In recent years, the application of emerging metal halide perovskite materials in light emitting devices has attracted widespread attention. However, the poor working stability of this type of device has become a bottleneck in its application.
Researchers based on low-cost, full-solution processes that have the potential to be used for large-scale production have successfully produced highly efficient and stable perovskite quantum dot LEDs. The device exhibits high-brightness green light emission with an external quantum efficiency of 3.79%. The brightness is 6093.2 cd/m2. Its comprehensive performance is comparable to that of the perovskite LEDs prepared by common vacuum deposition methods, while maintaining the unique advantages of the solution method.
What's more, the device exhibits excellent humidity and temperature stability. The device can work continuously for more than 12 hours in a high-humidity environment with a relative humidity of 75%, and it still has strong light at a high temperature of 120 degrees Celsius. Output, and after 3 consecutive heating cycles, after the cooling cycle test, the device's luminous performance can be restored to 85%.