| 摘要 |
<p>A thin film phosphor for an electroluminescent device, and the electroluminescent device. The phosphor comprises a compound of the formula Mgx Ca1-x Al2 S4:M, where the value of x is in the range 0 < x < 0.3 and M is a rare earth activator. Preferably, the value of x is in the range 0.05 < x < 0.20. A thin film phosphor for an electroluminescent device, the phosphor comprising magnesium calcium thioaluminate activated with a rare earth metal, the calcium thioaluminate containing an amount of magnesium to effect a lowering of the temperature of deposition of the phosphor on a substrate. A method for the preparation of the phosphor on a substrate, said method comprising the steps of: (i) depositing a mixtures of sulphides of magnesium, calcium, aluminum and rare earth metal on a substrate, and (ii) annealing the mixture of sulphides on the substrate so as to form the phosphor. The mixture of sulphides may be deposited on the substrate at a temperature of not greater than 200 °C. Preferably, prior to step (i), a photoresist pattern is deposited on said substrate e.g. using photolithography.</p> |
