Switching from sky blue to deep green fluorescent Zn(II) complexes for OLEDs applications

被引:13
|
作者
Lakshmanan, Raja [1 ]
Shivaprakash, N. C. [2 ]
Sindhu, S. [1 ]
机构
[1] Birla Inst Technol & Sci, Dept Phys, Pilani 333031, Rajasthan, India
[2] Indian Inst Sci, Dept Instrumentat & Appl Phys, Bangalore 560012, Karnataka, India
关键词
2,2 ':6 ',2 '-terpyridine ligands; Zn(II) complexes; Blue fluorescent OLEDs; Green fluorescent OLEDs; Photophysical and electrochemical properties; LIGHT-EMITTING-DIODES; INTRAMOLECULAR CHARGE-TRANSFER; METALLO-POLYMERS; ZINC-COMPLEXES; EXCITED-STATE; PERFORMANCE; EMISSION; DERIVATIVES; GENERATION; MOLECULE;
D O I
10.1016/j.jlumin.2017.12.031
中图分类号
O43 [光学];
学科分类号
070207 ; 0803 ;
摘要
Three new Zn(II) 4'-aryl substituted 2,2':6', 2'-terpyridine (terpy) complexes of the type [Zn(Ln)(2)]NO3 complexes (where, L-1 = 4'-(4-methylphenyl)-2,2':6', 2'-terpyridine, L-2 = 4'-(3,4,5-trimethoxyphenyl)-2,2':6', 2'-terpyridine, and L-3 = 4'-(2-thiophenyl)-2,2':6', 2'-terpyridine) were successfully synthesized and photophysical characterizations were done for OLEDs applications. The UV-visible absorption spectra of the complexes exhibited an intense absorption band in the range of 240-380 nm owing to a spin-allowed intraligand (pi-pi*) charge transition. The addition of an electron-donating aryl substituent into the terpy ligand within the complexes induced a significant red-shift of the spectrum. A solid state photoluminescence (PL) analysis revealed a transition from sky blue to green, while the complexes in the DMSO solution which possessed the most emissions appeared sky to deep blue, respectively. A cyclic voltammetry investigation of the complexes revealed a quasi-reversible reduction where the estimated electrochemical data concurred with theoretical calculations. Moreover, the complexes showed an optical band gap of 3.40-3.51 eV and a HOMO level from -6.64 to -6.47 eV. In addition, all the complexes depicted an excellent thermal stability. Hence, the presented complexes are promising candidates for blue and green fluorescent OLEDs application as electron transport as well as electroluminescent material.
引用
收藏
页码:136 / 145
页数:10
相关论文
共 50 条
  • [41] Rational design and characterization of heteroleptic phosphorescent iridium(III) complexes for highly efficient deep-blue OLEDs
    Feng, Yansong
    Zhuang, Xuming
    Zhu, Dongxia
    Liu, Yu
    Wang, Yue
    Bryce, Martin R.
    [J]. JOURNAL OF MATERIALS CHEMISTRY C, 2016, 4 (43) : 10246 - 10252
  • [42] Highly luminescent palladium(II) complexes with sub-millisecond blue to green phosphorescent excited states. Photocatalysis and highly efficient PSF-OLEDs
    Chow, Pui-Keong
    Cheng, Gang
    Tong, Glenna So Ming
    Ma, Chensheng
    Kwok, Wai-Ming
    Ang, Wai-Hung
    Chung, Clive Yik-Sham
    Yang, Chen
    Wang, Feng
    Che, Chi-Ming
    [J]. CHEMICAL SCIENCE, 2016, 7 (09) : 6083 - 6098
  • [43] Achieving Efficient Near-Ultraviolet/Deep-Blue OLEDs and Sensitized Narrowband Green/Yellow OLEDs Utilizing Emitters with Planarized Intramolecular Charge Transfer
    Chen, Tao
    Lou, Jingli
    Wu, Haozhong
    Luo, Juanjuan
    Yang, Dezhi
    Qiao, Xianfeng
    Zhang, Han
    Tang, Ben Zhong
    Wang, Zhiming
    [J]. ADVANCED OPTICAL MATERIALS, 2023, 11 (23)
  • [44] Green Synthesis of Self-Passivated Fluorescent Carbon Dots Derived from Rice Bran for Degradation of Methylene Blue and Fluorescent Ink Applications
    Vinoth Kumar Jothi
    Kavitha Ganesan
    Abirami Natarajan
    Arulmozhi Rajaram
    [J]. Journal of Fluorescence, 2021, 31 : 427 - 436
  • [45] Green Synthesis of Self-Passivated Fluorescent Carbon Dots Derived from Rice Bran for Degradation of Methylene Blue and Fluorescent Ink Applications
    Jothi, Vinoth Kumar
    Ganesan, Kavitha
    Natarajan, Abirami
    Rajaram, Arulmozhi
    [J]. JOURNAL OF FLUORESCENCE, 2021, 31 (02) : 427 - 436
  • [46] Two polyaminophenolic fluorescent chemosensors for H+ and Zn(II). Spectroscopic behaviour of free ligands and of their dinuclear Zn(II) complexes
    Ambrosi, Gianluca
    Battelli, Cristina
    Formica, Mauro
    Fusi, Vieri
    Giorgi, Luca
    Macedi, Eleonora
    Micheloni, Mauro
    Pontellini, Roberto
    Prodi, Luca
    [J]. NEW JOURNAL OF CHEMISTRY, 2009, 33 (01) : 171 - 180
  • [47] High performance blue- green and green phosphorescent OLEDs based on iridium complexes with N∧C∧N- coordinated terdentate ligands
    Chen, Dong
    Han, Liang
    Liu, Dong
    Ye, Kaiqi
    Liu, Yu
    Zhang, Jingying
    Wang, Yue
    [J]. RSC ADVANCES, 2015, 5 (24) : 18328 - 18334
  • [48] Synthesis of Fluorescent C2-Bridged Teraryls and Quateraryls for Blue, Sky-Blue, and Green Color Light-Emitting Devices
    Goel, Atul
    Sharma, Ashutosh
    Rawat, Madhu
    Anand, R. S.
    Kant, Ruchir
    [J]. JOURNAL OF ORGANIC CHEMISTRY, 2014, 79 (22): : 10873 - 10880
  • [49] Tetradentate Pt(II) Complexes with Peripheral Hindrances for Highly Efficient Solution-Processed Blue Phosphorescent OLEDs
    Zhu, Lu
    Sha, Chenwei
    Lv, Anqi
    Xie, Wang
    Shen, Kang
    Chen, Yumeng
    Xie, Guohua
    Ma, Huili
    Li, Hongbo
    Hang, Xiao-Chun
    [J]. INORGANIC CHEMISTRY, 2022, : 10402 - 10409
  • [50] Achieving phthalide-based fluorescent materials with hybridized local and charge-transfer characteristics for efficient deep blue OLEDs
    Feng, Zijun
    Liu, Futong
    Cheng, Zhuang
    Ge, Shuyuan
    Wang, Yaxue
    Yan, Zhenyu
    Ma, Xiaobo
    Wang, Yan
    Lu, Ping
    [J]. JOURNAL OF MATERIALS CHEMISTRY C, 2024, 12 (11) : 3881 - 3887