Russian scientists have proposed a way to speed up phosphor production for white LEDs by 10-20 times. This was reported by the press service of the RNF.
In the modern world, they are trying to stop using incandescent and halogen lamps and switch to devices with diodes instead. At the same time, it is not the energy efficiency of the lamps that is important for cars, ships and airplanes, but their brightness. Ultra-bright and durable white LEDs are made of ceramic phosphors, but a significant drawback of their manufacture is the need for long-term sintering at high temperatures.
Specialists of the Far Eastern Federal University have created a new ceramic phosphor using an innovative material sintering method. It consists of yttrium aluminum garnet (YAG) with the addition of cerium (Ce) and aluminum oxide (Al2O3) as a heat-resistant component. As a result, the thermal conductivity of the ceramic material of this composition was 15 times higher than that of the original powders. In addition, Al2O3 particles changed the light emission in the phosphor, ensuring the uniformity of the color of the LEDs and the high luminescence efficiency reaching 80.7%.
At the same time, the scientists proposed a new approach – reactive spark plasma sintering, in which spark discharges and phase transformations between sintered particles enable active compression of the material. This approach reduced the sintering temperature of the material by 20% compared to the conventional vacuum sintering method and reduced the total processing time by 10-20 times.
As a result, the resulting phosphor has high luminosity, is reliable and easy to manufacture because it is made in one step.
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