Red Light-Emitting Diodes with All-Inorganic CsPbI3/TOPO Composite Nanowires Color Conversion Films

Abstract

This work presents a method for obtaining a color-converted red light source through a combination of a blue GaN light-emitting diode and a red fluorescent color conversion film of a perovskite CsPbI3/TOPO composite. High-quality CsPbI3 quantum dots (QDs) were prepared using the hot-injection method. The colloidal QD solutions were mixed with different ratios of trioctylphosphine oxide (TOPO) to form nanowires. The color conversion films prepared by the mixed ultraviolet resin and colloidal solutions were coated on blue LEDs. The optical and electrical properties of the devices were measured and analyzed at an injection current of 50 mA; it was observed that the strongest red light intensity was 93.1 cd/m2 and the external quantum efficiency was 5.7% at a wavelength of approximately 708 nm when CsPbI3/TOPO was 1:0.35.

Influence of surface passivation on perovskite CsPbBr1.2I1.8 quantum dots and application of high purity red light-emitting diodes

“…It may be contributed to the self-aggregation effect of TOPO, as shown in Fig. 5(c) and (d) [22,23]. Although the coverage and compact are improved by using TOPO, the height difference on the surface of CsPbBr 1.2 I 1.8 :TOPO lm is great owing to the reaction rate.…”

“…1.2 I 1.8 QDs mixed with various concentration of TOPO. Obviously, the size distribution of QD particles appeared barely change, but condensation and compact as the concentration of TOPO added into the solution of CsPbBr 1.2 I 1.8 QDs increases due to self-aggregation effect[22,23].Figure 4(a) plots the photoluminescence (PL) spectra of CsPbBr 1.2 I 1.8 QDs mixed with various concentration of TOPO. The PL peak position of all samples is around 652 nm.…”

Influence of Surface Passivation on Perovskite CsPbBr1.2I1.8 Quantum Dots and Application of High Purity Red Light-Emitting Diodes

“…Figure 3 shows TEM images of CsPbBr 1.2 I 1.8 QDs mixed with various concentration of TOPO. Obviously, the size distribution of QD particles appeared barely change, but condensation and compact as the concentration of TOPO added into the solution of CsPbBr 1.2 I 1.8 QDs increases due to self-aggregation effect [22,23]. As shown in Fig.…”

Microwave-facilitated crystal growth of defect-passivated triple-cation metal halide perovskites toward efficient solar cells

“…Therefore, TOPO has been an appealing defect passivator for enhancing the device performance in photovoltaics and light-emitting diodes based on metal halide perovskites, regardless of the dimensions. 26–29…”