INORGANIC CHEMISTRY
·
2025
·
IF 4.7
Zhaohui Huang,Xiaoli Wang,Peng Du,Chuanqi Feng,Ping Niu,Dongmei Xu,Lumin Wang,Wei Gao,Aixin Song
Manganese(II) halides have received a booming development owing to their flexible structures and remarkable optical properties, whereas those with multimode luminescence color changes under specific stimuli are rarely reported. In this study, we synthesized a zero-dimensional (C5H14NO)2MnBr4 single crystal, which experiences an order–disorder phase transition from P21/c to P2/m at 268 K. Intriguingly, the emission color of (C5H14NO)2MnBr4 exhibits a “symmetric” switching of green–yellow–orange–red–orange–yellow–green within the temperature range of 80–420 K. For the low-temperature phase (LTP) below 268 K, the green and red lights at 510 and 640 nm are derived from the d–d electron transition of Mn(II) and the emission of self-trapped excitons (SETs), respectively. For the high-temperature phase (HTP) above 268 K, the dual emission peaks at 530 and 640 nm can be attributed to the simultaneous existence of trapping and detrapping processes of the STEs. Taking advantage of the unique thermochromic behaviors of (C5H14NO)2MnBr4, the temperature-responsive anticounterfeiting labels and encryption codes with multilevel design and high security have been constructed. This work provides new insights for the preparation of metal halides with multiple luminescence performances, facilitating the development of anticounterfeiting and information protection technologies.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
DYES AND PIGMENTS
·
2018
·
IF 3.767
Xueyan Wu,Jixi Guo,Jianzhang Zhao,Yuanyuan Che,Dianzeng Jia,Yi Chen
The development of organic single-molecule multiple photoluminescence compounds hold a great promise for advanced opt-electronic devices, optical probes and temperature sensors . The pyrenyl-substituted o -carborane, CSP and CDP , were obtained via a modified nickel-catalyzed cross-coupling reaction in satisfactory yields. Based on variety of spectroscopic measurements, it was found that the CSP and CDP exhibit multifunctional luminescent properties, such as dual emissions as well as thermochromic luminescence between orange and blue for CSP , ternary species emissions for CDP , and aggregation induced emission (AIE) and AIE enhancements (AIEE) properties for both. The origination of the multiple photoluminescence attributes was investigated deeply. We demonstrated that the multiple photoluminescence in the pyrenyl-substituted o -carborane rose from the electronic interaction between pyrenyl and o -carboranyl leading to the formation of ICT state, and the mono-molecular excimer emission attributed to the interaction between the conformational of two “face−to−face” pyrene chromophores . In addition, clear thermochromic luminescence properties were caused by ICT at room temperature and excimer formation at 77 K in the solid state. The results are useful as a guideline for designing luminescent solid materials with multiple photoluminescence and thermochromic luminescence properties.
研究领域:
材料科学
·
光化学
·
有机化学
✓ 已验证
DOI
高影响因子
INORGANIC CHEMISTRY
·
2022
·
IF 5.436
Zhi-Cheng Zhang,Tie Zhang,Chang-Yuan Su,Meng-Meng Lun,Yi Zhang,Da-Wei Fu,Qi Wu
Lead-free Halides, especially Mn-based ones, are preferred as hotspots in the exploration of photoluminescent materials. However, there are few reports on sensitive reversible thermochromism and switchable dual emission originating from self-trapped exciton emission in pure Mn-Based materials. Here, we report a new Mn-based hybrid material [TMPA]2MnI4 (TMPA = trimethylphenylammonium), which shows two emission peaks at 545 and 660 nm benefitting from the d–d orbital transition of Mn2+ and the generation of self-trapped excitons, respectively. Due to the different sensitivity to temperature, the stages of thermal activation and thermal quenching of the two emission types are also inconsistent, showing a certain competition relationship and dominating the emission colors in different temperature ranges, resulting in adjustable green–orange–green thermochromic luminescence from 100 to 403 K (both high and low temperatures correspond to green, and orange is displayed at near room temperature). Therefore, thermochromic luminescence can be easily achieved by controlling the temperature under the guidance of excited states. This work provides new insights into the synthesis and application of thermochromic materials. Therefore, it is certain that regulating temperature while being guided by excited states will achieve thermochromic luminescence. This research offers fresh perspectives on the development and potential of thermochromic materials.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
Materials Advances
·
2023
·Vol. 4
·期 16
·3645-3653
·
IF 5
Nengni Xu,Wenhua Xu,Meng Sun,Yi Yuan,Xinjun Luan,Ying Wang,Hui Wang
Strategic structure designs to develop organic multi-stimuli-responsive fluorescent materials are highly desired, but hard to achieve. We report here a novel multi-stimuli responsive luminescent material TXENE (1,2-di(9H-thioxanthen-9-ylidene)ethane) composed of double thioxanthene chromophores and a diene liker that integrate polymorphism, aggregation-induced emission (AIE), mechanoluminescence (MCL), thermoresponsive luminescence (TCL), and triboluminescent (TL) properties into one single molecule. Three crystalline polymorphs including TXENE-G and TXENE-Y with a terminal up–down conformer and TXENE-R with an up–up form are obtained. The X-ray structure analysis revealed that not only the intermolecular interactions but also the terminal chromophore-thioxanthene conformation (up–down vs. up–up) dominate polymorphism, thus leading to distinct luminescent properties. It is shown that MCL, TCL and TL properties can be systematically tuned via its aggregation state regulation; typically, the metastable TXENE-G and TXENE-R are MCL and TCL active, while TXENE-Y is TL active. Lastly, we illustrate the possible application of color-changeable indicators for information anti-counterfeiting and thermal sensing by using TXENE. This study demonstrates that multiple unique functions can be integrated into one single compound by fine controlling its aggregation states, which render a new strategy for the investigation of multifunctional organic materials.
研究领域:
材料科学
·
有机化学
✓ 已验证
产品关联
DOI
高影响因子
OPTICAL MATERIALS
·
2025
·
IF 4.2
Aihua Zhou,Chengguo Ming,Yumiao Pei,Yuanxue Cai,Tingting Guo,Hanbo Li
Reasonable modulation of temperature-dependent luminescence color has attracted significant attention due to its promising applications in anti-counterfeiting and temperature sensing. Although research on thermochromic materials is growing, the detailed exploration of the causes remain insufficiently explored. In this study, we successfully synthesized SrMoO 4 :Tb/Eu samples exhibiting thermal-responsive color tuning. Under 280 nm excitation, the intensity ratio of Eu 3+ ( 5 D 0 → 7 F 2 ) to Tb 3+ ( 5 D 4 → 7 F 5 ) in SrMoO 4 :0.08Tb/0.12Eu gradually increases from 0.81 to 5.8 over the temperature range of 303K–573K, accompanied by a distinct color shift from red to yellow. Experimental investigations demonstrated that the thermochromic behavior of the sample is primarily governed by nonradiative relaxation rates and local site symmetry. These results indicated that the samples can have potential for anti-counterfeiting and temperature sensing, particularly suitable as temperature sensing in the high-temperature reactor observation window.
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Jiale Zhang,Chengyue Xin,Ming Ma,Wenjun Zhang,Zihan Chen,Ying Gao,Dan Wang
Conventional materials with single emission centers face limitations in emission tunability and anti-counterfeiting security. Thermochromic-induced reversible luminescence modulation offers an effective approach for multi-level optical encryption. In this work, we demonstrate an information‐encryption strategy based on a vacancy-ordered perovskite that undergoes reversible, delayed luminescence shifts. Blue-emitting Bi 3+ -doped Cs 2 ZrCl 6 crystals were synthesized via a facile precipitation method and exhibit dual emission centers under different excitations. Under 365 nm excitation, the Bi 3+ emission at 465 nm undergoes a thermochromic‐induced red shift to 500 nm upon annealing at 110–180 °C; this visibly distinct green state persists for seven days at room temperature and fully reverts to blue over ≈40 days. In contrast, the intrinsic Cs 2 ZrCl 6 self-trapped-exciton emission at 254 nm excitation remains constant, providing an internal reference for enhanced anti-counterfeiting security. Comprehensive photoluminescence and UV–Vis diffuse-reflectance analyses reveal that annealing modulates the band gap via Bi 3+ -induced intermediate states, thereby driving the reversible emission shift without altering crystal structure or oxidation states. By incorporating the Bi 3+ -doped Cs 2 ZrCl 6 powder into conventional screen-printing ink (5:1 mass ratio), we fabricate nearly invisible security patterns that switch from blue to green under 365 nm UV after heating and automatically recover, enabling multi-cycle thermal encryption. This study not only elucidates the band-gap–mediated mechanism of thermochromic luminescence in lead-free perovskites but also establishes a versatile platform for next-generation, reversible optical security and anti-counterfeiting applications.
研究领域:
材料科学
·
光学物理
·
纳米技术
·
固态化学
·
信息安全
✓ 已验证
产品关联
DOI
高影响因子
CHINESE JOURNAL OF STRUCTURAL CHEMISTRY
·
2025
·
IF 10.3
Hong-Zhao Zan,Hai-Xin Zhao,Xi-Gui Gao,Xiao-Zhong Wang,Yun-Zhi Zhu,Guo-Kun Li,Xu-Yang Yao,Chen Li,Xiang-Wen Kong,Xiao-Wu Lei
Stimuli-responsive luminescent switching materials with multifunctional properties are highly essential for advanced photonic applications, yet achieving such capabilities in halide perovskites continues to pose a significant challenge. In this work, we explore a new water-stimuli-responsive zero-dimensional (0D) Sb-based halide of [PhPz] 2 SbCl 7 ·2H 2 O (PhPz = phenylpiperazine), which is consist of isolated [SbCl 6 ] 3- octahedra in [PhPz] 2+ cationic matrix with guest H 2 O molecules. Under UV excitation, [PhPz] 2 SbCl 7 ·2H 2 O emits intense broadband red light with maximum emission at 645 nm, and combined optical characterization and theoretical calculations confirm that this luminescence originates from self-trapped excitons (STEs). Interestingly, the free water molecules can reversibly leave and entry the crystal lattice during heating-cooling cycles accompanied by formation of dehydrated phase, which displays strong yellow emission with maximum peak at 580 nm. Therefore, reversible luminescent switching between red and yellow emission is achieved through controllable removal and adsorption process of guest H 2 O. By virtue of this reversible thermochromic switching, this halide can be used to detect trace amount of water in various organic solvents and humidity of moist air. In addition, this switchable dual emission further realizes application in anti-counterfeiting and information encryption-decryption. This work deepens the understanding of structure-property relationships and expands the application range of 0D metal halides.
研究领域:
材料化学
·
光物理学
·
分析化学
·
功能材料
·
传感器技术
·
防伪科学
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED MATERIALS
·
2025
·
IF 26.8
Na Lin,Li Xiao,Yishi Wu,Yi-Fan Wu,Zi-Xian Li,Tian-Yu Yan,Zhi-Wei Chen,Cheng-Yang Yue,Dongpeng Yan,Xiao-Wu Lei
Excitation- and temperature-dependent multicolor luminescent materials are valuable in advanced optoelectronic devices while they haven't been realized in 2D metal halides owing to the restrictions of Kasha's rule. Herein, we reported a novel 2D lead-free halide of (AMP) 2 Cu 2 Br 4 (AMP = N-aminomorpholine) through structural engineering, in which the [Cu 2 Br 4 ] 2− layer is composed of corner- and edge-shared [CuBr 4 ] tetrahedron. The non-centrosymmetric structure enables (AMP) 2 Cu 2 Br 4 to exhibit an impressive second-harmonic generation signal of ≈0.8 times that of KH 2 PO 4 (KDP). Remarkably, (AMP) 2 Cu 2 Br 4 possesses two independent self-trapped exciton-emitting states under different excitation energies, which display multicolor luminescence outputs from blue, white, to orange with near-unity photoluminescence quantum yields (PLQYs). Additionally, the luminescence can be regulated in a wide temperature range of 300–400 K due to reversible energy transfer between two emitting bands, acting as a luminescence ratio thermometer with a ultrahigh relative thermal sensitivity of 56.755% K −1 . High PLQY and large Stokes shift further endow (AMP) 2 Cu 2 Br 4 strong radioluminescence with an ultrahigh light yield of 92,400 photons·MeV −1 , low detection limit of 121 n Gy air ·s −1 and a short afterglow of 0.41 m s. The abundant photophysical properties highlight the multiple optoelectronic applications of 2D cuprous halide in white light-emitting, laser technology, flexible temperature sensors, and X-ray imaging.
研究领域:
材料科学
·
光电子学
·
凝聚态物理
·
无机化学
·
功能材料
·
辐射探测
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Laser & Photonics Reviews
·
2025
·
IF 10
Linyuan Lian,Daming Xiong,Jibin Zhang,Mochen Jia,Ying Liu,Zhuangzhuang Ma,Xu Chen,Yanbing Han,Yongtao Tian,Xinjian Li,Jianbing Zhang,Peng Zhang,Zhifeng Shi
Thermochromic luminescent materials with reversible phase transition and photoluminescence (PL) switching hold promise for stimulus-response systems and optical encryption, but usually suffer from low photoluminescence quantum yield (PLQY), limited switching reversibility, and severe thermal quenching. Here, a novel pair of 0D hybrid copper halide isomers, α- and β-(ETPA) 2 Cu 2 I 4 (ETPA = ethyltripropylammonium) is reported, which exhibit a reversible structural phase transition and PL color switching upon heating or cooling treatment. At 298 K, α-(ETPA) 2 Cu 2 I 4 displays a single band blue emission with a near-unity PLQY. Upon heating treatment, an additional thermally-activated low-energy emission band appears ≈650 nm, resulting in a dual-band yellow emission. Conversely, this yellow emission can gradually revert to the original blue emission during a cooling process. The dynamic interconversion process between these two isomers is monitored using in situ optical and structural measurements, revealing that there are two self-trapped emitting states in [Cu 2 I 4 ] 2− dimers, whose populations are strongly dependent on the surrounding molecular environment and the thermal activation energy. Moreover, the robust structural and optical reversibility over 45 cycles is demonstrated. Notably, the reversible PL switching in 0D hybrid copper halide isomers makes them promising candidates for applications in anti-counterfeiting and thermo-responsive scintillators.
研究领域:
材料科学
·
光物理学
·
无机化学
·
功能材料
·
光学加密
✓ 已验证
产品关联
DOI
高影响因子
Laser & Photonics Reviews
·
2024
·
IF 9.8
Wei Liao,Xinquan Zhou,Jiance Jin,Yuzhen Wang,Zhiguo Xia
Thermochromic luminescent materials (TLMs) with spectral responsiveness to thermal stimuli have received broad attention due to the forefront applications in temperature visualization and sensing technologies. Herein, a phase diagram-driven strategy for designing TLMs in Cs–Cd–Br ternary system is presented. The room temperature stable Cs 7 Cd 3 Br 13 crystal is first obtained by utilizing a facile hydrothermal method, and the self-trapped exciton (STE) luminescence is improved by breaking local symmetry via Mg 2+ doping. Then thermochromic luminescence is further realized in Mn 2+ co-doped Cs 7 Cd 3 Br 13 on the basis of reversible structural transition to metastable Cs 2 CdBr 4 under thermal stimuli. The emission color change from bright yellow to green benefits from the variation of crystal fields around Mn 2+ , which can be switched by heating and cooling circulations. Finally, the resulting material is used as a demo to visualize the temperature of a homemade high-frequency induction heating sintering platform.
研究领域:
材料科学
·
光学工程
·
温度传感技术
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Zhefu Wu,Qing Su,Jie Yang,Zhimei Wei,Gang Zhang
Particulate matter 2.5 (PM 2.5 ) has become a major threat to human lives. To minimize the adverse effect of high temperature PM 2.5 , the best way is to alert and filter out the PM 2.5 simultaneously. However, it remains a challenge to design filters with combined merits of high-performance, fire-retardancy and thermal response. In this work, we prepare the thermochromic luminous polysulfone membrane with high-temperature PM 2.5 filtration and alarming property. The dual luminous center containing covalent donor–acceptor (DA) structure and metal–ligand interaction are incorporated and electrospun into structure unified nanofibers. And different thermal responsiveness is observed for the dual luminous center. The high PM 2.5 filtration efficiency (99.1%), low pressure drops (98 Pa) and heat-resistant (T g > 236 °C) membrane can be directly applied on an in-situ high-temperature PM 2.5 filtration and monitoring device, with the emission color variable from red to cyan in a wide range. More importantly, PBN composite filters show excellent flame retardancy in comparison with the commercial PE fabrics, and the color indicating property functions well even under fire. Therefore, the PBN composite membrane holds great potential in the fields of high-temperature PM 2.5 filtration and fire alarming.
研究领域:
材料科学
·
环境科学
·
纳米技术
·
消防安全工程
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）