Innovations based on the outstanding properties of metal halide perovskites.
This new family of materials is already pushing the photovoltaics industry towards power conversion efficiencies that were previously thought unachievable at industrial scale.
Instead of creating power, however, we are using the superb absorption and emission properties of perovskites for light emission, harnessing the same level of efficiency and tunability that makes these materials unique.
Fundamental IP
Helio Display Materials has exclusively licensed fundamental patents from Oxford and Cambridge universities covering both photoluminescent (colour conversion) and electroluminescent (LED) applications of perovskites with priority dates starting from 2012. We are now building on this portfolio with our own technological developments and materials innovations.
Helio currently has more than 60 patents (granted and pending) from 14 patent families.
Our fundamental IP position gives Helio a unique opportunity to support and promote the widest possible adoption of perovskites in displays working with our customers and partners.
Perovskite Light Emitters
Our technologies are based on the use of innovative new materials built around metal halide perovskites. These materials are outstanding semiconductors which can be synthesized from low-temperature solution processes using earth abundant precursor materials. We take advantage of their exceptional high light absorption coefficients and emission efficiencies, as well as their extraordinary colour tunability, for applications as light emitters.
Perovskites vs Quantum Dots
Recently, quantum dots have emerged as innovative phosphors for displays with ultrawide colour gamut (colour space).
While quantum dots achieve their outstanding colour properties through an accurate control of the size of the nanocrystals (within less than 1 nm), perovskites demonstrate similar performance without the need of quantum size effects and core-shell nanostructures (see our blog article "Colour by Chemistry" for more on this).
Perovskites also exhibit much higher optical density than InP-based quantum dots. This allows thinner colour conversion layers driving significant performance band cost benefits (see our blog articles Blocking the Blue and Perovskites: Performance with Manufacturing Simplicity for more on this).
Perovskite vs III/V Semiconductors
Metal halide perovskites share many properties with the direct band gap semiconductors used for high efficiency solar cells (e.g. GaAs) and LEDs (e.g. GaN). These include high absorption coefficients and good charge transport properties.
In addition, their optical properties can be tuned easily by changing the composition of the materials, which facilitates novel applications as colour converters or tailored light sources.