A chemical reaction triggered by zinc can produce a light signal 195 times brighter than standard sensors.

Testing for minerals in complex environments like farm soil is usually slow and requires expensive lab equipment. This new sensor uses zinc ions to force molecules into a rigid cluster that glows with intense fluorescence. The signal is so bright and clear that a standard smartphone camera can read the results accurately. It works even in the messy chemical background of real-world soil samples. This allows farmers to test their land for vital nutrients instantly without sending samples away for analysis.