Light-emitting device, light-emitting apparatus, light-emitting module, electronic device, and lighting device
A light-emitting device that emits near-infrared light and emits visible light that is less likely to be seen is provided. The light-emitting device contains a light-emitting organic compound and a host material in a light-emitting layer. The maximum peak wavelength in an emission spectrum of the light-emitting device is greater than or equal to 750 nm and less than or equal to 900 nm. A luminance A and a radiance B of the light-emitting device satisfy 0≤A/B≤1.
1 . A light-emitting device comprising a light-emitting layer,
wherein the light-emitting layer comprises a light-emitting organic compound and a host material,
wherein the light-emitting organic compound is a cyclometalated complex,
wherein a maximum peak wavelength in an emission spectrum of the light-emitting device is greater than or equal to 750 nm and less than or equal to 900 nm,
wherein emission characteristics of the light-emitting device includes a luminance A [cd/m 2 ] and a radiance B [W/sr/m 2 ], and
wherein the luminance A [cd/m 2 ] and the radiance B [W/sr/m 2 ] satisfy 0<A/B<1 [cd·sr/W].
2 . A light-emitting device comprising a light-emitting layer,
wherein the light-emitting layer comprises a light-emitting organic compound and a host material,
wherein a maximum peak wavelength in an emission spectrum of the light-emitting device is greater than or equal to 750 nm and less than or equal to 900 nm,
wherein emission characteristics of the light-emitting device includes a luminance A [cd/m 2 ] and a radiance B [W/sr/m 2 ],
wherein the luminance A [cd/m 2 ] and the radiance B [W/sr/m 2 ] satisfy 0<A/B<1 [cd·sr/W], and
wherein a difference between a HOMO level of the host material and a LUMO level of the host material is greater than or equal to 1.35 eV and less than or equal to 2.25 eV.
3 . A light-emitting device comprising a light-emitting layer,
wherein the light-emitting layer comprises a light-emitting organic compound and a host material,
wherein a maximum peak wavelength in an emission spectrum of the light-emitting device is greater than or equal to 750 nm and less than or equal to 900 nm,
wherein emission characteristics of the light-emitting device includes a luminance A [cd/m 2 ] and a radiance B [W/sr/m 2 ],
wherein the luminance A [cd/m 2 ] and the radiance B [W/sr/m 2 ] satisfy 0<A/B<1 [cd·sr/W],
wherein the host material comprises a first organic compound and a second organic compound,
wherein a HOMO level of the first organic compound is higher than a HOMO level of the second organic compound, and
wherein a difference between the HOMO level of the first organic compound and a LUMO level of the second organic compound is smaller than a difference between a HOMO level of the light-emitting organic compound and a LUMO level of the light-emitting organic compound.
4 . The light-emitting device according to claim 3 ,
wherein the first organic compound and the second organic compound are substances that form an exciplex.
5 . The light-emitting device according to claim 3 ,
wherein the difference between the HOMO level of the first organic compound and the LUMO level of the second organic compound is greater than or equal to 1.35 eV and less than or equal to 2.25 eV.
6 . The light-emitting device according to claim 1 ,
wherein a rising wavelength of the maximum peak on a short wavelength side in the emission spectrum is greater than or equal to 650 nm.
7 . The light-emitting device according to claim 1 ,
wherein a rising wavelength of a maximum peak on a short wavelength side in an emission spectrum of the light-emitting organic compound in a solution is greater than or equal to 650 nm.
8 . The light-emitting device according to claim 1 ,
wherein an external quantum efficiency of the light-emitting device is greater than or equal to 1%.
9 . The light-emitting device according to claim 1 ,
wherein the light-emitting organic compound is an organometallic complex having a metal-carbon bond.
10 . The light-emitting device according to claim 9 ,
wherein the organometallic complex comprises a condensed heteroaromatic ring including 2 to 5 rings, and
wherein the condensed heteroaromatic ring is coordinated to the metal.
11 . A light-emitting apparatus comprising:
the light-emitting device according to claim 1 ; and
one or both of a transistor and a substrate.
12 . A light-emitting module comprising:
the light-emitting apparatus according to claim 11 ; and
one or both of a connector and an integrated circuit.
13 . An electronic device comprising:
the light-emitting module according to claim 12 ; and
at least one of an antenna, a battery, a housing, a camera, a speaker, a microphone, and an operation button.
14 . A lighting device comprising:
the light-emitting apparatus according to claim 11 ; and
at least one of a housing, a cover, and a support.
15 . The light-emitting device according to claim 2 ,
wherein the light-emitting organic compound is an organometallic complex having a metal-carbon bond.
16 . The light-emitting device according to claim 15 ,
wherein the organometallic complex comprises a condensed heteroaromatic ring including 2 to 5 rings, and
wherein the condensed heteroaromatic ring is coordinated to the metal.
17 . The light-emitting device according to claim 3 ,
wherein the light-emitting organic compound is an organometallic complex having a metal-carbon bond.
18 . The light-emitting device according to claim 17 ,
wherein the organometallic complex comprises a condensed heteroaromatic ring including 2 to 5 rings, and
wherein the condensed heteroaromatic ring is coordinated to the metal.