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Light-emitting device and backlight including light-emitting device

  • US 10,529,695 B2
  • Filed: 08/01/2016
  • Issued: 01/07/2020
  • Est. Priority Date: 08/04/2015
  • Status: Active Grant
First Claim
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1. A light-emitting device, comprising:

  • a first light-emitting element having an emission peak wavelength of 430 nm or more and less than 490 nm;

    a second light-emitting element having an emission peak wavelength of 490 nm or more and 570 nm or less;

    a support body at which the first light-emitting element and the second light-emitting element are disposed; and

    a light-transmissive member containing a red phosphor and covering the first light-emitting element and the second light-emitting element, whereina content density of the red phosphor in the light-transmissive member located in a space between the first light-emitting element and the second light-emitting element is higher in a part below an upper surface of the second light-emitting element than in a part above the upper surface thereof, andthe red phosphors located in the light-transmissive member in a space between the first light-emitting element and the second light-emitting element settle out so as to be in contact with each other,wherein the red phosphor includes a phosphor having a composition represented by the following formula (II);


    (x−

    a
    )MgO.a(Ma)O.b/2(Mb)2O3.yMgF2.c(Mc)X2.(1

    d−

    e
    )GeO2.d(Md)O2.e(Me)2O3;

    Mn4+



    (II)wherein Ma is at least one element selected from Ca, Sr, Ba and Zn;

    Mb is at least one element selected from Sc, La and Lu;

    Mc is at least one element selected from Ca, Sr, Ba and Zn;

    X is at least one element selected from F and Cl;

    Md is at least one element selected from Ti, Sn and Zr; and

    Me is at least one element selected from B, Al, Ga and In, furthermore, x, y, a, b, c, d and e are set to satisfy the following ranges;

    2≤

    x≤

    4;

    0<

    y≤

    2;

    0≤

    a≤

    1.5;

    0≤

    b<

    1;

    0≤

    c≤

    2;

    0≤

    d≤

    0.5; and

    0≤

    e<

    1.

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