In 2013,Chen, Xu-Lin; Yu, Rongmin; Zhang, Qi-Kai; Zhou, Liu-Jiang; Wu, Xiao-Yuan; Zhang, Qing; Lu, Can-Zhong published 《Rational Design of Strongly Blue-Emitting Cuprous Complexes with Thermally Activated Delayed Fluorescence and Application in Solution-Processed OLEDs》.Chemistry of Materials published the findings.Recommanded Product: 20154-03-4 The information in the text is summarized as follows:
Strongly greenish-blue to blue emitting Cu-(NN)(POP)+ (POP = bis[2-(diphenylphosphino)phenyl] ether) complexes containing N-linked 2-pyridylpyrazolate diimine ligands [Cu(pypz)(POP)]BF4 (1), [Cu(pympz)(POP)]BF4 (2), and [Cu(pytfmpz)(POP)]BF4 (3) (pypz = 1-(2-pyridyl)pyrazole, pympz = 3-Me-1-(2-pyridyl)pyrazole, and pytfmpz = 3-trifluoromethyl-1-(2-pyridyl)pyrazole) were designed and synthesized. Their structural, electrochem., and photophys. properties were characterized. The complexes 1-3 exhibit high luminescence quantum yields (PLQYs) at room temperature both in N-saturated CH2Cl2 (≤45%) and in neat solid (≤87%), which are comparable to the reported highest values for the cuprous complexes. The temperature dependence of spectroscopic properties and emission decay behaviors reveal 2 thermally equilibrated emitting states. At temperatures <150 K, the lowest triplet state (T1) is the predominant emitting state resulting in the typical phosphorescence with the emission decay times in the order of hundreds of μs. At ambient temperature, the lowest singlet state (S1), which lies only ∼0.17-0.18 eV above the T1 state, is populated thermally and in turn generates efficient thermally activated delayed fluorescence (TADF), and the emission decay times are reduced dramatically to, e.g., 12.2 μs for 2. Solution-processed OLEDs containing 1-3 in the emissive layer demonstrated excellent device performances by taking advantage of the singlet harvesting mechanism, among which the electroluminescent device using 3 shows a peak external quantum efficiency (EQE) of 8.47%, a peak current efficiency (CE) of 23.68 cd/A, and a maximum brightness of 2033 cd/m2. Crystallog. data are given. The experimental process involved the reaction of 3-(Trifluoromethyl)-1H-pyrazole(cas: 20154-03-4Recommanded Product: 20154-03-4)
3-(Trifluoromethyl)-1H-pyrazole(cas: 20154-03-4) belongs to pyrazoles. Pyrazole derivatives have been reported to exhibit a wide range of applications in medicinal chemistry and pharmacology. A large number of drugs incorporating pyrazole structure have been utilized as partial agonists for nicotinic acid receptors, antidepressants, antimicrobial agents, antiviral agents, and antifungal agents solely or along with the combination of other structural motifs.Recommanded Product: 20154-03-4
Referemce:
Pyrazole – Wikipedia,
Pyrazoles – an overview | ScienceDirect Topics