Light-emitting element using spirofluorene derivative and electronic appliance
一种发光器件、电极的技术，应用在电气元件、发光材料、电路等方向，能够解决不容易产生三重态激发分子等问题
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Embodiment approach 1
[0097] In Embodiment Mode 1, the concept of the light emitting element of the present invention will be described.
[0098] In recent years, the present inventors have focused on phosphorescent compounds to achieve high performance of light-emitting elements, and have studied light-emitting elements using a wide range of phosphorescent compounds. As one of the results, the present inventors found that by using a spiro-9,9'-bifluorene derivative to which one amino group is attached, a light-emitting element comprising the phosphorescent compound of the present invention can Light emitting elements can emit light very efficiently.
[0099] Through the performance evaluation conducted by the present inventors, it has been found that the T of spiro-9,9'-bifluorene derivatives 1 High level. That is, it has been found that triplet excitation energy is difficult to transfer from other layers to a layer including a spiro-9,9'-bifluorene derivative. Therefore, little attention is pa...
Embodiment approach 2
[0106] In Embodiment 2, reference will be made to figure 1 The structure of the light-emitting element of the present invention will be described.
[0107] figure 1 A light-emitting element having a layer 120 containing an organic compound between the first electrode 101 and the second electrode 104 is shown. The layer 120 containing an organic compound includes a first layer 102 containing a spiro-9,9'-bifluorene derivative and a second layer 103 containing a phosphorescent compound.
[0108] Here, the second layer 103 containing the phosphorescent compound is preferably a layer in which a substance having a larger triplet excitation energy than the phosphorescent compound is used as a host material and the phosphorescent compound is dispersed as a guest material. Dispersing the phosphorescent compound, which is a substance serving as an emission center, prevents light emitted from the phosphorescent compound, which is a substance serving as an emission center, from being q...
Embodiment approach 3
[0207] In Embodiment Mode 3, a light-emitting element having an element structure different from Embodiment Mode 2 in which a plurality of first layers containing a spiro-9,9'-bifluorene derivative and a second layer containing a phosphorescent compound are provided is exemplified, And each second layer comprising a phosphorescent compound emits light. Therefore, combined light of light emitted from a plurality of light emitting layers can be obtained. In Embodiment 3, reference will be made to figure 2 A mode of a light-emitting element including a plurality of first layers containing a spiro-9,9'-bifluorene derivative and a plurality of second layers containing a phosphorescent compound will be described.
[0208] figure 2 The light emitting element in includes a layer A 203 containing an organic compound and a layer B 206 containing an organic compound between the first electrode 201 and the second electrode 202 . The layer A 203 containing an organic compound includes...
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Abstract
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