Electroluminescence device and display unit

An electroluminescence device, comprising:

• a luminescent layer having a multitude of electroluminescent particles distributed in a binder, said particles forming at least a first particle group and a second particle group;
• and
• electrodes for applying a voltage to said luminescent layer, wherein
• each of the electroluminescent particles forming said first particle group comprises a dielectric core having a first dielectric constant and a fluorescent coating layer made of a first fluorescent material,
• each of the electroluminescent particles forming said second particle group comprises a dielectric core having a second dielectric constant which is different from said first dielectric constant and a fluorescent coating layer made of a second fluorescent material, and
• said first and second fluorescent materials are fluorescent materials that produce the same luminescent color.

An electroluminescence device, comprising:

• at least two luminescent layers arranged in parallel or stacked in layers that produce different luminescent colors with each other;
• and
• electrodes for applying voltages to said at least two luminescent layers separately, wherein
• a first luminescent layer of said at least two luminescent layers has a multitude of electroluminescent particles distributed in a binder, said particles forming at least a first particle group, and each of the electroluminescent particles forming said first particle group comprising a dielectric core having a first dielectric constant and a fluorescent coating layer made of a first fluorescent material, a second luminescent layer of said at least two luminescent layers has a multitude of electroluminescent particles distributed in a binder, said particles forming at least a second particle group, and each of the electroluminescent particles forming said second particle group comprising a dielectric core having a second dielectric constant which is different from said first dielectric constant and a fluorescent coating layer made of a second fluorescent material that produces a luminescent color which is different from that of said first fluorescent material, and
• said first dielectric constant and said second dielectric constant are selected based on properties of the fluorescent coating layers, such that said first particle group and said second particle group have a substantially identical apparent voltage-brightness characteristic or a substantially identical deterioration pattern of an emission lifetime.

A display unit, comprising a display having a multitude of electroluminescence devices arranged two-dimensionally, wherein each of the electroluminescence devices comprises:

• a luminescent layer having a multitude of electroluminescent particles distributed in a binder, said particles forming at least a first particle group and a second particle group;
• and
• electrodes for applying a voltage to said luminescent layer, wherein
• each of the electroluminescent particles forming said first particle group comprises a dielectric core having a first dielectric constant and a fluorescent coating layer made of a first fluorescent material, each of the electroluminescent particles forming said second particle group comprises a dielectric core having a second dielectric constant which is different from said first dielectric constant and a fluorescent coating layer made of a second fluorescent material,
• said first and second fluorescent materials are fluorescent materials that produce different luminescent colors from each other, and
• said first dielectric constant and said second dielectric constant are selected based on properties of the fluorescent coating layers, such that said first particle group and said second particle group have a substantially identical apparent voltage-brightness characteristic or a substantially identical deterioration pattern of an emission lifetime.

A display unit, comprising a display having a multitude of electroluminescence devices arranged two-dimensionally, wherein each of the electroluminescence devices comprises:

• a luminescent layer having a multitude of electroluminescent particles distributed in a binder, said particles forming at least a first particle group and a second particle group;
• and
• electrodes for applying a voltage to said luminescent layer, wherein
• each of the electroluminescent particles forming said first particle group comprises a dielectric core having a first dielectric constant and a fluorescent coating layer made of a first fluorescent material,
• each of the electroluminescent particles forming said second particle group comprises a dielectric core having a second dielectric constant which is different from said first dielectric constant and a fluorescent coating layer made of a second fluorescent material, and
• said first and second fluorescent materials are fluorescent materials that produce the same luminescent color.

A display unit, comprising a display having a multitude of electroluminescence devices arranged two-dimensionally, wherein each of said electroluminescence devices comprises:

• at least two luminescent layers arranged in parallel or stacked in layers that produce different luminescent colors with each other;
• and
• electrodes for applying voltages to said at least two luminescent layers separately, wherein
• a first luminescent layer of said at least two luminescent layers has a multitude of electroluminescent particles distributed in a binder, said particles forming at least a first particle group, and each of the electroluminescent particles forming said first particle group comprising a dielectric core having a first dielectric constant and a fluorescent coating layer made of a first fluorescent material, a second luminescent layer of said at least two luminescent layers has a multitude of electroluminescent particles distributed in a binder, said particles forming at least a second particle group, and each of the electroluminescent particles forming said second particle group comprising a dielectric core having a second dielectric constant which is different from said first dielectric constant and a fluorescent coating layer made of a second fluorescent material that produces a luminescent color which is different from that of said first fluorescent material, and
• said first dielectric constant and said second dielectric constant are selected based on properties of the fluorescent coating layers, such that said first particle group and said second particle group have a substantially identical apparent voltage-brightness characteristic or a substantially identical deterioration pattern of an emission lifetime.

A method of manufacturing an electroluminescence device, said method comprising:

• forming a first electrode on a substrate;
• forming a luminescent layer on said first electrode such that said luminescent layer has a multitude of electroluminescent particles distributed in a binder, said electroluminescent particles form at least a first particle group and a second particle group, each of the electroluminescent particles forming said first particle group comprises a dielectric core having a first dielectric constant and a fluorescent coating layer made of a first fluorescent material, and each of the electroluminescent particles forming said second particle group comprises a dielectric core having a second dielectric constant which is different from said first dielectric constant and a fluorescent coating layer made of a second fluorescent material;
• and
• forming a second electrode such that said first electrode and said second electrode apply a voltage to said luminescent layer;
• wherein said forming said luminescent layer comprises:
• selecting said first fluorescent material and said second fluorescent material to produce different luminescent colors from each other;
• and
• selecting said first dielectric constant and said second dielectric constant based on properties of said fluorescent coating layers, such that said first particle group and said second particle group have a substantially identical apparent voltage-brightness characteristic or a substantially identical deterioration pattern of an emission lifetime.

A method of manufacturing an electroluminescence device, said method comprising:

• forming a first electrode on a substrate;
• forming a luminescent layer on said first electrode such that said luminescent layer has a multitude of electroluminescent particles distributed in a binder, said electroluminescent particles form at least a first particle group and a second particle group, each of the electroluminescent particles forming said first particle group comprises a dielectric core having a first dielectric constant and a fluorescent coating layer made of a first fluorescent material, and each of the electroluminescent particles forming said second particle group comprises a dielectric core having a second dielectric constant which is different from said first dielectric constant and a fluorescent coating layer made of a second fluorescent material;
• and
• forming a second electrode such that said first electrode and said second electrode apply a voltage to said luminescent layer;
• wherein said forming said luminescent layer comprises selecting said first fluorescent material and said second fluorescent material to produce the same luminescent color.