieved through a dual-core strategy, resulting in enhanced transition oscillator strength and ultrapure blue emissions.
ADVANCED MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Xiang-Ji Liao, Dongdong Pu, Li Yuan, Jingjing Tong, Shuai Xing, Zhen-Long Tu, Jing-Lin Zuo, Wen-Hua Zheng, You-Xuan Zheng
Summary: Chiral boron/nitrogen doped multiple resonance thermally activated delayed fluorescence (MR-TADF) emitters based on planar chiral paracyclophane exhibit high photoluminescence quantum yields and symmetric circularly polarized photoluminescence spectra in doped films. The sky-blue CP-OLEDs with (R/S)-Czp-tBuCzB show high external quantum efficiency and narrowest full-width at half-maximum among reported CP-OLEDs, while the devices with (R/S)-Czp-POAB display nearly pure green CP electroluminescence. These findings demonstrate the reliable strategy of incorporating planar chirality into MR-TADF emitters for efficient CP-OLEDs construction.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Chemistry, Multidisciplinary
Xu-Feng Luo, Hua-Xiu Ni, Liangjun Shen, Lejia Wang, Xunwen Xiao, You-Xuan Zheng
Summary: By inserting a tricoordinate B atom into an indolo[3,2,1-jk]carbazole precursor, a high-efficiency fused multiple resonance-induced thermally activated delayed fluorescence emitter was prepared, which exhibits narrowband emission and significant reverse intersystem crossing rate. The corresponding organic light-emitting diode shows an external quantum efficiency of 27.2% with a suppressed efficiency roll-off.
CHEMICAL COMMUNICATIONS
(2023)
Article
Materials Science, Multidisciplinary
Yong-Hui Zhou, Ai-Wei Zhang, Ru-Jun Huang, Yu-Hang Sun, Zhu-Jun Chen, Bai-Song Zhu, You-Xuan Zheng
Summary: Chiral luminescent materials have experienced rapid development in recent years due to their ability to emit circularly polarised luminescence (CPL) for various applications. In this study, three chiral copper(i) chloro-bridged dimers based on R/S-2,2'-bis(diphenylphosphino)-1,1'-binaphthalene ligands were conveniently synthesized with high yields. The dimers exhibited strong luminescence in powder form and doped films, and showed thermally activated delayed fluorescence characteristics. Additionally, the dimers displayed mirror symmetric circular dichroism and CPL spectra, and when used in circularly polarised organic light-emitting diodes (CP-OLEDs), achieved a high maximum external quantum efficiency of 21.7%.
JOURNAL OF MATERIALS CHEMISTRY C
(2023)
Article
Materials Science, Multidisciplinary
Xu-Feng Luo, Hua-Xiu Ni, Xiao Liang, Dezhi Yang, Dongge Ma, You-Xuan Zheng, Jing-Lin Zuo
Summary: In this study, a steric modulation strategy was employed to separate adjacent MR-TADF skeletons and suppress self-quenching and spectral broadening in organic light-emitting diodes (OLEDs). The introduction of a sterically hindered unit (N-phenylcarbazole) achieved face-to-face steric modulation between the non-conjugated benzene ring and the B/N skeleton. As a result, the p-1-PCzBN and m-1-PCzBN emitters-based OLEDs exhibited high external quantum efficiency (EQE) values and narrow full width at half maximum (FWHM) bands for electroluminescence (EL).
ADVANCED OPTICAL MATERIALS
(2023)
Article
Nanoscience & Nanotechnology
Longyan Zhang, Yishan Jin, Yike Wang, Wenjing Li, Zhenli Guo, Jingyu Zhang, Li Yuan, Chao Zheng, Youxuan Zheng, Runfeng Chen
Summary: This study presents a simple and universal approach to design efficient CPL organic afterglow materials by incorporating chiral chromophores into a nonconjugated clusterization-triggered emissive polymer and using aggregation engineering. High-performance CPL organic afterglow polymers with impressive figures-of-merit were achieved at room temperature, demonstrating potential applications in anticounterfeiting and reversible displays.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Chemistry, Multidisciplinary
Qi-Ming Liu, Li Yuan, Xiang-Ji Liao, Xiao-Sheng Zhong, Hua-Xiu Ni, Yu Wang, Yue Zhao, You-Xuan Zheng
Summary: Two iridium(iii) complexes incorporating the rigid indolo[3,2,1-jk]carbazole (ICz) unit and 2,2,6,6-tetramethyl-3,5-heptanedione (tmd) as an ancillary ligand were synthesized. The complexes exhibit green photoluminescence with high quantum yields. When doped into a bipolar host, the resulting films showed improved photoluminescence quantum yields and narrower emission spectra. Organic light-emitting diodes (OLEDs) based on these complexes demonstrated good performance characteristics, with one particular complex showing a maximum external quantum efficiency of 31.3% and a low efficiency roll-off. Overall, the study highlights the practicality and effectiveness of incorporating rigid ICz groups and nitrogen atoms into iridium(iii) complexes for achieving efficient OLEDs with narrow emission spectra and low efficiency roll-offs.
MATERIALS CHEMISTRY FRONTIERS
(2023)
Article
Materials Science, Multidisciplinary
Hongyang Li, Hao Yan, Lingqiang Meng, Xiaopeng Zhang, Changchun Kuang, Zhiming Meng, Yaowu He, Hong Xu, Xinkang Zhang, Youxuan Zheng, Chaoyi Yan, Hong Meng
Summary: This study successfully synthesized three blue MR-TADF emitters with exceptional properties, including large RISC rates, high PLQY, and a small FWHM value. The OLED displays utilizing one of these emitters demonstrated remarkable EQEs and CIE coordinates.
JOURNAL OF MATERIALS CHEMISTRY C
(2023)
Review
Chemistry, Inorganic & Nuclear
Yi-Pin Zhang, You-Xuan Zheng
Summary: Materials with circularly polarized luminescence have potential applications in circularly polarized organic light emitting diodes (CP-OLEDs), especially in 3D displays. Chiral phosphorescent metal complexes show outstanding device performance due to their ability to harvest both singlet and triplet excitons. This article briefly discusses the recent progress, challenges, and outlook of chiral phosphorescent metal complexes.
DALTON TRANSACTIONS
(2022)
Article
Materials Science, Multidisciplinary
Meng-Xi Mao, Shuai Xing, Yi-Ping Zhang, Zhong-Ze Qu, Li Yuan, Jia-Jun Hu, Xiang-Ji Liao, Yue Zhao, You-Xuan Zheng
Summary: Two new cyclometalated iridium(iii) complexes with different emission peaks were synthesized for OLEDs. One complex exhibited better performance and showed potential for efficient OLED applications.
JOURNAL OF MATERIALS CHEMISTRY C
(2022)