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Electron injection characteristics of a cathodic interface for an organic light emitting diode in a dark injection space-charge-limited current experiment
| Content Provider | Scilit |
|---|---|
| Author | Yin, Zhengyuan Zhu, Wenqing Wan, Minqiang Liu, Dan Wang, Mengdi Chen, Guo Li, Jun |
| Copyright Year | 2019 |
| Description | Journal: Journal of Physics D: Applied Physics The injection and transporting characteristics of Al/fluoride (or $Alq_{3}$: $Cs_{2}CO_{3})/Alq_{3}$/Al electron-only device is determined by the dark injection space-charge-limited current (DI-SCLC)method. The deviation from the ratio of peak current density $J_{DI}$ to the steady-state current density $J_{ss}$ for the ideal ohmic contact which should be 1.21 was obtained to compare the effects of modifications by four fluoride film and $Alq_{3}$ doped with $Cs_{2}CO_{3}$ on the injection of electrons. The value of $J_{DI}/J_{SS}$ ,1.29, for the device modified by 0.5nm LiF approaches to the ideal value of 1.21, confirming the formation of the quasic-ohmic contact between the organic layer and cathode,although the deviation increases significantly with the increase of film thickness. The value of $J_{DI}/J_{SS}$ for the device modified by NaF keeps stable within 1.6 in a wide NaF film thickness range of 0 to 2nm. The minimum value of $J_{DI}/J_{SS}$,for $Alq_{3}:Cs_{2}CO_{3}$ doped film is 1.24, which means that the theoretical ohmic contact between the organic layer and cathode is formed. These characterization results are consisted with the observations in steady-state $current-voltage(_{J-V}$) experiments. The great electron injection enhancements in the devices pave the way for an application of the cathodic injection in the preparation of OLEDs are confirmed by doping $Alq_{3}$ with $Cs_{2}CO_{3}$. |
| Related Links | https://iopscience.iop.org/article/10.1088/1361-6463/ab20c0/pdf |
| ISSN | 00223727 |
| e-ISSN | 13616463 |
| DOI | 10.1088/1361-6463/ab20c0 |
| Journal | Journal of Physics D: Applied Physics |
| Issue Number | 34 |
| Volume Number | 52 |
| Language | English |
| Publisher | IOP Publishing |
| Publisher Date | 2019-05-09 |
| Access Restriction | Open |
| Subject Keyword | Journal: Journal of Physics D: Applied Physics Applied Physics Electron Injection Ohmic Contact |
| Content Type | Text |
| Resource Type | Article |
| Subject | Surfaces, Coatings and Films Acoustics and Ultrasonics Condensed Matter Physics Electronic, Optical and Magnetic Materials |
