Aleksander Jabłoński

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Aleksander Jabłoński
A jablonski.jpg
Born 26 February 1898 (1898-02-26)
Woskresenówka, then Russian Empire, now Ukraine
Died 9 September 1980 (1980-09-10) (aged 82)
Skierniewice, Poland
Residence Poland
Citizenship Polish
Fields Physics - photoluminescence
Institutions Friedrich-Wilhelms-Universität
Nicolaus Copernicus University
Alma mater Kharkiv University
University of Warsaw
Known for Jablonski diagram

Professor Aleksander Jabłoński (born 26 February 1898 in Woskresenówka, in Imperial Russia, died 9 September 1980 in Skierniewice, Poland) was a Polish physicist and member of the Polish Academy of Sciences.

During the World War I he served in the Polish I Corps in Russia. After the war he settled in Warsaw in 1918. In the years of 1919-1920 he fought against Soviet Russia aggression against Poland (decorated with the Polish Cross of Valour).

Jabłoński initially studied the violin at Warsaw Conservatory, under the virtuoso Stanisław Barcewicz, but later switched to science.

He received a Ph.D. from the University of Warsaw in 1930, writing a thesis On the influence of the change of the wavelength of excitation light on the fluorescence spectra. Then he went to Friedrich-Wilhelms-Universität in Berlin, Germany for two years (1930–31) as a fellow of the Rockefeller Foundation. He was working with Peter Pringsheim at the FWU and later with Otto Stern in Hamburg. In 1934 Jabłoński returned to Poland to receive habilitation from the University of Warsaw. The habilitation thesis was On the influence of intermolecular interactions on the absorption and emission of light, the subject he would devote the rest of his life to.

Jabłoński was one of the pioneers of molecular photophysics, created the concept of the "luminescent centre" and own theories of concentrational quenching and depolarization of photoluminescence. He was also working on the pressure broadening of the emission spectra lines and was the first person to recognize the analogy between the pressure broadening and molecular spectra. This led to development of the quantum-mechanical pressure broadening theory.

Fluorescence is schematically illustrated with the classical Jablonski diagram, first proposed by Jabłoński in 1933[1] to describe absorption and emission of light.