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Universal Display Corp. Message Board

  • pholedphan pholedphan Mar 24, 2006 3:29 PM Flag

    2 new patents

    United States Patent # 7011897
    Thompson , et al.
    March 14, 2006

    Organic light emitting materials and devices

    United States Patent # 7012363
    Weaver , et al .
    March 14, 2006
    OLEDs having increased external electroluminescence quantum efficiencies

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    • In the recent webcasts, Sid explained that the rapid progress on the phosphorescent blue materials was due to some breakthroughs in their understanding of the processes at a molecular level. There is a section in the new patent that explains how certain parts of the molecule, using FirPic as an example, affect stability and the color emitted and how they can substitute other atoms or molecular groupings into these locations on the molecule to tune both the lifetime and color emissions.

      I don't have a clue how much protection from competitors this patent offers, but to me, it offers a hint that the recent progress on blue was not a fluke and that their understanding of the molecular processes is reaching a point where they can apply systematic methodologies for improving their materials and we can expect to see the rate of improvements to continue at a rapid pace.

      • 1 Reply to daryl_mussell
      • Daryl, Steve, et al.,

        The patents were submitted in 2002 and 2003, and they therefore represent milestones in UDC's approach to OLED design. Because they were submitted a couple of years ago, current PHOLEDs no doubt use additional developments. On the other hand, each patent reestablishes UDC's ownership of phosphorescent OLEDs, making it harder for companies to design around UDC and extending UDC's ownership beyond the basic PHOLED patent. Like Daryl, I don't know which patents will prove to be most important in reestablishing UDC's ownership of PHOLEDs - and I'll bet you that even the scientists themselves aren't completely sure about that - but the body of patents is reassuringly extensive.

        I'm not counting on a rapid development on blue. It may be achievable based on current knowledge or they may need another breakthrough. Dean's pleasant bromides about a direct path are, after hearing them for several years, not quite as reassuring.

        The Samsung SDI intentions are terrific, and you have to love the Corning guy's comments about how great sample AMOLED panels look. An advantage of LITI is that the donor sheets can be made by VTE, OVPD, spin casting, whatever. The donor sheets can therefore use PIN doping of transport layers, phosphorescent emission, and whatever else SDI may want to include to optimize the AMOLED. SDI's AMOLEDs are therefore likely to be a cut above the competittion.

    • The first of the two patents refers to a BLUE emitting OLED. Could they be making progress?

      "49. The light emitting device of claim 39, wherein light emitted by the organic layer has a maximum wavelength of less than 520 nm.

      50. The light emitting device of claim 39 wherein light emitted by the organic layer has a wavelength of between approximately 420 nm and approximately 480 nm."

      Light waves between 420 and 480 nm are BLUE!

      • 2 Replies to s2dent4lif
      • After a quick scan. They spend a lot of time talking about blue PHOLEDs
        Found this interesting:
        In one embodiment of the invention, a stable phosphorescent material that emits a saturated blue is sought. In other embodiments, other colors are sought. For example, a saturated green or a saturated red may be obtained. While green and red phosphorescent materials are generally more available in the prior art than blue, embodiments of the present invention may lead to phosphorescent materials having better color saturation, better stability, or both.

        Hopefully ZZ or OR will decipher these new patents for us??

      • Obviously, the edges of the visible spectrum are becoming increasingly important, namely UV and IR.


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