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.