施主受主共掺杂的荧光4H-SiC可以通过复合发出可见光,影响其发光性能的一个重要因素是施主-受主掺杂的浓度.本研究通过PVT生长方法制备了3英寸N-B-Al共掺的4H-SiC晶体,采用Raman光谱、SIMS对晶体的结晶类型和掺杂浓度进行了表征;采用PL发射谱和激发谱、荧光衰减曲线表征和内量子效率对晶体的发光波长、强度、施主-受主对复合发光性能进行了研究.结果发现,低浓度Al掺杂样品在室温下发出黄绿色荧光.低浓度Al掺杂在晶体中提供较少的受主;高浓度B、N掺杂形成施主,从而贡献充足的电子-空穴对.这些电子-空穴的复合提高了施主-受主对复合的内量子效率,进而增强光致发光强度,增加平均发光寿命.
参考文献
| [1] | Kamiyama S;Maeda T;Nakamura Y;Iwaya M;Amano H;Akasaki I;Kinoshita H;Furusho T;Yoshimoto M;Kimoto T.Extremely high quantum efficiency of donor-acceptor-pair emission in N-and-B-doped 6H-SiC[J].Journal of Applied Physics,20069(9):93108-1-93108-4-0. |
| [2] | J. W. Sun;T. Robert;A. Andreadou;A. Mantzari;V. Jokubavicius;R. Yakimova;J. Camassel;S. Juillaguet;E. K. Polychroniadis;M. Syvajarvi.Shockley-Frank stacking faults in 6H-SiC[J].Journal of Applied Physics,201211(11):113527-1-113527-8. |
| [3] | Satoshi Kamiyama;Motoaki Iwaya;Tetsuya Takeuchi;Isamu Akasaki;Rositza Yakimova;Mikael Syvaejaervi.White light-emitting diode based on fluorescent SiC[J].Thin Solid Films: An International Journal on the Science and Technology of Thin and Thick Films,2012:23-25. |
| [4] | J.W. Sun;V.Jokubavicius;R. Liljedahl;R. Yakimova;S. Juillaguet;J. Camassel;S. Kamiyama;M. Syvaejaervi.Room temperature luminescence properties of fluorescent SiC as white light emitting diode medium[J].Thin Solid Films: An International Journal on the Science and Technology of Thin and Thick Films,2012:33-35. |
| [5] | Hun Jae Chung;Marek Skowronski.High-resolution X-ray diffraction and optical absorption study of heavily nitrogen-doped 4H-SiC crystals[J].Journal of Crystal Growth,20031/2(1/2):52-60. |
| [6] | 王孝笑;杨琳;刘洪;陈强;肖定全;朱建国.低温水热法制备ZnS∶Co+Cr纳米晶及其光学性能研究[J].无机材料学报,2014(10):1049-1054. |
上一张
下一张
上一张
下一张
计量
- 下载量()
- 访问量()
文章评分
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%