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Inorganic‐organic Hybrid Structured LED's
Author(s) -
Gebauer T.,
Schmid G.
Publication year - 1999
Publication title -
zeitschrift für anorganische und allgemeine chemie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.354
H-Index - 66
eISSN - 1521-3749
pISSN - 0044-2313
DOI - 10.1002/(sici)1521-3749(199907)625:7<1124::aid-zaac1124>3.0.co;2-t
Subject(s) - polystyrene , chemistry , spin coating , diode , semiconductor , quantum yield , luminescence , doping , oled , layer (electronics) , analytical chemistry (journal) , materials science , polymer chemistry , coating , optoelectronics , fluorescence , optics , polymer , physics , organic chemistry
Three‐layered heterocontact light emitting diodes (LED's) were generated by spin‐coating processes. Perovskites of the type [C 6 H 5 (CH 3 )CHNH 3 ] 2 PbX 4 (X = Cl, Br) on ITO glass served as p‐semiconductors, while 1,3,5‐[5‐(4‐tert‐butylphenyl)‐2‐oxadiazyl]benzene (Starburst) in polystyrene was selected as the organic n‐semiconductor. As a zone for the electron‐hole recombination between p‐ and n‐semiconductor layer a poly(N‐vinylcarbazole)‐layer, doped with 3‐(2‐benzothiazolyl)‐7‐diethylamino‐coumarin (Coumarin6), as emitter molecule was used. A Mg : Ag electrode served as the cathode on the Starburst : polystyrene blend. Both diodes showed green luminescence at 7 V. The external quantum yield of the diode with the PbCl 4 2– perovskite was 0.4%, but only 0.06% for PbBr 4 2– . This is due to the different band structures of the layered perovskites.