소개글
디스플레이실험-Photoluminescence property of Lu3Al5O12Ce3+ phosphor by addition of GdO2 for white LED applications에 대한 자료입니다.
목차
1.Introduction
2.Experimental Method
3.Results
4.Conclusion
5.References
본문내용
Introduction
Problems of YAG
Difficult to control CRI
Wavelength between blue light and yellow light
The samples were ground with an agate mortar, then fired at 1550 ℃ for 10hours.
Result Analysis
Intensity according to fraction of Ce3+ ion : 0.15 > 0.21 > 0.09 > 0.03
Intensity is largest at 0.15. Why?
* Concentration Quenching :
Too much activator concentration
->Reabsorption of light increases
->non-radiactive transition increases
->Light emission decreases
* Red shift
Ionic radius :
Lu3+ : 0.86Å, Ce3+ : 1.06Å
Lu3+ is substituted by Ce3+
->Decrease band gap
->Lower emission energy
->Increase wave length
참고문헌
Liu Y, Zhang X, Hao Z, Wang X, Zhang J. Chem commun 2011;47;10677
Blasse G, Bril A. Appl Phys Lett 1967;11:53
Lee SH, Yi JH, Kim JH, Ko YN, Kang YC. Opt Mater 2011;33:538
Nag A, Kutty TRN. J Alloys Compd 2003;54:221
Li HL, Liu XJ, Huang LP. Opt mater 2007;29:1138
Nersisyan Hayk, Won Hyung Il, Won chang Whan. Chem Commun 2011;47:11897