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Os(II) Based Green to Red Phosphors: A Great Prospect for Solution‐Processed, Highly Efficient Organic Light‐Emitting Diodes
Author(s) -
Du BoSian,
Liao JiaLing,
Huang MingHong,
Lin ChengHuei,
Lin HaoWu,
Chi Yun,
Pan HsiaoAn,
Fan GangLun,
Wong KenTsung,
Lee GeneHsiang,
Chou PiTai
Publication year - 2012
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.201200718
Subject(s) - phosphor , materials science , oled , quantum efficiency , dopant , diode , optoelectronics , green light , octahedron , energy conversion efficiency , absorption (acoustics) , light emitting diode , fabrication , nanotechnology , doping , crystal structure , crystallography , chemistry , layer (electronics) , composite material , blue light , medicine , alternative medicine , pathology
Preparation and characterization of a new class of emissive Os(II) complexes ( 1 – 5 ) have been achieved using 3‐(thiazol‐2‐yl), 3‐(benzothiazol‐2‐yl), 3‐(imidazol‐2‐yl) and 3‐(benzimidazol‐2‐yl) azole chelates, together with the incorporation of one diphosphine ancillary for satisfying the octahedral coordination arrangement. The resulting Os(II) complexes, except for 5 , all show bright emission spanning visible region from green to saturated red, and their structural versus spectroscopic properties have been comprehended by absorption/emission together with computational approaches. Subsequently, a series of solution‐processed OLEDs using 1 – 4 as the dopant were successfully fabricated, demonstrating excellent device performances with external quantum efficiency (EQE) of 15%, current efficiency exceeding 48 cd/A, and power conversion efficiency up to 50 lm/W. Complex 4 is the only Os(II) based phosphor so far suitable for the fabrication of highly efficient green‐emitting OLEDs.