Back to results
US 12,577,463 B2Granted
Multi-color tunable upconversion nanophosphor
AssigneeKorea Institute of Science and Technology
InventorsHo Seong Jang, Gumin Kang, Hyungduk Ko, Seung Yong Lee, Kwang Rok Mun
Life of this patent
Estimating the term…
Abstract
Provided are a core-multishell upconversion nanophosphor capable of being excited by 800±20 nm, 980±20 nm, and 1530±20 nm near-infrared (NIR) light to emit various colors including green, red, blue, and combinations thereof, and a transparent polymer composite including the upconversion nanophosphor. A crystalline shell may be formed between the red, green, and blue emission layers to enable emission of pure red, green, or blue light, and be further formed on an outermost surface to provide a color-tunable and high-brightness upconversion nanophosphor.
Claims16
A hexagonal core/multishell upconversion nanophosphor capable of being excited by 800±20 nm, 980±20 nm, and 1530±20 nm near-infrared (NIR) light to emit blue, green, red, and combinations thereof,
- wherein the nanophosphor has a core/multishell structure comprising:
- a core provided as a Tm3+-doped fluoride nanoparticle represented by Chemical Formula 1;
- a crystalline shell represented by Chemical Formula 2;
- a green-emitting shell having a Yb3+, Er3+-co-doped crystalline composition represented by Chemical Formula 3;
- an absorption shell having a Nd3+, Yb3+-co-doped crystalline composition represented by Chemical Formula 4;
- a crystalline shell represented by Chemical Formula 5;
- a blue-emitting shell having a Tm3+-doped crystalline composition represented by Chemical Formula 6;
- and
- an outermost shell provided as a crystalline shell represented by Chemical Formula 7;
- NaEr1-a-bLbF4:Tm3+a [Chemical Formula 1]
- (In Chemical Formula 1, a is a real number of 0≤a≤0.5, b is a real number of 0<b<1 and 0≤a+b<1 and is selected within a range satisfying a+b<1, and L is any one selected from the group consisting of yttrium (Y), lanthanum (La), cerium (Ce), praseodymium (Pr), neodymium (Nd), promethium (Pm), samarium (Sm), europium (Eu), terbium (Tb), dysprosium (Dy), holmium (Ho), ytterbium (Yb), lutetium (Lu), gadolinium (Gd), and combinations thereof)
- NaY1-cMcF4 [Chemical Formula 2]
- (In Chemical Formula 2, c is a real number of 0≤c≤1, Mis any one selected from the group consisting of rare-earth elements and combinations thereof, and the rare-earth elements for M comprise any one selected from the group consisting of La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, erbium (Er), thulium (Tm), Yb, and Lu)
- NaY1-d-e-fNfF4:Yb3+d,Er3+e [Chemical Formula 3]
- (In Chemical Formula 3, d is a real number of 0<d≤1, e is a real number of 0≤e≤1, d and e are selected within a range satisfying a condition of 0<d+e≤1, f is a real number of 0≤f<1 and is selected within a range satisfying a condition of 0<d+e+f≤1, N is any one selected from the group consisting of rare-earth elements and combinations thereof, and the rare-earth elements for N comprise any one selected from the group consisting of La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Tm, and Lu)
- NaLu1-g-h-iQiF4:Nd3+g,Yb3+h [Chemical Formula 4]
- (In Chemical Formula 4, g is a real number of 0<g≤1, h is a real number of 0≤h≤0.5 and is selected within a range satisfying a condition of 0<g+h≤1, i is a real number of 0<i<1 and is selected within a range satisfying a condition of 0<g+h+i≤1, Q is any one selected from the group consisting of rare-earth elements and combinations thereof, and the rare-earth elements for Q comprise any one selected from the group consisting of La, Ce, Pr, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, and Y)
- NaY1-jRjF4 [Chemical Formula 5]
- (In Chemical Formula 5, j is selected within a range satisfying a condition of a real number of 0≤j≤1, R is any one selected from the group consisting of rare-earth elements and combinations thereof, and the rare-earth elements for R comprise any one selected from the group consisting of La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, and Lu,
- NaYb1-k-lTlF4:Tm3+k [Chemical Formula 6]
- (In Chemical Formula 6, k is a real number of 0<k<1, 1 is a real number of 0≤l<1 and is selected within a range satisfying a condition of 0<k+l<1, T is any one selected from the group consisting of rare-earth elements and combinations thereof, and the rare-earth elements for T comprise any one selected from the group consisting of Y, La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, and Lu)
- NaY1-mZmF4 [Chemical Formula 7]
- (In Chemical Formula 7, m is selected within a range satisfying a condition of a real number of 0≤m≤1, Z is any one selected from the group consisting of rare-earth elements and combinations thereof, and the rare-earth elements for Z comprise any one selected from the group consisting of La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, and Lu).
20 more elements
A hexagonal core/multishell upconversion nanophosphor capable of being excited by 800±20 nm, 980±20 nm, and 1530±20 nm near-infrared (NIR) light to emit blue, green, red, and combinations thereof,
- wherein the nanophosphor has a core/multishell structure comprising:
- a core provided as a Tm3+-doped fluoride nanoparticle represented by Chemical Formula 8;
- a crystalline shell represented by Chemical Formula 9;
- a green-emitting shell having a Yb3+, Er3+-co-doped crystalline composition represented by Chemical Formula 10;
- an absorption shell having a Nd3+, Yb3+-co-doped crystalline composition represented by Chemical Formula 11;
- a crystalline shell represented by Chemical Formula 12;
- a red-emitting shell having a Tm3+-doped crystalline composition represented by Chemical Formula 13;
- and
- an outermost shell provided as a crystalline shell represented by Chemical Formula 14,
- NaGd1-k-l-mTmF4:Ybl,Tm3+k [Chemical Formula 8]
- (In Chemical Formula 8, k is a real number of 0<k<1, 1 is a real number of 0<l<1, m is a real number of 0≤m<1, 1 and m are selected within a range satisfying a condition of 0<k+1+m≤1, and T is any one selected from the group consisting of Y, La, Ce, Pr, Nd, Pm, Sm, Eu, Tb, Dy, Ho, Er, Lu, and combinations thereof)
- NaY1-cMcF4 [Chemical Formula 9]
- (In Chemical Formula 9, c is a real number of 0≤c≤1, Mis any one selected from the group consisting of rare-earth elements and combinations thereof, and the rare-earth elements comprise any one selected from the group consisting of La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, and Lu)
- NaY1-d-e-fNfF4:Yb3+d,Er3+e [Chemical Formula 10]
- (In Chemical Formula 10, d is a real number of 0≤d≤1, and e is a real number of 0≤e≤1, d and e are selected within a range satisfying a condition of 0<d+e≤1, f is a real number of 0≤f<1 and is selected within a range satisfying a condition of 0<d+e+f≤1, Nis any one selected from the group consisting of rare-earth elements and combinations thereof, and the rare-earth elements for N comprise any one selected from the group consisting of La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Tm, and Lu)
- NaLu1-g-h-iQiF4:Nd3+g,Yb3+h [Chemical Formula 11]
- (In Chemical Formula 11, g is a real number of 0<g≤1, h is a real number of 0≤h≤0.5 and is selected within a range satisfying a condition of 0<g+h≤1, i is a real number of 0≤i<1 and is selected within a range satisfying a condition of 0<g+h+i≤1, Q is any one selected from the group consisting of rare-earth elements and combinations thereof, and the rare-earth elements for Q comprise any one selected from the group consisting of La, Ce, Pr, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, and Y)
- NaY1-jRjF4 [Chemical Formula 12]
- (In Chemical Formula 12, j is selected within a range satisfying a condition of a real number of 0≤j≤1, R is any one selected from the group consisting of rare-earth elements and combinations thereof, and the rare-earth elements for R comprise any one selected from the group consisting of La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, and Lu)
- NaEr1-a-bLbF4:Tm3+a [Chemical Formula 13]
- (In Chemical Formula 13, a is a real number of 0≤a≤0.5, b is a real number of 0≤b<1 and 0≤a+b<1 and is selected within a range satisfying a+b<1, and L is any one selected from the group consisting of Y, La, Ce, Pr, Nd, Pm, Sm, Eu, Tb, Dy, Ho, Yb, Lu, Gd, and combinations thereof)
- NaY1-mZmF4 [Chemical Formula 14]
- (In Chemical Formula 14, m is selected within a range satisfying a condition of a real number of 0≤m≤1, Z is any one selected from the group consisting of rare-earth elements and combinations thereof, and the rare-earth elements for Z comprise any one selected from the group consisting of La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, and Lu).
20 more elements
Dependencies are inferred from the claim text.