【正文】 t by Addition of Branched Alcohol for Highly Efficient Electrophosphorescence[J]. Appl. Matter. interfaces, 2010, 2(4):10941099.[12] Lyu Y Y, Kwak J J, Lee C, et al. Highly efficient red phosphorescent OLEDs based on nonconjugated siliconcored spirobifluorene derivative doped with Ir plexes[J]. Adv. Funct. Mater., 2009, 19(3):420427.[13] Chien C H, Chuang C Y,Shu C F, et al. Novel host material for highly efficient blue phosphorescent OLEDs[J]. J. Matter. Chem, 2007, 17(17):16921698.[14] Chi Y, Chou P T. Transitionmetal phosphors with cyclometalating ligands: fundamentals and applications[J]. Chem. Soc. Rev, 2010, 39 (2):638655.[15] Wong W Y, Ho C L. Functional metallophosphors for effective charge carrier injection/transport: new robust OLED materials with emerging applications[J]. J. Matter. Chem, 2009, 19(26):44574482.[16] Holder E, Langeveld B M W, Schubert U S. New trends in the use of transition metalligand plexes for applications in electroluminescent devices[J]. Adv. Mater., 2005, 17(9):11091121.[17] Tsai M H, Ke T H, Lin H W. Triphenylsilyl and Trityl Substituted CarbazoleBased Host Materials for Blue Electrophosphorescence [J]. ACS Appl. Mater. Interfaces , 2009, 1(3):567574.[18] Gao Z Q, Luo M S, Sun X H, et al. New host containing bipolar carrier transport moiety for highefficiency electrophosphorescence at low voltages[J]. Adv. Mater., 2009, 21(6):688692.[19] Shirota Y, Kageyama H. Charge Carrier Transporting Molecular Materials and Their Applications in Devices[J]. Chem. Rev, 2007, 107 (4):9531010.[20] Liao Y L, Lin C Y, Wong K T, et al. A Novel Ambipolar Spirobifluorene Derivative that Behaves as an Efficient BlueLight Emitter in Organic LightEmitting Diodes[J]. Org. Lett., 2007, 9(22):45114514.[21] Fang J F, Ma D G. Efficient red organic lightemitting devices based on a europium plex[J]. Appl. Phys. Lett.,2003, 83(19):40414043.[22] Fang J F, You H, Ma D G. Improved efficiency by a fluorescent dye in red organic lightemitting devices based on a europium plex[J]. Chem. Phys. Lett.,2004, 392(13):1116.[23] Su S J, Gonmori E, Sasabe H, et al. Highly efficient organic blueand whitelightemitting devices having a carrier and excitonconfining structure for reduced efficiency rolloff[J]. Adv. Mater., 2008, 20(21):41894194.[24] Kim S H, Jang J, Lee J Y. Relationship between host energy levels and device performances of phosphorescent organic lightemitting diodes with triplet mixed host emitting structure[J]. Appl. Phys. Lett.,2007, 91(8):083511083513.[25] Lee J, Chopra N, Zheng Y, et al. Effects of triplet energies and transporting properties of carrier transporting materials on blue phosphorescent organic light emitting devices[J]. Appl. Phys. Lett.,2008, 93(8):123306123308.[26] Su S J, Takahashi Y, Kido J J, et al. Structureproperty relationship of pyridinecontaining triphenyl benzene electrontransport materials for highly efficient blue phosphorescent OLEDs[J]. Adv. Funct. Mater., 2009, 19(8):12601267.[27] Higginson K A, Zhang X M, Papadimitrakopoulos F. Thermal and Morphological Effects on the Hydrolytic Stability of Aluminum Tris(8Hydroxyquinoline) (Alq3)[J]. Chem. Mater., 1998, 10(4):10171020.[28] Adamovich V I, Cordero S R, Tamayo A, et al. New chargecarrier blocking materials for high efficiency OLEDs[J]. Org. Electron., 2003, 4 (23):7787.[29] Wang Q, Ding J Q, Ma D G, et al. Harvesting excitons via two parallel channels for efficient white organic LEDs with nearly 100% internal quantum efficiency: fabrication and emissionmechanism analysis[J]. Adv. Funct. Mater., 2009, 19(1):8495.[30] Xia H, Li M, Ma Y G, et al. Host selection and configuration design of electrophosphorescent devices[J]. Adv. Funct. Mater., 2007, 17(11):17571764.[31] Cai X Y, Vecchi P A, Burrows P E, et al. Electron and hole transport in a wide bandgap organic phosphine oxide for blue electrophosphorescence[J]. Appl. Phys. Lett.,2008, 92(8):083308083310.[32] Adachi C, Kwong R C, Forrest S R, et al. Endothermic energy transfer: A mechanism for generating very efficient highenergy phosphorescent emission in organic materials[J]. Appl. Phys. Lett.,2001, 79(13):20822084.[33] Tokito S, Iijima T, Suzuri Y, et al. Confinement of triplet energy on phosphorescent molecules for highlyefficient organic bluelightemitting devices[J]. Appl. Phys. Lett.,2003, 83(3):569571.[34] Jiang Z Q, Xu X C, Ma D G, et al. Diarylmethylenebridged 4,4′(bis(9carbazolyl))biphenyl: morphological stable host material for highly efficient electrophosphorescence[J]. J. Matter. Chem, 2009, 19(41):76617665.[35] He J, Liu H M, Ma D G, et al. Nonconjugated Carbazoles: A Series of Novel Host Materials for Highly Efficient Blue Electrophosphorescent OLEDs[J]. J. Phys. Chem. C, 2009, 113(16):67616767.[36] Whang D R, You Y M, Park S Y, et al. A highly efficient widebandgap host material for blue electrophosphorescent lightemitting devices[J]. Appl. Phys. Lett.,2007, 91(23):233501233503.[37] Seidler N, Reineke S, Leo K, et al. Influence of the hole blocking layer on blue phosphorescent organic lightemitting devices using 3,6di(9carbazolyl)9(2ethylhexyl)carbazole as host material[J]. Appl. Phys. Lett.,2010, 96(9):093304093306.[38] Wang K T, Chen Y M, Lin Y T, et al. Nonconjugated Hybrid of Carbazole and Fluorene: A Novel Host Material for Highly Efficient Green and Red Phosphorescent OLEDs[J]. Org. Lett., 2005, 7(24):53615364.[39] Wu M F, Chen C T, Wang J K, et al. The quest for highperformance host materials for electrophosphorescent blue dopants[J]. Adv. Funct. Mater., 2007, 17(12):18871895.[40] SaSabe H, Pu Y J, Kido J J, et al. mTerphenylmodified carbazole host material for highly efficient blue and green PHOLEDS[J]. Chem. Commun, 2009, (43):66556657.[41] Shih P I, Chien C H, Shu C F, et al. A novel fluorenetriphenylamine hybrid that is a highly efficient host material for blue, green, and redlightemitting elect