Structural and optical investigation of GaInP quantum dots according to the growth thickness for the 700 nm light emitters.

Hwa Sub Oh, Ho Soung Ryu, Joon Mo Park, Hyung Joo Lee, Young Jin Kim, In Kyu Jang, Ji Hoon Park, Joon Seop Kwak, Jong Hyeob Baek

Index: J. Nanosci. Nanotechnol. 13(1) , 564-7, (2013)

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Abstract

We investigate Ga0.33In0.67P quantum dot structures appropriate for special lighting applications in terms of structural and optical behaviors. The Ga0.33In0.67P materials form from 2-dimentional to 3-dimensional dots as the nominal growth thickness increases from 0.5 nm to 6.0 nm, indicating a Stranski-Krastanov growth mode. As the ambient temperature is increased to 300 K, the PL spectrum of the B-type dots is annihilated quickly because the large dot size induces a defect-related nonradiative recombination process. In contrast, the PL spectrum of the A-type dots is well maintained to 300 K. These data indicate that the Ga0.33In0.67P material is appropriate for an active layer of 700 nm light emitters.