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Hole-blocking layer characteristics

Figure 8.53 displays the output light power-current characteristics of LEDs with superstructures. Of these. Figure 8.53(a) compares the action characteristics of the two types of the superstructures which have DMQtT as the hole-blocking layer(s). Stracture B exhibits a larger differential coefficient than structure A. According to... [Pg.362]

The monopolar devices with predominantly hole current were constructed by placing a thin Alq layer between NPB layers, which act as hole-transport and electron-blocking layers. The nearly monopolar characteristic of such devices was confirmed by observing only weak electroluminescence, which also precluded using it to evaluate the extent of operational degradation. On the other hand, the differences in absorption spectra of Alq and NPB permitted the separate photoexcitation of the thin Alq layer with 442 nm Hg line. In situ measurements revealed continuously decreasing photoluminescence... [Pg.232]

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See also in sourсe #XX -- [ Pg.83 , Pg.84 , Pg.85 ]



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