Radiative Lifetime, Non‐Radiative Relaxation, and Sensitization Efficiency in Luminescent Europium and Neodymium Cryptates – The Roles of 2,2′‐Bipyridine‐ N,N′ ‐dioxide and Deuteration | Zendy

Trautnitz Markus F. K. | Zendy; Doffek Christine | Zendy; Seitz Michael | Zendy

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Radiative Lifetime, Non‐Radiative Relaxation, and Sensitization Efficiency in Luminescent Europium and Neodymium Cryptates – The Roles of 2,2′‐Bipyridine‐ N,N′ ‐dioxide and Deuteration

Author(s) -

Trautnitz Markus F. K.,

Doffek Christine,

Seitz Michael

Publication year - 2019

Publication title -

chemphyschem

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.016

H-Index - 140

eISSN - 1439-7641

pISSN - 1439-4235

DOI - 10.1002/cphc.201900673

Subject(s) - europium , chemistry , luminescence , lanthanide , cryptand , neodymium , quantum yield , radiative transfer , inorganic chemistry , bipyridine , photochemistry , relaxation (psychology) , crystallography , materials science , crystal structure , organic chemistry , laser , optics , fluorescence , ion , physics , optoelectronics , social psychology , psychology

Five luminescent tris(bipyridine)‐based cryptates with the lanthanoids Eu and Nd have been prepared with a systematic increase in the number of 2,2′‐bipyridine‐ N,N′ ‐dioxide units and with different deuteration levels in the complexing cryptands for the europium species. Careful analysis of the radiative lifetime τ rad in these systems reveals that an increase in N ‐oxide units around the metal centers uniformly lowers τ rad by about 30–40 %. The potential involvement of nephelauxetic effects is discussed. Exchange of 30 C−D for C−H oscillators around the europium centers does not affect the radiative lifetimes but decreases non‐radiative deactivation and increases the overall luminescence quantum yield in D 2 O by 45 %.

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