Dual function molecular additive, power 3D perovskite low attenuation high stable electroluminescence

The three-dimensional calcium-titanite has been proven to be an effective strategy for achieving high brightness efficient light emitting diode (LED). However, most of the three-dimensional calcium-titanium mine-emitting diodes still have serious efficiency attenuation.

Here, the author uses FAPBI3 as the model system, and the main cause of 3D perovskite-type LED-type LED efficiency and degradation is the ion migration of defects and electrical stress. By introducing a dual-function molecule 3-chlorobenzymamine additive in a perovskite precursor solution, the deleterious effect can be significantly inhibited by the growth and defect passivation of high jaws. This method produces a bright near-infraredcium-type LED having a peak external quantum efficiency of 16.6%, maintaining 80% of its peak at a high current density of 460 mA cm? 2, corresponding to 300 W SR? 1 m 2 The high brightness. In addition, at a constant current density of 100 mA-cm? 2,The device displays a half-life record of 49 h. Related papers are published in the nano letters journal in the nano letters journal in the nano letters journal in the Nano Letters Journal.

Paper link:

Https://pubs.acs.org/doi/10.1021/acs.nanolatt.0c04900?Ref=pdf

Metal halide calcium-type light-emitting diode (LED) is widely concerned in lighting and display field due to its processability, flexibility, high brightness, good color purity and potential low cost. The diversity of perovskite provides huge opportunities for improving device performance. For example, three dimensional (3D), quasi-quantum dotted titanium ore increased the external quantum efficiency (EQE) of the LED to 20%. However, although huge progress has been made in terms of device performance, the stability of devices is the main obstacle to the practical application of calcium titanium mine type LED. It is generally believed that ion migration of the perovskite layer is one of the main challenges of stabilizing calcium titanium-producing diodes. By adding large organic cation, quadriterous calcium-titanium-titanite having multiple quartz wells can inhibit ion migration and improve the stability of the device under electric field. In principle, the Russian compound in 3D perovskite is not as serious as low-dimensional calcium-titanium, which can cause LEDs with high efficiency and high brightness. However, in many perovskite devices, effective energy transfer cannot be observed due to Joule heating.

In this work, it is considered that the effective launch of FAPBI3 perovskite LEDs is mainly due to defects and ion migration, which disrupts the stability of the device. We further show that the addition of double-functional molecular 3-chlorobenzylamine (3Cl-BA) in the precursor solution can significantly inhibit harmful effects. This method can make the peak EQE of the perovskite LED of 16.6%, the electroluminescence (EL) peak is 803 nm, and the half maximum width is 42 nm, and the current density J80 can be defined as EQE to drop 80% of the peak value. The current density increases to increase a quantitative stage and T50 (half-life) ratio of three orders of magnitude higher than that control the perovskite LED. (文: Love Xinhua Luo Xing)

Figure 1.3Cl-BA group FAPBI3 light emitting diode of photoelectric characteristics.

figure 2. The efficiency of the LED based on FAPBI3 is reduced.

Figure 3. Characterization of FAPBI3 film in Figure 3.3Cl-BA group.