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Electroluminescence efficiency, triplet emitters

The triplet-harvesting mechanism was confirmed by efficiency analysis of the BIY device spectra. A blue fluorescent (BE) device was constructed similarly to the BIY except that the phosphorescent emitter was omitted. The blue portion of the spectrum (380-512 nm) of the BE device exhibits 4.9% EQE, indicating very efficient fluorescence. Figure 14.52 shows that devices B Y and BE have nearly identical spectral radiance for the blue component of the electroluminescence. Thus, fluorescence remained the same while the addition of the phosphorescent dopant to the BE device resulted in the appearance... [Pg.495]

The internal quantum efficiency is limited to 25% in fluorescent OLEDs due to spin statistics. With phosphorescent emitters both singlet- and triplet excitons contribute to the electroluminescence and hence the theoretical limit of the quantum efficiency rises to 100%. In 1999 Forrest and Thompson introduced the green... [Pg.200]

See other pages where Electroluminescence efficiency, triplet emitters is mentioned: [Pg.428]    [Pg.429]    [Pg.440]    [Pg.94]    [Pg.13]    [Pg.142]    [Pg.33]    [Pg.84]    [Pg.194]    [Pg.168]    [Pg.82]    [Pg.337]    [Pg.145]    [Pg.373]    [Pg.43]    [Pg.262]    [Pg.128]    [Pg.129]   
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