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The present invention relates to method for producing LED by one step film lamination. The method comprises: laminating two or more LEDs with two or more colored phosphor films by one step film lamination; wherein each of the colored phosphor film comprises each other different colored phosphor composition which has a Maximum tan δ; and the difference of each Maximum tan δ varies within a range of 0-30%. In the present invention, the method for producing a LED may greatly improve production efficiency (i.e., dual and multi-color LEDs in one step) and lower cost of ownership. Further, it may improve uniformity of phosphor dispersion, thereby improve color quality of LEDs.

Titel:	Method for producing LED by one step film lamination
Autor/in / Beteiligte Person:	Rohm and Haas Electronic Materials, LLC ; DDP Specialty Electronic Materials US 9, LLC
Link:	View record in USPTO Patent Grants (Volltext)
Veröffentlichung:	2024
Medientyp:	Patent
Sonstiges:	Nachgewiesen in: USPTO Patent Grants Sprachen: English Patent Number: 11923,483 Publication Date: March 05, 2024 Appl. No: 17/055340 Application Filed: May 18, 2018 Assignees: DDP SPECIALTY ELECTRONIC MATERIALS US, LLC (Wilmington, DE, US), ROHM AND HAAS ELECTRONC MATERIALS LLC (Wilmington, DE, US) Claim: 1. A method for producing LEDs having two or more colors, comprising: curing two or more separate colored phosphor films laminated to each other and to each of two or more LEDs by one heating step; wherein each of the colored phosphor film comprises each other different colored phosphor composition which has a Maximum tan δ; and the difference of each Maximum tan δ varies within a range of 0-30% and wherein the colored phosphor composition comprises a silicone binder. Claim: 2. The method according to claim 1 , wherein each of the different colored phosphor composition has a gelling time, and the difference of each gelling time varies within a range of 0-50%. Claim: 3. The method according to claim 1 , wherein the difference of each Maximum tan δ varies within a range of 0-15%. Claim: 4. The method according to claim 1 , wherein the colored phosphor composition further comprises a cure catalyst and a phosphor; and the difference of Maximum tan δ is controlled by adjusting a ratio of the catalyst and silicone binder, and/or a ratio of the silicone binder and phosphor. Claim: 5. The method according to claim 2 , wherein the colored phosphor composition further comprises a cure catalyst and a phosphor; and the difference of gelling time and/or Maximum tan δ is controlled by adjusting a ratio of the catalyst and silicone binder, and/or a ratio of the silicone binder and phosphor. Claim: 6. The method according to claim 4 , wherein the phosphor is pre-treated with a treatment agent. Claim: 7. The method according to claim 6 , wherein the treatment agent is a basic compound. Claim: 8. The method according to claim 6 , wherein the phosphor is pre-treated by the following method: (1) contacting the phosphor with treatment agent for a period time so as to ensure a good dispersion of phosphor in the treatment agent; and (2) drying the phosphor coated with the treatment agent, which is ready to be used with the silicone binder. Patent References Cited: 7943947 May 2011 Do ; 20100129589 May 2010 Senibi ; 20110002140 January 2011 Tsukahara et al. ; 20130168717 July 2013 Kono ; 20130221835 August 2013 Basin et al. ; 20150329770 November 2015 Kaneyoshi et al. ; 20160230084 August 2016 Liu et al. ; 20180053881 February 2018 Murphy ; 20180057714 March 2018 Teng et al. ; 20190055361 February 2019 Roitman ; 104357909 February 2015 ; 106486505 March 2017 ; 2014-116587 June 2014 ; 2015-046607 March 2015 ; 2015-130459 July 2015 ; 10-2014-0024932 March 2014 ; 2015/060289 April 2015 Other References: European Search Report for corresponding European Patent Application No. EP18918870 dated Dec. 3, 2021. cited by applicant ; English translation of Notice of Preliminary Rejection for corresponding Korean Application No. 10-2020-7032854 dated Jan. 21, 2022. cited by applicant ; Search report for corresponding International Application No. PCT/CN2018087460 dated Jan. 30, 2019. cited by applicant ; English translation of Decision of Dismissal of Amendment for corresponding Japanese Patent Application No. 2020-563919 dated Apr. 10, 2023. cited by applicant ; English translation of Notice on the First Office Action for corresponding Chinese Patent Application No. 201880093367.9 dated Sep. 22, 2023. cited by applicant Primary Examiner: Salerno, Sarah K

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Method for producing LED by one step film lamination