news digest ♦ LEDs


IP. Most of the major LED players are present in the list of the top patent assignees. But independent phosphor manufacturers like Intematix or Mitsubishi that are offering their phosphors on the open market are also emerging as major forces in the IP landscape.


Leading Taiwan based packagers are notably absent from Yole’s ranking. This weak position explains the large number of litigations and one way, royalty or supply based license agreements involving those companies.


Based on this portfolio analysis as well as on their litigation and licensing history, Yole identified 15 major players that are profiled in this report.


QMC sends CdSe samples to Asian LCD display manufacturer


The cadmium selenide samples will be used to enhance the performance and energy efficiency of high-resolution computer, TV and smartphone displays


Composition focus shifting from yellow to red and green phosphors


With high performing silicates now widely available as a YAG substitutes for yellow emission, the focus on new composition development and patent protection has shifted toward red and green converters.


The market for those new phosphors and some of the most critical IP are currently dominated by Mitsubishi and Denka, which have acquired nitrides and oxynitrides licenses from NIMS.


However, many other players are also developing nitride and oxynitride compositions, including Intematix, Beijing Yuji and Lightscape (now dow electronic materials). New material families are also considered as promising phosphors including Tungstate and Molybdates as well as Fluorides championed by GE.


Following recent progress in thermal stability and manufacturability, quantum dot are also finally emerging as a credible option. Because of their narrow emission bands, LCD display is the most promising application for the technology. In lighting, the use of red QD in combination with standard phosphor could emerge in remote phosphor applications.


Quantum Materials says it has shipped CdSe Tetrapod Quantum Dots in sample quantities to a leading Asian- based electronics manufacturer.


Quantum Materials Corporation (QMC) recently developed tetrapod quantum dots to meet the client’s performance specifications.


QMC’s CdSe Tetrapod Quantum Dots. Left: Luminescent Vials show colour varies with QD size. Right: Tetrapod Quantum Dots by Electron Microscope


Tetrapod Quantum Dots are an advanced nanoscale material that improves the performance and energy efficiency of very high-resolution computer, TV and smartphone displays.


Quantum Materials’ patent-pending continuous-flow technology produces uniform, narrow bandwidth tetrapod quantum dots with bright emission, less aggregation, purer colours (including high-luminous red) and precise colour rendition.


76 www.compoundsemiconductor.net October 2013


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