Composition for encapsulant and encapsulant and electronic device

Patent metadata

Field	Value
Publication number	US-9905738-B2
Application number	US-201514643620-A
Country	US
Kind code	B2
Filing date	Mar 10, 2015
Priority date	Mar 11, 2014
Publication date	Feb 27, 2018
Grant date	Feb 27, 2018

Abstract

Provided are a composition for an encapsulant having a viscosity of about 4,000 to about 9,500 mPa·s when measured using a Brookfield (DV-II+pro) spindle No. 52 at a torque of about 90% under atmospheric pressure at about 23° C., whereby maintaining a phosphor precipitation degree within about 18% when including a phosphor and allowed to stand at about 23° C. for greater than or equal to about 2 hours, and including at least one first siloxane compound having a silicon-bonded hydrogen (Si—H) and at least one second siloxane compound having a silicon-bonded alkenyl group (Si-Vi), an encapsulant obtained by curing the composition, and an electronic device including the encapsulant.

First claim

What is claimed is:

1. A phosphor-containing mixture, comprising:
a composition comprising:
a first siloxane compound having a silicon-bonded hydrogen, and a second siloxane compound having a silicon-bonded alkenyl group,
wherein: the first siloxane compound is included in an amount of less than about 50wt % based on the total amount of the first siloxane compound and the second siloxane compound, and the second siloxane compound is included in an amount of greater than about 50wt % based on the total amount of the first siloxane compound and the second siloxane compound, and a siloxane mixture consisting of the first siloxane compound, the second siloxane compound, and a hydrosilylation catalyst has a viscosity of about 4,000 to about 10,000 mPa·s when measured using a Brookfield (DV-II+pro) spindle No. 52 at a torque of about 90% under atmospheric pressure at about 23° C.; and a phosphor having a density of about 3.5 g/cm 3 to about 6.5 g/cm 3 , the phosphor being present in an amount of about 5% to about 40% based on the weight of the composition,
wherein the siloxane mixture, when combined with the phosphor and allowed to stand at about 23° C. for greater than or equal to about 2 hours, exhibits a phosphor precipitation degree of about 18% or less.

2. The phosphor-containing mixture according to claim 1 , wherein the phosphor precipitation degree is determined by:
measuring a light back scattering spectrum of the siloxane mixture of the composition and the phosphor, the light back scattering spectrum being evaluated in a vertical direction over time using a Turbiscan equipment,
comparing each measurement value with an initial spectrum, and
evaluating the changed degree.

3. The phosphor-containing mixture according to claim 1 , wherein the composition has a transmittance, after curing the composition, of greater than or equal to about 90% at a wavelength of about 450 nm.

4. The phosphor-containing mixture according to claim 1 , wherein the composition has a refractive index, before curing the composition, of greater than or equal to about 1.40 at 589 nm.

5. The phosphor-containing mixture according to claim 1 , wherein the first siloxane compound is represented by Chemical Formula 1:
(R 7 R 8 R 9 SiO 1/2 ) M2 (R 10 R 11 SiO 2/2 ) D3 (R 12 SiO 3/2 ) T2 (SiO 3/2 —Y 1 —SiO 3/2 ) T3 (SiO 4/2 ) Q2   [Chemical Formula 1]

wherein, in Chemical Formula 1,
R 7 to R 12 are independently hydrogen, a substituted or unsubstituted C1 to C30 alkyl group, a substituted or unsubstituted C3 to C30 cycloalkyl group, a substituted or unsubstituted C6 to C30 aryl group, a substituted or unsubstituted C7 to C30 arylalkyl group, a substituted or unsubstituted C1 to C30 heteroalkyl group, a substituted or unsubstituted C2 to C30 heterocycloalkyl group, a substituted or unsubstituted C2 to C30 alkynyl group, a substituted or unsubstituted C1 to C30 alkoxy group, a substituted or unsubstituted C1 to C30 carbonyl group, a hydroxy group, or a combination thereof,
at least one of R 7 to R 12 includes hydrogen,
Y 1 is a single bond, a substituted or unsubstituted C1 to C20 alkylene group, a substituted or unsubstituted C3 to C20 cycloalkylene group, a substituted or unsubstituted C6 to C20 arylene group, a substituted or unsubstituted C2 to C20 heteroarylene group, a substituted or unsubstituted C2 to C20 alkenylene group, a substituted or unsubstituted C2 to C20 alkynylene group, or a combination thereof,
0<M2<1, 0≦D3<1, 0≦T2<1, 0≦T3<1, 0≦Q2<1, and
M2+D3+T2+T3+Q2=1.

6. The phosphor-containing mixture according to claim 5 , wherein at least one of the R 7 to R 12 includes a substituted or unsubstituted C6 to C30 aryl group.

7. The phosphor-containing mixture according to claim 1 , wherein the second siloxane compound is represented by Chemical Formula 2:
(R 13 R 14 R 15 SiO 1/2 ) M3 (R 16 R 17 SiO 2/2 ) D4 (R 18 SiO 3/2 ) T4 (SiO 3/2 —Y 2 —SiO 3/2 ) T5 (SiO 4/2 ) Q3   [Chemical Formula 2]

wherein, in Chemical Formula 2,
R 13 to R 18 are independently a substituted or unsubstituted C1 to C30 alkyl group, a substituted or unsubstituted C3 to C30 cycloalkyl group, a substituted or unsubstituted C6 to C30 aryl group, a substituted or unsubstituted C7 to C30 arylalkyl group, a substituted or unsubstituted C1 to C30 heteroalkyl group, a substituted or unsubstituted C2 to C30 heterocycloalkyl group, a substituted or unsubstituted C2 to C30 alkenyl group, a substituted or unsubstituted C2 to C30 alkynyl group, a substituted or unsubstituted C1 to C30 alkoxy group, a substituted or unsubstituted C1 to C30 carbonyl group, a hydroxy group, or a combination thereof,
at least one of R 13 to R 18 includes a substituted or unsubstituted C2 to C30 alkenyl group,
Y 2 is a single bond, a substituted or unsubstituted C1 to C20 alkylene group, a substituted or unsubstituted C3 to C20 cycloalkylene group, a substituted or unsubstituted C6 to C20 arylene group, a substituted or unsubstituted C2 to C20 heteroarylene group, a substituted or unsubstituted C2 to C20 alkenylene group, a substituted or unsubstituted C2 to C20 alkynylene group, or a combination thereof,
0<M3<1, 0≦D4<1, 0≦T4<1, 0≦T5<1, 0≦Q3<1, and
M3+D4+T4+T5+Q3=1.

8. The phosphor-containing mixture according to claim 7 , wherein at least one of the R 13 to R 18 includes a substituted or unsubstituted C6 to C30 aryl group.

9. The phosphor-containing mixture according to claim 1 , wherein the siloxane mixture has a viscosity of about 4,000 to about 9,500 mPa·s when measured using a Brookfield (DV-II+pro) spindle No. 52 at a torque of about 90% under atmospheric pressure at about 23° C.

10. An encapsulant obtained by curing the phosphor-containing mixture according to claim 1 .

11. An electronic device comprising the encapsulant as according to claim 10 .

Assignees

• Samsung Sdi Co Ltd

Inventors

• Yoo Hong Jung
• Kim Young Ho
• Kim Woo Han
• Song Doo Ri
• Lee Eun Seon

Classifications

• C08G77/20

  containing silicon bound to unsaturated aliphatic groups · CPC title

• H01L33/501

  Electricity · mapped topic

• C08K5/56

  Organo-metallic compounds, i.e. organic compounds containing a metal-to-carbon bond · CPC title

• C08G77/80

  Siloxanes having aromatic substituents, e.g. phenyl side groups · CPC title

• C08L83/04

  Polysiloxanes · CPC title