Panasonic Intellectual Property Management Co., Ltd.

Varutt Kittichungchit

Hiroya Tsuji

Kazuyuki Yamae

Hirofumi Kubota

Satoshi Ohara

Nobuhiro Ide

An organic electroluminescent element including at least three light-emitting units. The at least three light-emitting units include one or more short-wavelength light-emitting units having a weighted average emission wavelength &#x3bb;of 380 or more and less than 550 nm, and two or more long-wavelength light-emitting units having a weighted average emission wavelength &#x3bb;of 550 nm or more and 780 nm or less. The two or more long-wavelength light-emitting units are greater in number than the one or more short-wavelength light-emitting units.

Organic electroluminescent element and lighting device

The objective is to provide an organic electroluminescent element with an improved luminous efficiency. The organic electroluminescent element has a structure in which a first light-emitting unit containing a phosphorescent red light-emitting material, a second light-emitting unit containing a phosphorescent yellow light-emitting material, and a third light-emitting unit containing a fluorescent blue light-emitting material are stacked with interlayers in-between. A peak emission wavelength of the phosphorescent yellow light-emitting material is in a range of 530 nm to 570 nm. A peak emission wavelength of the fluorescent blue light-emitting material is in a range of 440 nm to 480 nm. The organic electroluminescent element has a ratio of a yellow emission intensity to a blue emission intensity in a range of 1.0 to 2.0. The organic electroluminescent element further has a ratio of a red emission intensity to the blue emission intensity in a range of 1.5 to 3.0.

Organic electroluminescent element

The disclosure relates to an organic electroluminescence element including an organic layer including multiple light-emitting layers. The light-emitting layers include a blue light-emitting layer including a blue light-emitting dopant. In a case where emission color of the organic electroluminescence element operated at an operation temperature for a stable state is represented in a CIE1931 chromaticity coordinate system, when coordinate point A of the emission color at an early stage of use and coordinate point B of the emission color deteriorated by use are represented by (x, y) and (x, y) respectively, a relation of y&#x2267;yis satisfied. When amounts of changes in x and y values from coordinate point A to coordinate point B are represented by equations of &#x394;x=x&#x2212;xand &#x394;y=y&#x2212;yrespectively, a relation of &#x394;y&#x2267;&#x394;x is satisfied. It can be made difficult to perceive change in emission color and lifetime can be prolonged

Organic electroluminsescence element and lighting device

The object of the present invention is to provide an organic electroluminescent element suitable for both food lighting at a high temperature and indoor lighting at room temperature. The organic electroluminescent element according to the present invention has such characteristics that: an element temperature at which a general color rendering index Ra has its maximum in an element temperature range of 5&#xb0; C. to 60&#xb0; C. is present in a range of 15&#xb0; C. to 35&#xb0; C.; and an element temperature at which at least one of a color rendering index R8 a special color rendering index R9, a special color rendering index R14, and a special color rendering index R15 has its maximum in the element temperature range of 5&#xb0; C. to 60&#xb0; C. is in a range of temperatures higher than the element temperature at which the general color rendering index Ra has its maximum.

Organic electroluminescent element, lighting fixture, and food storage device

The object of the present invention is to provide an organic electroluminescent element suitable for both food lighting at a low temperature and indoor lighting at room temperature. The organic electroluminescent element according to the present invention has such characteristics that a maximum of a general color rendering index Ra in a range of an element temperature of 5&#xb0; C. to 60&#xb0; C. is present in a range of the element temperature of 15&#xb0; C. to 35&#xb0; C. and that at least one of maxima of special color rendering indexes R, R, R, and Rin the range of the element temperature of 5&#xb0; C. to 60&#xb0; C. is present in a range of the element temperature of 5&#xb0; C. to 35&#xb0; C.

The present invention proposes a white organic electroluminescent element which is a multiunit element capable of emitting high intensity light that is important to a light source for lighting use, and can have an extended lifetime while suppressing deterioration in luminance. The organic electroluminescent element includes: a transparent electrode; and a first light-emitting unit including a blue fluorescent light-emitting layer containing a blue fluorescent light-emitting material; an intermediate layer; and a second light-emitting unit including a red phosphorescent light-emitting layer containing a red phosphorescent light-emitting material and a green phosphorescent light-emitting layer containing a green phosphorescent light-emitting material; and a reflecting electrode, wherein: the first and second light-emitting units are stacked having the intermediate layer interposed therebetween; and a film thickness (tR) of the red phosphorescent light-emitting layer and a film thickness (tG) of the green phosphorescent light-emitting layer satisfy a relation of 5*tR&#x2266;tG.

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Osaka, Japan

Varutt Kittichungchit