1. A light-emitting device comprising:
a first electrode;
a light-emitting layer over the first electrode, the light-emitting layer comprising a host material, a first guest material, and a second guest material; and
a second electrode over the light-emitting layer,
wherein the light-emitting layer comprises a first light-emitting layer and a second light-emitting layer which are in contact with each other,
wherein the host material and the first guest material are included in the first light-emitting layer,
wherein the host material and the second guest material are included in the second light-emitting layer,
wherein a T1 level of the host material is lower than a T1 level of the first guest material and higher than a T1 level of the second guest material, and
wherein a difference in T1 level between the host material and the first guest material is larger than 0 eV and less than or equal to 0.2 eV.
2. The light-emitting device according to claim 1,
wherein the first guest material and the second guest material each are an organometallic compound.
3. The light-emitting device according to claim 1,
wherein a rate constant of a radiative transition of the second guest material is larger than 5\xd7105 sec\u22121.
4. The light-emitting device according to claim 1,
wherein a rate constant of a non-radiative transition of the host material is smaller than 1\xd7102 sec\u22121.
5. The light-emitting device according to claim 1,
wherein an emission from the light-emitting layer exhibits a multicomponent decay curve, and
wherein a lifetime of the emission is less than or equal to 15 \u03bcsec where the lifetime is a time required for the emission to decrease in intensity to 1100 of an initial value thereof.
6. The light-emitting device according to claim 5,
wherein the lifetime of the emission is less than or equal to 10 \u03bcsec.
7. The light-emitting device according to claim 5,
wherein the lifetime of the emission is less than or equal to 5 \u03bcsec.
8. An electronic device comprising the light-emitting device according to claim 1.
9. A lighting device comprising the light-emitting device according to claim 1.
10. The light-emitting device according to claim 1,
wherein the light-emitting layer further comprises an organic compound,
wherein a T1 level of the organic compound is lower than the T1 level of the first guest material and higher than the T1 level of the second guest material.
11. The light-emitting device according to claim 1,
wherein the first light-emitting layer consists of the host material and the first guest material, and
wherein the second light-emitting layer consists of the host material and the second guest material.
12. A light-emitting device comprising:
a first electrode;
a first EL layer over the first electrode;
a charge generation layer over the first EL layer;
a second EL layer over the charge generation layer; and
a second electrode over the second EL layer,
wherein at least one of the first EL layer and the second EL layer comprises a light-emitting layer which comprises a host material, a first guest material, and a second guest material,
wherein the light-emitting layer comprises a first light-emitting layer and a second light-emitting layer which are in contact with each other,
wherein the host material and the first guest material are included in the first light-emitting layer,
wherein the host material and the second guest material are included in the second light-emitting layer,
wherein a T1 level of the host material is lower than a T1 level of the first guest material and higher than a T1 level of the second guest material, and
wherein a difference in T1 level between the host material and the first guest material is larger than 0 eV and less than or equal to 0.2 eV.
13. The light-emitting device according to claim 12,
wherein the first guest material and the second guest material each are an organometallic compound.
14. The light-emitting device according to claim 12,
wherein a rate constant of a radiative transition of the second guest material is larger than 5\xd7105 sec\u22121.
15. The light-emitting device according to claim 12,
wherein a rate constant of a non-radiative transition of the host material is smaller than 1\xd7102 sec\u22121.
16. The light-emitting device according to claim 12,
wherein an emission from the light-emitting layer exhibits a multicomponent decay curve, and
wherein a lifetime of the emission is less than or equal to 15 \u03bcsec where the lifetime is a time required for the emission to decrease in intensity to 1100 of an initial value thereof.
17. The light-emitting device according to claim 16,
wherein the lifetime of the emission is less than or equal to 10 \u03bcsec.
18. The light-emitting device according to claim 16,
wherein the lifetime of the emission is less than or equal to 5 \u03bcsec.
19. An electronic device comprising the light-emitting device according to claim 12.
20. A lighting device comprising the light-emitting device according to claim 12.
21. The light-emitting device according to claim 12,
wherein the light-emitting layer further comprises an organic compound,
wherein a T1 level of the organic compound is lower than the T1 level of the first guest material and higher than the T1 level of the second guest material.
22. The light-emitting device according to claim 12,
wherein the first light-emitting layer consists of the host material and the first guest material, and
wherein the second light-emitting layer consists of the host material and the second guest material.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A display device for a notebook computer, comprising:
a cover having an inner surface;
a resilient piece including a main plate spaced apart from and parallel to said inner surface of said cover, a first through hole formed in said main plate, and two arm units respectively extending from two opposite lateral ends of said main plate and fixed to said inner surface of said cover;
a display panel including a panel module disposed on said inner surface of said cover, a frame surrounding fixedly a periphery of said panel module, a protruding portion protruding from said frame in a direction parallel to said inner surface of said cover and corresponding in position to said resilient piece, and a second through hole formed in said protruding portion and registered with said first through hole;
a bezel including a bezel body covering said display panel at a side that is distal from said cover, and a third through hole formed in said bezel body and registered with said second through hole; and
a shock absorbing positioner including a pad body abutting against a surface of said bezel body that is distal from said display panel, and a positioning post protruding from one side of said pad body that is proximate to said bezel body, said positioning post being inserted consecutively and frictionally through said third through hole, said second through hole and said first through hole to fix together said bezel, said display panel and said resilient piece.
2. The display device as claimed in claim 1, wherein said resilient piece further includes a first positioning hole formed in said main plate and spaced apart from said first through hole, said protruding portion of said display panel being formed with a second positioning hole that is registered with said first positioning hole, said bezel further including a third positioning hole formed in said bezel body and registered with said second positioning hole, said display panel further including an auxiliary positioning element that includes a base portion having an outer diameter matching a hole diameter of said first positioning hole so as to be frictionally positioned therein, a spacer portion connected to said base portion and having an outer diameter larger than that of said base portion, and an extension portion extending from said spacer portion into said second and third positioning holes.
3. The display device as claimed in claim 2, wherein said extension portion of said auxiliary positioning element has an outer diameter smaller than a hole diameter of said second and third positioning holes, said auxiliary positioning element further including a positioning cap having an inner diameter matching that of said extension portion, and an outer diameter matching the hole diameter of said second and third positioning holes, said positioning cap being frictionally sleeved on said extension portion and being frictionally positioned in said second and third positioning holes.
4. The display device as claimed in claim 3, wherein said extension portion of said auxiliary positioning element has an outer surface formed with a plurality of projections.
5. The display device as claimed in claim 1, wherein said cover is provided with two spaced-apart limiting bodies corresponding in position to said resilient piece, each of said limiting bodies including a surrounding wall connected transversely to said inner surface of said cover, and a limiting wall connected to said surrounding wall and disposed oppositely of and parallel to said inner surface of said cover, said surrounding wall and said limiting wall of each of said limiting bodies cooperating with said inner surface of said cover to define a receiving space having an opening, said openings of said receiving spaces of said limiting bodies facing each other, said arm units of said resilient piece being bent arcuately in opposite directions after respectively extending from said two opposite lateral ends of said main plate toward said casing and being inserted respectively into said receiving spaces via said openings.
6. The display device as claimed in claim 5, wherein each of said arm units is configured as a bent plate, and is formed with an elongated slot.
7. The display device as claimed in claim 6, wherein said resilient piece further includes a clamping portion configured to clamp said protruding portion of said display panel, said clamping portion having a connecting plate extending transversely from an outer end of said main plate that is between said two opposite lateral ends thereof in a direction away from said cover, and a clamping plate extending from an end of said connecting plate that is distal from said main plate toward an inner end of said main plate that is opposite to said outer end.
8. The display device as claimed in claim 7, wherein said resilient piece and said frame and said protruding portion of said display panel are made of metal or are sputtered with metallic substances on surfaces thereof.
9. The display device as claimed in claim 6, wherein said cover further has a clamping portion formed on said inner surface thereof and disposed in a position corresponding to said resilient piece to clamp said protruding portion of said display panel, said clamping portion having a connecting plate extending from said inner surface of said cover and passing through an outer end of said main plate that is between said two opposite lateral ends thereof in a direction away from said cover, and a clamping plate extending from an end of said connecting plate that is distal from said main plate toward an inner end of said main plate that is opposite to said outer end.
10. The display device as claimed in claim 9, wherein said connecting plate has a wavy shape, and the wavy pattern of said connecting plate is such that a line that is tangent to a crest point of each wave and a line that connects the crest point and an adjacent trough point form therebetween an included angle that is smaller than 45 degrees.
11. The display device as claimed in claim 9, wherein said clamping portion and said frame and said protruding portion of said display panel are made of metal or are sputtered with metallic substances on surfaces thereof.
12. The display device as claimed in claim 1, wherein said resilient piece further includes a stud extending from a surface of said main plate that is distal from said cover, said stud being spaced apart from said first through hole, said protruding portion of said display panel being formed with a positioning hole to receive said stud.
13. The display device as claimed in claim 12, wherein each of said arm units of said resilient piece includes a pair of wavy arms connected between said main plate and said inner surface of said cover, and the wavy pattern of each of said wavy arms is such that a line that is tangent to a crest point of each wave and a line that connects the crest point and an adjacent trough point form therebetween an included angle that is smaller than 45 degrees.
14. The display device as claimed in claim 12, wherein said resilient piece further includes an auxiliary resilient member disposed between said first through hole and said stud, said auxiliary resilient member being formed on said main plate distal from said cover by stamping, and having a substantially L-shaped body configured to contact said protruding portion.
15. The display device as claimed in claim 13, wherein said resilient piece further includes an auxiliary resilient member disposed between said first through hole and said stud, said auxiliary resilient member being formed on said main plate distal from said cover by stamping, and having a substantially L-shaped body configured to contact said protruding portion.
16. The display device as claimed in claim 1, wherein said positioning post of said shock absorbing positioner has a peripheral surface formed with a first annular groove that is distal from said pad body, and a second annular groove that is proximate to said pad body, said resilient piece being retained in said first annular groove and said bezel and said protruding portion of said display panel being retained in said second annular groove when said positioning post extends consecutively through said third through hole, said second through hole and said first through hole.
17. The display device as claimed in claim 1, wherein said first through hole has a hole diameter smaller than that of said second and third through holes, said positioning post having a peripheral surface formed with an annular groove, said resilient piece being retained in said annular groove and said protruding portion and said bezel being retained between said annular groove and said pad body when said positioning post extends consecutively through said third through hole, said second through hole and said first through hole.