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Excitation-Dependent Emissive Properties of Silicate Phosphor for Light Converted LEDs
Baojiu Chen,정준호,M. Jayasimhadri,장기완,Ho Sueb Lee,Eunjin Cho,Soung Soo Yi,정중현 한국물리학회 2009 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.55 No.4
A phosphor with the designed composition 1.99SrO2-1.0MgO-1.6SiO2-0.01Eu2O3 was prepared via a solid state reaction in a reducing atmosphere (90%N2/10%H2). The crystal structure of the phosphor was identified by using X-ray diffraction (XRD). The morphology of the phosphor particles was examined by using scanning electron microscopy (SEM). The optical properties of the emission spectra and the chromaticity coordinates were studied. The emission spectra were found to depend on the excitation wavelengths; thus colors in a wide region could be obtained by combining the prepared phosphor and light-emitting diodes (LEDs) with proper emitting wavelengths.
Co-precipitation synthesis and characterization of Bi3+, Eu3+ co-doped nanocrystal Gd2WO6 phosphors.
Tian, Yue,Chen, Baojiu,Hua, Ruinian,Cheng, Lihong,Zhong, Haiyang,Sun, Jiashi,Wang, Bo,Wan, Jing,Lu, Weili,Jang, Kiwan American Scientific Publishers 2010 Journal of nanoscience and nanotechnology Vol.10 No.3
<P>Eu3+ single-doped and Bi3+/Eu3+ co-doped nanocrystal Gd2WO6 phosphors were successfully synthesized via a co-precipitation reaction. The structure and morphology of the phosphors were characterized by using X-ray powder diffraction (XRD) and field emission scanning electron microscopy (FE-SEM). The influence of Bi(3+)-doping concentration on the excitation and emission spectra was studied. It was found that the introduction of Bi3+ can greatly affect the charge transfer band and the luminescence intensity of Eu3+ but does not cause a change in the profile of emission spectra of Eu3+.</P>
Optical temperature sensing properties of Yb3+/Tm3+ co-doped NaLuF4 crystals
Lili Tong,Xiangping Li,Ruinian Hua,Lihong Cheng,Jiashi Sun,Jinsu Zhang,Sai Xu,Hui Zheng,Yanqiu Zhang,Baojiu Chen 한국물리학회 2017 Current Applied Physics Vol.17 No.7
Yb3þ/Tm3þ and Yb3þ/Er3þ co-doped NaLuF4 crystals were synthesized by a facile hydrothermal method. The optical temperature sensing properties of Tm3þ based upon its two thermally coupled energy levels 3F2, 3 and 3H4 were systematically investigated by means of fluorescence intensity ratio (FIR) technique. The 980 nm laser-induced thermal effect on Tm3þ doped NaLuF4 crystals was studied by using Er3þ doped sample as thermal probe. The temperature sensitivity of Tm3þ in NaLuF4: Yb3þ/Tm3þ crystals shows a nonlinear dependence on temperature, and the maximum value is about 0.00045 K『1 at 600 K. The accuracy and reliability of the optical thermometry based on Tm3þ in NaLuF4: Yb3þ/Tm3þ crystals has been checked by using Yb3þ/Er3þ co-doped sample as temperature sensing unit. The results demonstrate that NaLuF4: Yb3þ/Tm3þ crystals have good sensing stability and may have potential application for the optical thermometry.