A high performance red phosphor that illuminates the future
2019-05-02

As the global population grows and industrialization grows, so does the demand for energy. According to the 2017 World Energy Outlook released by the International Energy Agency, global energy consumption is expected to increase by 28% between 2015 and 2040, equivalent to 4,72 × 1010 MWh. A series of challenges brought about by the increase in energy consumption, the most prominent of which is the world's climate impact and the reduction of fossil fuel reserves, the development of energy-saving technologies is imminent.


In 2015, the US lighting industry accounted for 15% of national electricity consumption. The US Energy Division estimates that solid-state lighting technology (SSL) can bring up to 75% potential energy savings compared to non-solid-state lighting in 2035. The commercial breakthrough of SSL comes from the invention of phosphor-converted white LED, which mainly uses a part of blue light emitted by a blue LED chip to be converted into longer-wavelength light by a mixed luminescent material to obtain white light (additive color mixing). ).


Light-emitting diode technology can greatly reduce energy consumption. For white light-emitting diodes with phosphor conversion, since blue LEDs have been highly optimized, finding new conversion phosphors is essential for improving white light-emitting diodes. German researchers have found that the high-performance red phosphor Sr[li2Al2O2N2]:Eu2+ meets all the requirements for the optical properties required of phosphors. It has excellent thermal stability and a very narrow full width at half-hyperspectometry. The luminous efficiency is improved by 16% compared to the white LEDs that are currently converted by the high color rendering phosphors sold on the market. At the same time, it maintains excellent color rendering ability, which makes the conversion efficiency of white LEDs greatly improved. This research paper was published in the academic journal 'NPG Asia Materials' of the Nature Publishing Group.


Source: OFweek Display Network