abstract |
We describe a luminescent device ( 120, 130 ) comprising a substrate ( 102 ) and a film comprising perovskite crystals ( 122, 132 ) deposited on the substrate, wherein the film comprising perovskite crystals is encapsulated with a layer ( 124, 134 )) or within a matrix ( 124, 134 ) of an insulating oxide or an insulating nitride. |