Japanese researchers said they have developed a new material for organic light-emitting diodes (OLEDs) that is free of rare metals and can slash the costs to produce smartphone displays and other appliances.
The team led by Chihaya Adachi, director of Kyushu University's Center for Organic Photonics and Electronics Research, said they created a dicyanobenzene derivative, an organic chemical compound that emits light at high efficiencies, without the use of rare metals.
The material is as cheap as fluorescent substances and is as efficient in electroluminescence, or the use of electrons to induce light emission, as phosphorous substances, they said.
The team named the new material's light-emitting features "hyperfluorescence."
"We wish to tie up with Japanese manufacturers and strive to commercialize our Japan-born technology at an early date," Adachi said.
Existing OLEDs use fluorescent and phosphorescent materials. Fluorescent substances are cheap but they have low efficiencies of electroluminescence. Phosphorescent substances have electroluminescence efficiencies of almost 100-percent, but they require the use of iridium or other expensive rare metals.
Without the use of rare metals, the costs for materials in OLEDs can be reduced to about one-10th, the scientists said.
High-resolution OLED panels are flat and consume low power. They are expected to be widely used in next-generation models of flat-panel TVs and lighting equipment.
The team’s research results were published in the Dec. 13 edition of Nature, a British scientific journal.