Printable and Writable CsPbBr₃/Cs₄PbBr₆ Perovskite Quantum Dots as Fluorescent Inks for Down-Conversion Flexible ACEL Devices

Abstract

Inorganic perovskites show excellent advantages over traditional quantum dots (QDs) and have great potential for application in light-emitting devices, display devices, and other fields. In this paper, CsPbBr3/Cs4PbBr6 QDs with different cesium-to-lead ratios are synthesized in one step at room temperature and in a simple environment without protective measures. Among them, the perovskite powder with a photoluminescence quantum yield (PLQY) of 54% and a series of ink additives are formulated into a perovskite fluorescent ink with high stability and printability. The inks are used not only for printing but also for writing with simple and convenient application conditions in mass production. Finally, the inks are used to combine ZnS:Cu flexible alternative current electroluminescent (ACEL) devices to produce two different structures of light conversion flexible ACEL devices in a full-printing manner. The material loss and cost of the devices are very low. Pattern drawing and printing can be performed selectively. Among them, the P-outside structure ACEL device has a high lumen efficiency of 77.43 lm/W, which shows the application potential of the ink in ACEL devices and promotes the process of perovskite materials from laboratory to industrial applications.

CsPbBr3/Cs4PbBr6 Quantum Dots in Rigid Lithium Disilicate Glass Ceramics for Lighting and Displays

“…With the increase of calcination time, the emission intensity first increases and reaches the maximum when the calcination time is 180 min. A slight blue shift from 520 to 517 nm can be observed along with the increasing calcination time (from 30 to 180 min), probably attributed to the phase transition between CsPbBr 3 and Cs 4 PbBr 6 crystals Figure S6 displays actual pictures of samples with a mass ratio of 30% calcined at 600 °C for different times under natural light and 365 nm UV lamps.…”

“…A slight blue shift from 520 to 517 nm can be observed along with the increasing calcination time (from 30 to 180 min), probably attributed to the phase transition between CsPbBr 3 and Cs 4 PbBr 6 crystals. 22 Figure S6 displays actual pictures of samples with a mass ratio of 30% calcined at 600 °C for different times under natural light and 365 nm UV lamps. It is proven that 180 min is the optimal experimental temperature.…”

Interfacing Lanthanide Metal‐Organic Frameworks with ZnO Nanowires for Alternating Current Electroluminescence

“…Although several other materials, such as quantum dots (QDs) and inorganic oxides, have been discovered to show ACEL, they generally require delicate device fabrication and display limited color tunability. [15][16][17][18] Therefore, it is in high demand to develop novel ACEL materials with high emission performance.…”