DYES AND PIGMENTS
·
2022
·
IF 5.122
Yurong Guo,Yue Liang,Yanan Wang,Jingran Zhang,Chao Wang,Yan Sun,Xia Feng,Guangjiu Zhao
The BODIPY-Fluorene derivatives with an orthogonal conformation were prepared for the emission of efficient phosphorescence. The derivatives show visible light absorption (497–513 nm), high phosphorescence quantum efficiency (36.2%) and realize control of luminescence color from green to orange-red. Typical orthogonal conformation and smaller excited state (S 1 and T 4 ) energy gap (0.05 eV) are favorable for intersystem crossing (ISC) process. The calculation are carried out for rationalization between the photophysical properties and conformation of the BODIPY-Fluorene derivatives. We demonstrate that the conformational substitution positions and the distance between D-A are promising strategy to regulate the emission lifetime and quantum efficiency for BODIPY derivatives. Moreover, the ability to generate singlet oxygen was measured by photooxidation of 1,3-diphenylisobenzofuran (DPBF) by singlet oxygen ( 1 O 2 ) photosensitization . At the same time, the LED device displays bright orange-red emission. This work paves the way for further research into the design and application of such materials in advanced optics.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
Electronic Materials Letters
·
2018
·Vol. 14
·期 2
·89-100
·
IF 2.882
Ye Hua,Wu Hongyu,Chen Liangyuan,Ma Songhua,Zhou Kaifeng,Yan Guobing,Shen Jiazhong,Chen Dongcheng,Su Shi-Jian
Abstract A series of new small molecules based on symmetric electron-acceptor of 1,3,4-oxadiazole moiety or its asymmetric isomer of 1,2,4-oxadiazole unit were successfully synthesized and applied to solution-processable blue phosphorescent organic light-emitting diodes for the first time, and their thermal, photophysical, electrochemical properties and density functional theory calculations were studied thoroughly. Due to the high triplet energy levels ( E T , 2.82–2.85 eV), the energy from phosphorescent emitter of iridium(III) bis[(4,6-difluorophenyl)-pyridinate- N ,C2′]picolinate (FIrpic) transfer to the host molecules could be effectively suppressed and thus assuring the emission of devices was all from FIrpic. In comparison with the para-mode conjugation in substitution of five-membered 1,3,4-oxadiazole in 134OXD , the meta-linkages of 1,2,4-isomer appending with two phenyl rings cause the worse conjugation degree and the electron delocalization as well as the lower electron-withdrawing ability for the other 1,2,4-oxadiazole-based materials. Noting that the solution-processed device based on 134OXD containing 1,3,4-oxadiazole units without extra vacuum thermal-deposited hole/exciton-blocking layer and electron-transporting layer showed the highest maximum current efficiency (CE max ) of 8.75 cd/A due to the excellent charge transporting ability of 134OXD , which far surpassed the similar devices based on other host materials containing 1,2,4-oxadiazole units. Moreover, the device based on 134OXD presented small efficiency roll-off with current efficiency (CE) of 6.26 cd/A at high brightness up to 100 cd/m 2 . This work demonstrates different nitrogen and oxygen atom orientations of the oxadiazole-based host materials produce major impact on the optoelectronic characteristics of the solution-processable devices. Graphical Abstract
研究领域:
材料科学
·
光学
·
电子工程
✓ 已验证
DOI
高影响因子
JOURNAL OF PHYSICAL CHEMISTRY B
·
2023
·
IF 3.3
Meng Kou,Feng Qin,Yongda Wang,Xiyu Zhang,Zheng Hu,Zhiguo Zhang
Environmental heavy atoms can further enhance the room temperature phosphorescence (RTP) emissions of gadolinium-labeled hematoporphyrin monomethyl ether (Gd-HMME) by way of the external heavy atom effect (HAE). However, the macroscopic phosphorescence intensity covered the intrinsic effect of the environmental heavy atoms. In this study, a method of separating the external HAE from the total is performed, and a quantity to describe the intrinsic nature of external HAE is defined. The environmental Gd3+ concentration evolution of the phosphorescent transition rate (kP) is obtained by correlated absorption, emission, and time-resolved spectroscopy. The kP increases linearly with environmental Gd3+ concentration, while the intercept kP0 coincides with that of the internal HAE. The slope κ could be calculated, and it is a quantity free of the Gd3+ concentration and only relies on the type of environmental heavy atoms. In addition, the environmental Lu3+ exhibits similar functionality to Gd3+ in external HAE. Environmental Pd2+ quenches the phosphorescence intensity macroscopically, while it enhances the HAE intrinsically. Our method provides an alternative insight into the intrinsic nature of environmental heavy atoms.
研究领域:
化学
·
生物医学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
TRANSITION METAL CHEMISTRY
·
2015
·Vol. 40
·期 7
·723-732
·
IF 1.306
Xu Sheng-Xian,Wang Jing-Lan,Zhao Feng,Xia Hong-Ying,Wang Yi-bo
Three copper(I) complexes, [Cu(PimP)(POP)]PF 6 ( 1 ), [Cu(NimP)(POP)]PF 6 ( 2 ), and [Cu(AimP)(POP)]PF 6 ( 3 ) (PimP = 2-phenyl-1 H -imidazo[4,5-f][1,10]phenanthroline, NimP = 2-(2-naphthyl-1 H -imidazo[4,5-f]phenanthroline, AimP = 2-(9-anthryl)-1 H -imidazo[4,5-f]phenanthroline, POP = bis[2-diphenylphosphino]-phenyl)ether) have been synthesized and characterized. Investigations into the effects of the varying substituents on the structural, absorption, and emission characteristics of the corresponding complexes are presented. Complexes 1 and 2 exhibit similar photophysical properties with the weaker lowest lying MLCT absorption at λ > 400 nm and the phosphorescence 3 MLCT/ 3 LLCT emission in the range of 570–590 nm, whereas complex 3 shows different absorption and emission properties, in which the LLCT absorption band is overlapped with the structured absorption bands belonging to the characteristic peaks of the anthracene moiety, and the emitting excited state is described as the 3 LLCT character. Density functional theory and time-dependent density functional theory calculations were employed to rationalize the photophysical properties of the complexes.
研究领域:
配位化学
·
理论化学
·
材料科学
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry B
·
2016
·Vol. 5
·期 1
·123-133
·
IF 4.872
Jingwen Ma,Yun Zeng,Yongchun Liu,Daocheng Wu
Using 4,7-diphenyl-1,10-phenanthroline (DIP) as a main ligand and ethyl cyanoacrylate (ECA) as both an auxiliary ligand and a polymer skeleton, polymer iridium(III) complexes (DIP)2Ir(ECA) and their nanomicelles with aggregation-induced phosphorescence emission (AIPE) activity were synthesized. The morphology, chemical structure and composition of (DIP)2Ir(ECA) nanomicelles were characterized using transmission electron microscopy, size distribution/zeta potential analysis, nuclear magnetic resonance, and Fourier transform infrared spectroscopy. Their AIPE-active effects and double-stranded DNA (dsDNA) monitoring abilities were determined using phosphorescence spectroscopy using a spectrophotofluorometer. The results showed that (DIP)2Ir(ECA) nanomicelles had a good thermostability within 0–100 °C and their size distribution was 29.14 ± 1.46 nm. These nanomicelles showed AIPE-active effects and their phosphorescence intensity increased nearly 30-fold in water compared to in acetone. These nanomicelles could be used in AIPE-active intracellular imaging and dsDNA monitoring. Owing to the specific phosphorescence quenching that occurred when dsDNA encountered (DIP)2Ir(ECA) nanomicelles, thermostable (DIP)2Ir(ECA) nanomicelles could quickly detect dsDNA with high sensitivity and could be conveniently applied not only in monitoring DNA degradation in a wider pH range (specifically in an acidic environment), but also during PCR procedures. More importantly, both (DIP)2Ir(ECA) nanomicelles and immobilized DNase I could be recycled and utilized at least four times using our novel phosphorescence “quenching-recovery” dsDNA detection procedure. The polymeric (DIP)2Ir(ECA) nanomicelles were fast, sensitive, and convenient in monitoring dsDNA and could be recycled four times owing to their thermostability, indicating their great potential in biomedical and environmental applications.
研究领域:
生物医学
·
材料科学
·
分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
RSC Advances
·
2013
·Vol. 4
·期 2
·554-562
·
IF 2.562
Tianzhi Yu,Yan Cao,Wenming Su,Chengcheng Zhang,Yuling Zhao,Duowang Fan,Mingjun Huang,Kan Yue,Stephen Z. D. Cheng
A new iridium complex containing coumarin derivative as a cyclometalated ligand (1L) and a carbazole-functionalized β-diketonate (2L) as the ancillary ligand, namely, Ir(III)bis(3-(pyridin-2-yl)coumarinato-N,C4)(1-(9-butyl-9H-carbazol-3-yl)-4,4,4-trifluoro-butane-1,3-dionato-O,O) (Ir(1L)2(2L)), was synthesized. The crystal structure of Ir(1L)2(2L) was determined via combined wide angle X-ray diffraction (WAXD) and transmission electron microscopy (TEM), which showed π–π the interactions of Ir(1L)2(2L) molecules stacking along the crystal axes. The doped light-emitting diodes using this novel Ir(1L)2(2L) complex as the phosphorescent dopant were fabricated. At a Ir(1L)2(2L) concentration of 6.0 wt%, a green-yellow emitting OLED was achieved with a maximum external quantum efficiency (EQE) of 6.11% and a maximum luminous efficiency of 22.55 cd A−1 at the current density of 6.06 mA cm−2, and a maximum luminance of 6653 cd m−2 at 10.7 V. Furthermore, two reference complexes Ir(1L)2(acac) and Ir(1L)2(TTA) were also used as emitters to fabricate OLED devices with the same device configuration. The maximum luminous efficiency of Ir(1L)2(acac) doped device was measured to be 20.04 cd A−1 at 2.15 mA cm−2 (10.0 wt%), while the doped device of Ir(1L)2(TTA) had a maximum luminous efficiency of 16.59 cd A−1 at 1.36 mA cm−2. The better performances of Ir(1L)2(2L) doped devices could be largely attributed to an improved hole-transporting property due to the introduction of the carbazole moiety.
研究领域:
材料化学
·
光电材料
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MOLECULAR MODELING
·
2015
·Vol. 21
·期 12
·1-10
·
IF 1.736
Xu Shengxian,Wang Jinglan,Zhao Feng,Xia Hongying,Wang Yibo
Two copper(I) complexes [Cu(Pyz-Phen) 2 ]PF 6 (1) and [Cu(POP)(Pyz-Phen)]PF 6 (2) (Pyz-Phen = pyrazino[2,3- f ] [1, 10]phenanthroline, POP = bis[2-diphenylphosphino]-phenyl]ether) have been synthesized and characterized. The photophysical properties of these complexes in solution have been studied. The electronic absorption spectrum of complexes 1 exhibit the lowest-lying MLCT absorption band at 459 nm and high-energy ligand-based transitions at 275 nm, while that of complex 2 exhibits the MLCT/LLCT band at 400 nm and ligand π-π* band at 262 nm. In addition, both 1 and 2 show similar phosphorescence 3 MLCT/ 3 LLCT emissions with maximum emission wavelengths of 569 and 572 nm, respectively. Density functional theory (DFT) and time-dependent density functional theory (TDDFT) were employed to rationalize the photophysical properties of the complexes studied. The theoretical data confirm the assignment of the experimental absorption spectra and the nature of the emitting states.
Photophysical properties of copper(I) complexes containing pyrazine-fused phenanthroline ligands
研究领域:
化学
·
材料科学
·
理论计算
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Small
·
2024
·Vol. 20
·期 26
·2310226
·
IF 13
Zhongwei Man,Zheng Lv,Yangyang Cao,Zhenzhen Xu,Qing Liao,Jiannian Yao,Feng Teng,Aiwei Tang,Hongbing Fu
Organic afterglow materials have significant applications in information security and flexible electronic devices with unique optical properties. It is vital but challenging to develop organic afterglow materials possessing controlled output with multi-stimuli-responsive capacity. Herein, dimethyl terephthalate (DTT) is introduced as a strong proton acceptor. The migration direction of N─H protons on two compounds Hs can be regulated by altering the excitation wavelength (Ex) or amine stimulation, thereby achieving dual-stimuli-responsive afterglow emission. When the Ex is below 300 nm, protons migrate to S 1-2 DTT , where strong interactions induce phosphorescent emission of Hs , resulting in afterglow behavior. Conversely, when the Ex is above 300 nm, protons interact with the S 0 DTT weakly and the afterglow disappears. In view of amine-based compounds with higher proton accepting capabilities, it can snatch proton from S 1-2 DTT and redirect the proton flow toward amine, effectively suppressing the afterglow but obtaining a new redshifted fluorescence emission with Δλ over 200 nm due to the high polarity of amine. Moreover, it is successfully demonstrated that the applications of dual-stimuli-responsive organic afterglow materials in information encryption based on the systematic excitation-wavelength-dependent (Ex-De) behavior and amine selectivity detection.
研究领域:
材料科学
·
光学材料
·
刺激响应材料
·
信息加密
·
物理化学
✓ 已验证
DOI
高影响因子
Nature Communications
·
2024
·Vol. 15
·期 1
·1-10
·
IF 14.7
Fang Cao,Xu Chang,Zhang Wei,Zhou Meng,Tan Dong,Qian Lixia,Hu Daqiao,Jin Shan,Zhu Manzhou
Dual emission (DE) in nanoclusters (NCs) is considerably significant in the research and application of ratiometric sensing, bioimaging, and novel optoelectronic devices. Exploring the DE mechanism in open-shell NCs with doublet or quartet emissions remains challenging because synthesizing open-shell NCs is difficult due to their inherent instability. Here, we synthesize two dual-emissive M 1 Ag 13 (PFBT) 6 (TPP) 7 (M = Pt, Pd; PFBT = pentafluorobenzenethiol; TPP = triphenylphosphine) NCs with a 7-electron open-shell configuration to reveal the DE mechanism. Both NCs comprise a crown-like M 1 Ag 11 kernel with Pt or Pd in the center surrounded by five PPh 3 ligands and two Ag(SR) 3 (PPh 3 ) motifs. The combined experimental and theoretical studies revealed the origin of DE in Pt 1 Ag 13 and Pd 1 Ag 13 . Specifically, the high-energy visible emission and the low-energy near-infrared emission arise from two distinct quartet excited states: the core-shell charge transfer and core-based states, respectively. Moreover, PFBT ligands are found to play an important role in the existence of DE, as its low-lying π * levels result in energetically accessible core-shell transitions. This novel report on the dual-quartet phosphorescent emission in NCs with an open-shell electronic configuration advances insights into the origin of dual-emissive NCs and promotes their potential application in magnetoluminescence and novel optoelectronic devices.
研究领域:
纳米技术
·
材料科学
·
光电技术
·
化学
·
物理
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2023
·
IF 4.4
Feng Lu,Xinhuan Xu,Xingdong Zhu,Linxin Shen,Weizheng Wan,Min Hu
Room temperature phosphorescent (RTP) Carbon Dots have been capturing increasing attention in recent years, while building a general method to adjust the emission color of RTP carbon dots is still a big challenge. Herein we report a simple method that combine the carbon nanodots and dyes (R6G and DCF) in SiO 2 nanosphere to get a series of multicolor RTP nanodots (CD@SiO 2 @dye) with long lifetime in aqueous solution. Leverage on chitosan quaternary ammonium as matrix and diethylenetriamine as N-doping resource to form a cross-linked skeleton as a luminescent center (namely CD), and a rigid network is formed by silica encapsulation (CD@SiO 2 ) to restrict the non-radiative transition process to generate the phosphorescence. The CD-based composites, with 1.10 s green (503 nm) phosphorescence emission, serve as activator to stimulate the corresponding luminescence of organic dyes. Then, based on Förster resonance energy transfer (FRET) process from CDs (as donor) to organic dyes (as acceptor) under UV excitation, the CD@SiO 2 @R6G emit ultra-long lifetime (1.13 s) orange-yellow (570 nm) afterglow, and CD@SiO 2 @DCF emit ultra-long lifetime (1.20 s) yellow-green afterglow (530 nm). Furthermore, it also achieves RTP colors control when the ratio of CDs and the dyes changes, the ratio of green emission and dye’s emission activated by CDs will gradually change as well. These kinds of materials keep the inherent advantages of low toxicity and luminous stability, and achieve adjustable RTP color in aqueous solution. Our research provides a strategy to synthesize water-soluble long-life RTP CDs with adjustable color and lifetime.
研究领域:
材料科学
·
纳米技术
·
光化学
·
分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）