tailieunhanh - Organic Light Emitting Diodeedited by Marco MazzeoSCIYO Part 6

Tham khảo tài liệu 'organic light emitting diodeedited by marco mazzeosciyo part 6', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Nanocomposites for Organic Light Emiting Diodes 83 mentioned one can suggest that the increase in the PL intensity for such a composite film can be explained by the large absorption coefficient for TiO2 particles. Indeed this phenomenon would be attributed to the non-radiative FRET from TiO2 nanoparticles to polymer with excitation of wavelength less than 350 nm. Fig. 13. PL spectra of MEH-PPV nc-TiO2. Excitation beam with X 325 nm In figure 14 the PL spectra for the MEH-PPV and the composite films with excitation wavelength of 470 nm are plotted. In this case the MEH-PPV luminescence quenching was observed. For both samples the photoemission has two broad peaks respectively at nm and nm. The peak observed at nm is larger than the one at nm similarly to the electroluminescence spectra plotted in the work of Carter et al 1997 . As seen Petrella et al. 2004 for a composite in the presence of rod-like TiO2 nanocrystals PPV quenching of fluorescence is significantly high. This phenomenon was explained by the transfer of the photogenerated electrons to the TiO2. It is known Yang et al. 2005 that the fluorescence quenching of MEH-PPV results in charge-separation at interfaces of TiO2 MEH-PPV consequently reducing the barrier height at those interfaces. 3000 2500 TO. I 2000 o s 1 500 Cl 1 000 500 500 550 600 650 700 750 600 Wavelength nm . PL spectra of MEH-PPV nc-TiO2. Excitation beam with X 470 nm The effect of nanoparticles in composite films used for both the emitting layer EL and HTL in OLEDs was revealed by measuring the I-V characteristics of the devices made from different layers such as a single pure EL diode ITO MEH-PPV Al abbreviated as SMED a double pure polymer diode ITO PEDOT MEH-PPV Al or PPMD a double polymeric 84 Organic Light Emitting Diode composite layer diode where a MEH-PPV TiO2 composite was used as a EL and a PEDOT-composite film was used as a HTL ITO PEDOT TÌO2 MEH-PPV TÌO2 AI or PMCD and a multilayer OLED where a .

TỪ KHÓA LIÊN QUAN
crossorigin="anonymous">
Đã phát hiện trình chặn quảng cáo AdBlock
Trang web này phụ thuộc vào doanh thu từ số lần hiển thị quảng cáo để tồn tại. Vui lòng tắt trình chặn quảng cáo của bạn hoặc tạm dừng tính năng chặn quảng cáo cho trang web này.