White light-emitting organic electroluminescent element and white light-emitting organic electroluminescent panel
First Claim
Patent Images
1. A white light-emitting organic electroluminescent element comprising:
- a cathode,an anode, andat least four kinds of light-emitting dopants including a light-emitting dopant “
A”
, a light-emitting dopant “
B”
, a light-emitting dopant “
C”
, and a light emitting dopant “
D”
, the at least four kinds of light-emitting dopants being located between the cathode and the anode,whereina peak wavelength of the light emitting dopant “
A”
is shorter than a peak wavelength of the light emitting dopant “
B”
, the peak wavelength of the light emitting dopant “
B”
is shorter than a peak wavelength of the light emitting dopant “
C”
, and the peak wavelength of the light emitting dopant “
C”
is shorter than a peak wavelength of the light emitting dopant “
D”
,whereinwhena first luminance is a luminance at the peak wavelength of the light-emitting dopant “
A”
, a second luminance is a luminance at the peak wavelength of the light-emitting dopant “
D”
, a third luminance is a luminance at the peak wavelength of the light-emitting dopant “
C” and
a fourth luminance is a luminance at the peak wavelength of the light-emitting dopant “
B”
, andwhena normal direction of the white light-emitting organic electroluminescent element is in the 0°
direction;
a first average luminance is an average luminance of the first luminance in a range of 50°
to 70°
,a second average luminance is an average luminance of the second luminance in a range of 50°
to 70°
,a third average luminance is an average luminance of the third luminance in a range of 50°
to 70°
, anda fourth average luminance is an average luminance of the fourth luminance in a range of 50°
to 70°
, anda first front luminance is a luminance of the first luminance in the normal direction,a second front luminance is a luminance of the second luminance in the normal direction,a third front luminance is a luminance of the third luminance in the normal direction, anda fourth front luminance is a luminance of the fourth luminance in the normal direction,whereina first ratio of the first average luminance to the first front luminance is more than a second ratio of the second average luminance to the second front luminance, anda third ratio of the third average luminance to the third front luminance is more than a fourth ratio of the fourth average luminance to the fourth front luminance.
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Abstract
A white light-emitting organic electroluminescent element includes at least four kinds of light-emitting dopants with different emission peak wavelengths which are present between a cathode and an anode. The four kinds of light-emitting dopants include a light-emitting dopant “A”, a light-emitting dopant “B”, a light-emitting dopant “C”, and a light-emitting dopant “D” having their own peak wavelengths which are longer in this order. The white light-emitting organic electroluminescent element has an emission spectrum which satisfies relations of: (first average luminance for an angle in a range of 50° to 70°/first front luminance)>(second average luminance for an angle in a range of 50° to 70°/second front luminance); and (third average luminance for an angle in a range of 50° to 70°/third front luminance)>(fourth average luminance for an angle in a range of 50° to 70°/fourth front luminance).
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Citations
13 Claims
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1. A white light-emitting organic electroluminescent element comprising:
-
a cathode, an anode, and at least four kinds of light-emitting dopants including a light-emitting dopant “
A”
, a light-emitting dopant “
B”
, a light-emitting dopant “
C”
, and a light emitting dopant “
D”
, the at least four kinds of light-emitting dopants being located between the cathode and the anode,wherein a peak wavelength of the light emitting dopant “
A”
is shorter than a peak wavelength of the light emitting dopant “
B”
, the peak wavelength of the light emitting dopant “
B”
is shorter than a peak wavelength of the light emitting dopant “
C”
, and the peak wavelength of the light emitting dopant “
C”
is shorter than a peak wavelength of the light emitting dopant “
D”
,wherein when a first luminance is a luminance at the peak wavelength of the light-emitting dopant “
A”
, a second luminance is a luminance at the peak wavelength of the light-emitting dopant “
D”
, a third luminance is a luminance at the peak wavelength of the light-emitting dopant “
C” and
a fourth luminance is a luminance at the peak wavelength of the light-emitting dopant “
B”
, andwhen a normal direction of the white light-emitting organic electroluminescent element is in the 0°
direction;a first average luminance is an average luminance of the first luminance in a range of 50°
to 70°
,a second average luminance is an average luminance of the second luminance in a range of 50°
to 70°
,a third average luminance is an average luminance of the third luminance in a range of 50°
to 70°
, anda fourth average luminance is an average luminance of the fourth luminance in a range of 50°
to 70°
, anda first front luminance is a luminance of the first luminance in the normal direction, a second front luminance is a luminance of the second luminance in the normal direction, a third front luminance is a luminance of the third luminance in the normal direction, and a fourth front luminance is a luminance of the fourth luminance in the normal direction, wherein a first ratio of the first average luminance to the first front luminance is more than a second ratio of the second average luminance to the second front luminance, and a third ratio of the third average luminance to the third front luminance is more than a fourth ratio of the fourth average luminance to the fourth front luminance. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A white light-emitting organic electroluminescent panel, comprising:
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a whitelight-emitting organic electroluminescent element comprising; a cathode, an anode, and at least four kinds of light-emitting dopants including a light-emitting dopant “
A”
, alight-emitting dopant“
B”
, a light-emittingdopant“
C”
,and a light emitting dopant“
D”
, the at least four kinds of light-emitting dopants being located between the cathode and the anode,wherein a peak wavelength of the light emitting dopant“
A”
is shorter than a peak wavelength of the light emitting dopant “
B”
, the peak wavelength of the light emitting dopant “
B”
is shorter than a peak wavelength of the light emitting dopant “
C”
, and the peak wavelength of the light emitting dopant “
C”
is shorter than a peak wavelength of the light emitting dopant “
D”
,wherein when a first luminance is a luminance at the peakwave length of the light-emitting dopant “
A”
, a second luminance is aluminance at the peak wavelength of the light-emitting dopant“
D”
, a third luminance is a luminance at the peak wavelength of the light-emitting dopant “
C” and
a fourth luminance is a luminance at the peak wavelength of the light-emitting dopant “
B”
, andwhen a normal direction of the white light-emitting organic electroluminescent element is in the 0°
direction;a first average luminance is an average luminance of the first luminance in a range of 50°
to 70°
,a second average luminance is an average luminance of the second luminance in a range of 50°
to 70°
,a third average luminance is an average luminance of the third luminance in a range of 50°
to 70°
,anda fourth average luminance is an average luminance of the fourth luminance in a range of 50°
to 70°
, anda first front luminance is a luminance of the first luminance in the normal direction, a second front luminance is a luminance of the second luminance in the normal direction, a third front luminance is a luminance of the third luminance in the normal direction, and a fourth front luminance is a luminance of the fourth luminance in the normal direction, wherein a first ratio of the first average luminance to the first front luminance is more than a second ratio of the second average luminance to the second front luminance, and a third ratio of the third average luminance to the third front luminance is more than a fourth ratio of the fourth average luminance to the fourth front luminance; and a light diffusion layer scattering light and disposed on a light-extracting face of the white light-emitting organic electroluminescent element.
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Specification
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Current AssigneeSamsung Display Company Limited (Samsung Electronics Co. Ltd.)
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Original AssigneePanasonic Intellectual Property Management Co., Ltd. (Panasonic Holdings Corporation)
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InventorsKuzuoka, Yoshikazu, Tsuji, Hiroya, Sasaki, Hiroyuki, Ohara, Satoshi, Yamae, Kazuyuki
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Primary Examiner(s)Li, Meiya
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Assistant Examiner(s)Albrecht, Peter M
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Application NumberUS14/006,447Publication NumberTime in Patent Office1,341 DaysField of Search257/40, 257/59, 257/72, 257/759, 257/E27.117, 257/E51.001, 257/E51.002, 257/E51.007, 257/E51.022, 257/E51.024, 178/17.D, 178/19.03, 313/483, 313/500, 313/504, 313/509, 345/39, 345/46, 345/82, 345204-206, 345/694, 349/38, 349/39, 349/51, 349/52US Class Current1/1CPC Class CodesH10K 50/12 comprising dopantsH10K 50/125 specially adapted for multi...H10K 59/32 Stacked devices having two ...
