Ag(i) complex design affording intense phosphorescence with a landmark lifetime of over 100 milliseconds

2019 ◽  
Vol 48 (8) ◽  
pp. 2802-2806 ◽  
Author(s):  
Marsel Z. Shafikov ◽  
Rafał Czerwieniec ◽  
Hartmut Yersin
Keyword(s):  
Quantum Yield ◽  
Ambient Temperature ◽  
Decay Time ◽  
Pmma Matrix ◽  
Emission Decay ◽  
Complex Design ◽  
Emission Quantum Yield

A new Ag(i) complex was designed that shows an unprecedentedly long ambient temperature emission decay time of τ = 110 ms at an emission quantum yield of ΦPL = 50%, as measured for a doped PMMA matrix.

scholarly journals P∩N Bridged Cu(I) Dimers Featuring Both TADF and Phosphorescence. From Overview towards Detailed Case Study of the Excited Singlet and Triplet States

Molecules ◽  
2021 ◽  
Vol 26 (11) ◽  
pp. 3415
Author(s):  
Thomas Hofbeck ◽  
Thomas A. Niehaus ◽  
Michel Fleck ◽  
Uwe Monkowius ◽  
Hartmut Yersin
Keyword(s):  
Quantum Yield ◽  
Decay Time ◽  
Relaxation Times ◽  
Lattice Relaxation ◽  
Photo Luminescence ◽  
Delayed Fluorescence ◽  
Spin Lattice Relaxation ◽  
Zero Field ◽  
Triplet States ◽  
Spin Lattice

We present an overview over eight brightly luminescent Cu(I) dimers of the type Cu2X2(P∩N)3 with X = Cl, Br, I and P∩N = 2-diphenylphosphino-pyridine (Ph2Ppy), 2-diphenylphosphino-pyrimidine (Ph2Ppym), 1-diphenylphosphino-isoquinoline (Ph2Piqn) including three new crystal structures (Cu2Br2(Ph2Ppy)3 1-Br, Cu2I2(Ph2Ppym)3 2-I and Cu2I2(Ph2Piqn)3 3-I). However, we mainly focus on their photo-luminescence properties. All compounds exhibit combined thermally activated delayed fluorescence (TADF) and phosphorescence at ambient temperature. Emission color, decay time and quantum yield vary over large ranges. For deeper characterization, we select Cu2I2(Ph2Ppy)3, 1-I, showing a quantum yield of 81%. DFT and SOC-TDDFT calculations provide insight into the electronic structures of the singlet S1 and triplet T1 states. Both stem from metal+iodide-to-ligand charge transfer transitions. Evaluation of the emission decay dynamics, measured from 1.2 ≤ T ≤ 300 K, gives ∆E(S1-T1) = 380 cm−1 (47 meV), a transition rate of k(S1→S0) = 2.25 × 106 s−1 (445 ns), T1 zero-field splittings, transition rates from the triplet substates and spin-lattice relaxation times. We also discuss the interplay of S1-TADF and T1-phosphorescence. The combined emission paths shorten the overall decay time. For OLED applications, utilization of both singlet and triplet harvesting can be highly favorable for improvement of the device performance.

Improving the emission quantum yield in dinuclear Eu(III) and Tb(III) complexes with 2-fluorobenzoate.

2021 ◽  
Author(s):  
Ànnia Tubau ◽  
Laura Rodríguez ◽  
Ariadna L.azaro ◽  
Ramon Vicente ◽  
Merce Font-Bardia
Keyword(s):  
Quantum Yield ◽  
Water Mixture ◽  
Dinuclear Compounds ◽  
Emission Quantum Yield

The reaction of Ln(NO3)2·6H2O salts (Ln = Eu and Tb) with an excess of 2-fluorobenzoic acid (H-2FBz) in ethanol/water mixture allows the isolation of dinuclear compounds of formula [Ln2(-2FBz)4(2FBz)2(H-2FBz)2(H2O)2] (Ln...

Measurement of Emission Lifetime Dynamics and Biexciton Emission Quantum Yield of Individual InAs Colloidal Nanocrystals

Nano Letters ◽  
2014 ◽  
Vol 14 (12) ◽  
pp. 6787-6791 ◽  
Author(s):  
Thomas S. Bischof ◽  
Raoul E. Correa ◽  
Danna Rosenberg ◽  
Eric A. Dauler ◽  
Moungi G. Bawendi
Keyword(s):  
Quantum Yield ◽  
Colloidal Nanocrystals ◽  
Emission Lifetime ◽  
Emission Quantum Yield

Lighting up Eu3+ luminescence through remote sensitization in silica nanoarchitectures

2018 ◽  
Vol 6 (28) ◽  
pp. 7479-7486 ◽  
Author(s):  
Flavia Artizzu ◽  
Danilo Loche ◽  
Dimitrije Mara ◽  
Luca Malfatti ◽  
Angela Serpe ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Quantum Yield ◽  
Efficient Energy Transfer ◽  
Efficient Energy ◽  
High Emission ◽  
Fast Quenching ◽  
Emission Quantum Yield

Remote sensitization in hybrid organic–inorganic Eu3+-doped layered silica nanoarchitectures allows for unusually high emission quantum yield through efficient energy transfer and the removal of ultra-fast quenching effects of inner-shell emitters.

scholarly journals High Emission Quantum Yield Tb3+ -Activated Organic-Inorganic Hybrids for UV-Down-Shifting Green Light-Emitting Diodes

2020 ◽  
Vol 2020 (18) ◽  
pp. 1736-1742
Author(s):  
Sandra F. H. Correia ◽  
Ricardo L. Fernandes ◽  
Lianshe Fu ◽  
Mariela M. Nolasco ◽  
Luís D. Carlos ◽  
...  
Keyword(s):  
Quantum Yield ◽  
Light Emitting Diodes ◽  
Green Light ◽  
Light Emitting ◽  
High Emission ◽  
Emission Quantum Yield

scholarly journals On the validity of the ambipolar diffusion assumption in the polar mesopause region

2008 ◽  
Vol 26 (11) ◽  
pp. 3439-3443 ◽  
Author(s):  
A. P. Ballinger ◽  
P. B. Chilson ◽  
R. D. Palmer ◽  
N. J. Mitchell
Keyword(s):  
Ambient Temperature ◽  
Decay Time ◽  
Ambipolar Diffusion ◽  
Northern Sweden ◽  
Mesopause Region ◽  
Decay Times ◽  
Meteor Trail ◽  
Temperature And Pressure ◽  
Ion Recombination ◽  
Meteor Trails

Abstract. The decay of underdense meteor trails in the polar mesopause region is thought to be predominantly due to ambipolar diffusion, a process governed by the ambient temperature and pressure. Hence, observations of meteor decay times have been used to indirectly measure the temperature of the mesopause region. Using meteor observations from a SKiYMET radar in northern Sweden during 2005, this study found that weaker meteor trails have shorter decay times (on average) than relatively stronger trails. This suggests that processes other than ambipolar diffusion can play a significant role in trail diffusion. One particular mechanism, namely electron-ion recombination, is explored. This process is dependent on the initial electron density within the meteor trail, and can lead to a disproportionate reduction in decay time, depending on the strength of the meteor.

Experimental and theoretical study of ligand field, 4f–4f intensities and emission quantum yield in the compound Eu(bpyO2)4(ClO4)3

2001 ◽  
Vol 323-324 ◽  
pp. 654-660 ◽  
Author(s):  
O.L Malta ◽  
J Legendziewicz ◽  
E Huskowska ◽  
I Turowska-Tyrk ◽  
R.Q Albuquerque ◽  
...  
Keyword(s):  
Quantum Yield ◽  
Theoretical Study ◽  
Ligand Field ◽  
Emission Quantum Yield

scholarly journals Highly sensitive and precise optical temperature sensors based on new luminescent Tb3+/Eu3+ tetrakis complexes with imidazolic counterions

2020 ◽  
Vol 1 (6) ◽  
pp. 1988-1995
Author(s):  
Lucca B. Guimarães ◽  
Alexandre M. P. Botas ◽  
Maria C. F. C. Felinto ◽  
Rute A. S. Ferreira ◽  
Luis D. Carlos ◽  
...  
Keyword(s):  
Quantum Yield ◽  
Low Temperature ◽  
Temperature Sensors ◽  
Highly Sensitive ◽  
High Emission ◽  
Yield Values ◽  
Emission Quantum Yield

Precise optical temperature sensors based on luminescent Tb3+:Eu3+ tetrakis complexes with imidazolic counterions with high emission quantum yield values and low temperature uncertainty.

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