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Sensitized Luminescence of Pure and Doped NaNO 2 Single Crystals. II. Time‐Resolved Experiments and Preliminary Analysis
Author(s) -
Pufahl H.,
Köhler J.,
Schmidt Th.,
Schmid D.,
Kenkre V. M.
Publication year - 1987
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2221410130
Subject(s) - luminescence , exciton , dopant , crystal (programming language) , doping , nano , generalization , atomic physics , energy transfer , materials science , chemistry , molecular physics , condensed matter physics , physics , optoelectronics , computer science , programming language , mathematical analysis , mathematics , composite material
The fluorescence decay times of pure NaNO 2 and of NaNO 2 doped with KNO 2 are measured for varying temperature and dopant concentration. Both, time‐resolved and steady measurements are carried out and are found to be in agreement with each other. Energy transfer rates are deduced from the measurements and an attempt is made to interpret them with the help of a generalization of the standard sensitized luminescence theory which includes detrapping effects. The result of this attempt is a strong indication that the rates for trapping and detrapping in NaNO 2 are not interrelated via detailed balance and the conclusion drawn is that a deeper theoretical investigation is necessary to analyze the experiment quantitatively. However, a rough estimate of the singlet exciton hopping rate can be made, and is found to be in agreement with the results of an interpretation of the lineshape asymmetry. For triplet excitons in NaNO 2 , it is shown that it is natural to conclude that energy transfer is motion‐limited and that the motion is one‐dimensional, in agreement with expectations based on the crystal structure of NaNO 2 .