US2022179191A1PendingUtilityA1

High temperature resistant reflective layer for wavelength conversion devices

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Assignee: MATERION PREC OPTICS SHANGHAI LIMITEDPriority: Apr 19, 2019Filed: Apr 16, 2020Published: Jun 9, 2022
Est. expiryApr 19, 2039(~12.7 yrs left)· nominal 20-yr term from priority
Inventors:Wen ZhangAnsheng Liang
F21V 7/26F21V 7/30G02B 5/0808G02B 26/008G03B 21/2066G03B 21/204G03B 21/16G02B 26/007F21V 9/45
46
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Claims

Abstract

A wavelength conversion device (100), such as a phosphor wheel, comprises: a substrate (110), a reflective layer (120) and a wavelength conversion layer(130) on the reflective layer (120). The reflective layer (120) comprises (A) an inorganic binder or an organic silicone, and (B) reflective nanoparticles (122). The nanoparticles (122) have a particle size of about 200 nanometers to about 500 nanometers. The reflective layer (120) has high thermal stability. A method of manufacturing the wavelength conversion device (100) and a light projection system comprising the wavelength conversion device (100) are also disclosed.

Claims

exact text as granted — not AI-modified
1 . A wavelength conversion device, comprising:
 a substrate;   a reflective layer on the substrate, the reflective layer comprising (A) a binder; and (B) reflective titanium dioxide (TiO 2 ) nanoparticles having a particle size of   about 200 nanometers to about 500 nanometers; and   a wavelength conversion layer on the reflective layer;   wherein the reflective layer is thermally stable at 250° C.   
     
     
         2 . The wavelength conversion device of  claim 1 , wherein the reflective TiO 2  nanoparticles are surface modified with an organic alcohol, a siloxane, aluminum oxide (Al 2 O 3 ), zirconium dioxide (ZrO 2 ), or silicon dioxide (SiO 2 ). 
     
     
         3 . The wavelength conversion device of  claim 1 , wherein the reflective layer has a thickness of about 0.05 mm to about 0.15 mm. 
     
     
         4 . The wavelength conversion device of  claim 1 , wherein a weight ratio of the (B) reflective nanoparticles to the (A) binder is from about 1:2.5 to about 1:0.8. 
     
     
         5 . The wavelength conversion device of  claim 1 , wherein a weight ratio of the (B) reflective nanoparticles to the (A) binder is from about 1:10 to about 1:0.2. 
     
     
         6 . The wavelength conversion device of  claim 1 , wherein the binder (A) comprises a mixture of a solvent and an inorganic binder material, wherein a weight ratio of solvent to inorganic binder material is from about 10:1 to about 0:1. 
     
     
         7 . The wavelength conversion device of  claim 6 , wherein a weight ratio of the (B) reflective nanoparticles to the (A) binder is from about 1:10 to about 1:0.2. 
     
     
         8 . The wavelength conversion device of  claim 1 , wherein the binder (A) comprises an inorganic sol-gel made from silicon dioxide or aluminum oxide. 
     
     
         9 . The wavelength conversion device of  claim 1 , wherein the binder (A) comprises octamethyltrisiloxane. 
     
     
         10 . The wavelength conversion device of  claim 1 , wherein the reflective layer has at least 95% reflectivity for light having a wavelength from about 420 nm to about 680 nm. 
     
     
         11 . The wavelength conversion device of  claim 1 , wherein the phosphor layer comprises phosphor particles dispersed in glass, or in a crystal, or in a ceramic material. 
     
     
         12 . The wavelength conversion device of  claim 1 , further comprising at least one of: a motor for rotating the substrate; or the substrate has a disk shape. 
     
     
         13 . (canceled) 
     
     
         14 . The wavelength conversion device of  claim 1 , wherein the substrate is a metal, a non-metallic material, or a composite material. 
     
     
         15 . A light projection system comprising the wavelength conversion device of  claim 1 . 
     
     
         16 . A method of making a wavelength conversion device, comprising:
 applying a composition to a substrate to form a reflective layer on the substrate, the composition comprising (A) a binder; and (B) reflective titanium dioxide (TiO 2 ) nanoparticles having a particle size of about 200 nanometers to about 500 nanometers; and   forming a wavelength conversion layer on the reflective layer;   wherein the reflective layer is thermally stable at 250° C.   
     
     
         17 . The method of  claim 16 , wherein the composition has a viscosity of about 0 centipoise (cP) to about 1500 cP. 
     
     
         18 . The method of  claim 16 , further comprising one of:
 curing the composition at a temperature of about 85° C. to about 150° C.; or applying the composition by dispensing, spraying, brushing, flowing, coating, or silk printing.   
     
     
         19 . The method of  claim 16 , wherein a weight ratio of the (B) reflective nanoparticles to the (A) binder is from about 1:10 to about 1:0.2. 
     
     
         20 . The method of  claim 16 , further comprising one of:
 wherein the binder (A) comprises a mixture of a solvent and an inorganic binder material, wherein a weight ratio of solvent to inorganic binder material is from about 10:1 to about 0:1 or wherein a weight ratio of the (B) reflective nanoparticles to the (A) binder is from about 1:10 to about 1:0.2.   
     
     
         21 . (canceled) 
     
     
         22 . The method of  claim 16 , wherein the binder (A) comprises an inorganic sol-gel made from silicon dioxide or aluminum oxide. 
     
     
         23 . (canceled) 
     
     
         24 . (canceled) 
     
     
         25 . (canceled)

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