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Title: Benzobisoxazole cruciforms: A tunable, cross-conjugated platform for the generation of deep blue OLED materials

Four new cross-conjugated small molecules based on a central benzo[1,2-d:4,5-d']bisoxazole moiety possessing semi-independently tunable HOMO and LUMO levels were synthesized and the properties of these materials were evaluated experimentally and theoretically. The molecules were thermally stable with 5% weight loss occurring well above 350 °C. The cruciforms all exhibited blue emission in solution ranging from 433–450 nm. Host–guest OLEDs fabricated from various concentrations of these materials using the small molecule host 4,4'-bis(9-carbazolyl)-biphenyl (CBP) exhibited deep blue-emission with Commission Internationale de L'Eclairage (CIE) coordinates of (0.15 ≤ x ≤ 0.17, 0.05 ≤ y ≤ 0.11), and maximum luminance efficiencies as high as ~2 cd A–1. Lastly, these results demonstrate the potential of benzobisoxazole cruciforms as emitters for developing high-performance deep blue OLEDs.
 [1] ;  [2] ;  [1] ;  [3] ;  [2] ;  [4] ;  [3] ;  [1] ;  [2] ;  [1]
  1. Iowa State Univ., Ames, IA (United States)
  2. Ames Lab. and Iowa State Univ., Ames, IA (United States)
  3. Univ. of North Georgia, Dahlonega, GA (United States)
  4. Ames Lab. and Iowa State Univ., Ames, IA (United States); National Univ. of Science & Technology (NUST MISiS), Moscow (Russia)
Publication Date:
OSTI Identifier:
Report Number(s):
Journal ID: ISSN 2050-7526; JMCCCX
Grant/Contract Number:
AC02-07CH11358; 0116435; 0521063; 0849677; 1229354; 1413173
Accepted Manuscript
Journal Name:
Journal of Materials Chemistry. C
Additional Journal Information:
Journal Volume: 4; Journal Issue: 17; Journal ID: ISSN 2050-7526
Royal Society of Chemistry
Research Org:
Ames Laboratory (AMES), Ames, IA (United States)
Sponsoring Org:
Country of Publication:
United States