Figure 1

MC response vs field, $B$ in bipolar organic diodes based on: (a)–(c) three isotopes of DOO-PPV; (d)–(f) MEH-PPV, PFO ($\mathrm{MC}\times 3$), and rubrene RBRN; ($\mathrm{MC}\times 8$). Panels (a) and (d) show $\mathrm{MC}(B)$ for $|B|<50\mathrm{mT}$; whereas panels (b) and (e) show the normalized $\mathrm{MC}(B)$ measured with high-field resolution, for $|B|<3\mathrm{mT}$ (some MC responses are shifted vertically for clarity); ${\mathrm{MC}}_{\max }$ is the saturation MC value at large $B$. $\Delta B$ is the HWHM for the normal $\mathrm{MC}(B)$ response, as defined in (a); whereas ${\mathrm{MC}}_{\min }$ and $B_m$ are for the USMFE response, as defined in (b). Panels (c) and (f), respectively, summarize $B_m$ vs $\Delta B$ for the $\mathrm{MC}(B)$ responses in (a) and (b), and (d) and (e); the straight lines are guides for the eye. Panel (f) also summarizes the USMFE response of electron-only MEH-$e$ and hole-only MEH-$h$ unipolar devices based on MEH-PPV [$\mathrm{MC}(B)$ shown in Fig. 2].Reuse & Permissions

Figure 2

Normalized $\mathrm{MC}(B)$ response for (a) $|B|<30\mathrm{mT}$, and (b) $|B|<2\mathrm{mT}$ of hole- and electron-only unipolar diodes based on MEH-PPV, measured at room temperature and $V=3$ and 20 V, respectively. The $\mathrm{MC}(B)$ responses are shifted in (b) for clarity.Reuse & Permissions

Figure 3

Normalized $\mathrm{MC}(B)$ response of a bipolar diode based on D-DOO-PPV for $|B|<0.5\mathrm{mT}$ at (a) various bias voltages at $T=10\mathrm{K}$, and (b) various temperatures at $V=3.4\mathrm{V}$; ${\mathrm{MC}}_{\max }$ is defined in Fig. 1. The insets in (a) and (b), respectively, summarize ${\mathrm{MC}}_{\min }/{\mathrm{MC}}_{\max }$ at various voltages at 10 K, and various temperatures at 3.4 V.Reuse & Permissions

Figure 4

(a) Example of calculated energy levels vs $B$ for a spin pair with isotropic HFI; $a_1/g{\mu }_B=3a_2/g{\mu }_B=3\mathrm{mT}$, $J=0$. Note the multiple level crossing at $B=0$. (b) Calculated $\mathrm{MC}(B)$ response for a SP with axially symmetric HFI averaged over all magnetic field directions. The isotropic HFI is the same as in (a). The anisotropic HFI is $a_{zz}=0.15a_i$ for the respective SP constituent.Reuse & Permissions