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北海道大学技術:赤色発光体(青色光励起型):HK25-005

青色LEDを高色純度の赤色光に効率良く変換

 蛍光体は照明やディスプレイに活用されており、近年では無機蛍光体のほか、蛍光色素等も注目されている。しかし、従来の赤色蛍光体は、耐久性の制限、紫外線のみによる励起、あるいは材料の毒性の問題により、次世代LED、ディスプレイ、センサーへの応用に課題があった。  ユーロピウム(Eu)と有機分子からなる錯体は、紫外光励起で赤色に強発光し、色純度も高いため発光体材料として有望である。しかし、従来のEu錯体は青色光の長波長域における吸収能が低いため、白色LEDへの適用ができなかった。  本発明はEu(III)に縮合多環芳香族基に基づく新型カーボン構造を導入した錯体であり、青色光(450 nm)励起による高輝度な赤色発光を実現した。本錯体は高色純度、高耐久性を有し、量子ドットのような毒性を含まない発光体である。

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  • Luminescent materials

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[Stress Luminescence Technology - Application Example] Advancement of Automotive Simulations such as Collisions

Stress luminescence technology that glows when force is applied. Here are examples of its application in simulations of impact collisions.

<What is stress photoluminescence?> The core of stress photoluminescence technology is stress photoluminescent particles (ceramics, with a representative material being SrAl2O4:Eu2+, emitting green light). This stress photoluminescent material is applied as a coating or sheet to the area of interest where "force information" is desired. When a load is applied, the resulting stress photoluminescence is captured using a camera, allowing us to see where the force is applied and the extent of the strain that occurs. This is "stress photoluminescence." <Examples of stress photoluminescence applications> *Provided by AIST ■Target: Vehicles ■Development example: Enhancing simulations using stress photoluminescence as training data *For more details, please refer to the PDF document or contact us.

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  • Luminescent materials

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