3-(9-Carbazolyl)carbazoles and 3,6-Di(9-carbazolyl)carbazoles as Effective Host Materials for Efficient Blue Organic Electrophosphorescence**

Summary of the physical properties of the carbazole monomer, oligomers,and other carbazole-based molecules. Compound T d [a][°C] T g [b][°C] k max, abs. [c][nm] k max, fluo. [d][nm] k max, phos. [e][nm] E singlet [f][eV] E triplet [g][eV]Cz – – 343 351 409 3.53 3.03BCz1 299 67 344 376 416 3.30 2.98BCz2 334 104 343 373 413 3.32 3.00BCz3 322 77 358 414 448 3.00 2.77TCz1 384 88 344 389 424 3.19 2.92TCz2 413 150 343 388 422 3.20 2.94CBP – 62 341 355 485 3.49 2.56mCP – 60 340 348 427 3.56 2.90SimCP – 101 [h] – – 427 [h] – 2.90 [h] [a] Temperature corresponding to a 5% weight loss in thermogravimetric analysis.[b] Glass-transition temperature determined by differential scanning calorimetry.[c] Absorption maximum in solutions (1×10 –5 in toluene). [d] Fluorescence peak insolutions (1×10 –5 in toluene). [e] Phosphorescence peak in solutions (1×10 in tolu-ene, 77 K). [f] Singlet energy estimated from the highest-energy fluorescence peak.[g] Triplet energy estimated from the highest-energy phosphorescence peak. [h] Prop-erties of SimCP were obtained from reference [7].

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