CHUNG-CHIH WULin, Y.T.Y.T.LinChiang, H.H.H.H.ChiangCho, T.Y.T.Y.ChoChen, C.W.C.W.ChenKEN-TSUNG WONGLiao, Y.L.Y.L.LiaoLee, G.H.G.H.LeeSHIE-MING PENG2018-09-102018-09-10200200036951http://www.scopus.com/inward/record.url?eid=2-s2.0-79955982647&partnerID=MN8TOARShttp://scholars.lib.ntu.edu.tw/handle/123456789/297458https://www.scopus.com/inward/record.uri?eid=2-s2.0-79955982647&doi=10.1063%2f1.1493669&partnerID=40&md5=1ecd8001f14547701c9734a880410397An efficient and morphologically stable pyrimidine-containing spirobifluorene-cored oligoaryl, 2,7-bis[2-(4-tert-butylphenyl)pyrimidine-5-yl]- 9,9′-spirobifluorene (TBPSF), as an emitter or a host for blue organic light-emitting devices (OLEDs), is reported. The steric hindrance inherent with the molecular structure renders the material a record-high neat-film photoluminescence (PL) quantum yield of 80% as a pure blue emitter (PL peak at 430 nm) of low molecular weight, and a very high glass-transition temperature (Tg) of 195°C. Blue OLEDs employing this compound as the emitter or the emitting host exhibit unusual endurance for high currents over 5000 mA/cm2. When TBPSF is used as a host for perylene in a blue OLED, maximal brightness of ∼80000 cd/m2 had been achieved, representing the highest values reported for blue OLEDs under dc driving. © 2002 American Institute of Physics.Blue OLEDs; High currents; Low molecular weight; Organic light-emitting devices; Perylenes; Pure blue; Spirobifluorene; Steric hindrances; Aromatic compounds; Glass transition; Light emission; Quantum yield; Current densityjournal article10.1063/1.14936692-s2.0-79955982647WOS:000176871600003