Luminescence Wavelength Control of the High Efficient Pyranine Inclusion Inorganic Crystals by Adjusting pH

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  • pH変化による無機結晶内ピラニン包含高効率発光結晶の発光波長制御
  • pH ヘンカ ニ ヨル ムキ ケッショウ ナイ ピラニン ホウガン コウコウリツ ハッコウ ケッショウ ノ ハツ ヒカリハチョウ セイギョ

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High efficient emitting hybrid crystals were synthesized by cooling an aqueous solution of potassium sulfate (host) and 8-hydroxy-1,3,6-pyrenetrisulfonate (guest, Pyranine). The hybrid crystals emitted green luminescence on excitation with UV irradiation at 365 nm. Pyranine in the hybrid crystals retained the property of changing the wavelength of luminescence in response to a change of pH. Therefore, by adjusting the pH in the crystal preparation, it was possible to introduce different emission characteristics in the same crystal. These findings are expected to be applicable in simplifying the light-emitting layer in WOLEDs.

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