https://scholars.lib.ntu.edu.tw/handle/123456789/626502
標題: | Broadening Phosphor-Converted Light-Emitting Diode Emission: Controlling Disorder | 作者: | Chang, CY Majewska, N Chen, KC Huang, WT Lesniewski, T Leniec, G Kaczmarek, SM Pang, WK Peterson, VK Cherng, DH Lu, KM Mahlik, S RU-SHI LIU |
關鍵字: | NEAR-INFRARED PHOSPHORS; STRUCTURAL EVOLUTION; IN-VIVO; FLUORESCENCE; LUMINESCENCE; TRANSITION; EFFICIENT | 公開日期: | 2022 | 出版社: | AMER CHEMICAL SOC | 卷: | 34 | 期: | 22 | 起(迄)頁: | 10190 | 來源出版物: | CHEMISTRY OF MATERIALS | 摘要: | Near-infrared (NIR) phosphor-converted light-emitting diodes (pc-LEDs) are a highly efficient perspective NIR light source, with application hindered by a narrow emission band. In this work, we broaden the emission of a new series of NIR phosphors by controlling crystal structure disorder through cation cosubstitution. By substituting Ga3+with (Al0.68In0.32)3+, we create a Ga2-x(Al0.68In0.32)xO3:Cr3+phosphor series in which the average crystal size is maintained, while cation disorder varies. The increased deviation of the cation radii in the substitution leads to increased electron-phonon coupling, with a resulting emission spectrum covering the 650-1000 nm range with a 30% increase in the emission full width at half-maximum (FWHM) and a relatively high internal quantum efficiency of ∼80%. A transition from the β phase to the α phase, which differs in structure from the undoped parent, is created by the application of high pressure and possesses ultra-broad-band emission and an FWHM of ∼190 nm. This work shows that the emission bandwidth can be controlled through disorder and its influence on the Stokes shift, as captured by the effective Huang-Rhys factor. |
URI: | https://scholars.lib.ntu.edu.tw/handle/123456789/626502 | ISSN: | 0897-4756 | DOI: | 10.1021/acs.chemmater.2c03045 |
顯示於: | 化學系 |
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