Organic electroluminescent element having stacked light emitting units
AssigneeXianyang Chvt New Display Technology Co., Ltd.
InventorsJunichi Tanaka, Mitsuru Morimoto
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Abstract
This organic EL element has one blue light emitting unit, and has a continuous emission spectrum. The organic EL element has one or two peak wavelengths in a blue light wavelength range of 440 nm-490 nm within this emission spectrum, the correlated color temperature of white light is 3300K or greater, and according to a special color rendering index (Ri) of white light, R6 is 60 or greater and R12 is 30 or greater.
Claims28
An organic electroluminescent element having a structure in which a plurality of light emitting units each including a light emitting layer made of at least an organic compound are stacked one on top of another between a first electrode and an second electrode with a charge generating layer sandwiched between each pair of the adjacent light emitting units, characterized in that
- the organic electroluminescent element comprises at least one blue light emitting unit including a light emitting layer formed of a blue light emitting layer which emits blue light with one or two peak wavelengths in a blue wavelength band,
- white light produced by light emission of the plurality of light emitting units has an emission spectrum continuous over a wavelength band of at least 380 nm to 780 nm and has one or two peak wavelengths in a blue wavelength band of 440 nm to 490 nm in the emission spectrum,
- correlated color temperature of the white light is 3300 K or higher, and
- R6 and R12 among special color rendering indices (Ri) of the white light are 60 or more and 30 or more, respectively.
Dependencies are inferred from the claim text.