Red, green, blue and white organic electroluminescent devices

Determination of the optical band gap of Alq3 and its derivatives for the use in two-layer OLEDs

“…The HOMO of the hole transporting layer (HTL) should be slightly above that of the ETL, so that holes can readily enter into the ETL, while the LUMO of the ETL should be significantly below that of the HTL, so that electron are confined in the ETL (Fig. 3(a)) [14,15]. It can be seen that the synthesized materials are not ideal candidates for OLED devices.…”

Effective blocking of the molecular aggregation of novel truxene-based emitters with spirobifluorene and electron-donating moieties for furnishing highly efficient non-doped blue-emitting OLEDs

“…red (R), green (G), and blue (B). [1][2][3][4] For the lighting purpose, the blue fluorescent emitters can also be employed to combine with orange (O) emitters to produce white light through O-B complementary colors in simplified device structures. [5][6][7] Through replacing the unstable phosphorescent (triplet) counterparts, blue fluorescent emitters can be used to construct white OLEDs (WOLEDs) to both guarantee high electroluminescent efficiencies via harnessing their unemissive triplet excitons by the long-wavelength triplet emitters and furnishing longer device life expectancy.…”

Electronic structure of NPB and BCP molecules probed by x-ray emission spectroscopy

“…Although the accurate determination of the HOMO and LUMO positions depends on the spectral resolution of the XAS and XES spectra, the resultant gap energies for NPB and BCP films are in fair agreement with previously published results. 5,15,16…”