Using LDA for Innovation Topic of Technology : Quantum Dots Patent Analysis Nurmitra Sari Purba 1 , Rani Nooraeni 2 15.8804@stis.ac.id 1 , raninoor@stis.ac.id 2 STIS, Politechnic of Statistics,,East Jakarta, 13330, Indonesia 1,2 Abstract.This study seeks to explore information about one of nanotechnology, quantum dots (QDs), through analysis of patent information. QDs patent documents obtained from the United States international patent database, the USPTO, use web scraping. In total, 3914 patents from 1988 to 2016 were taken and archived for analysis. This paper discusses how to apply Latent Dirichlet Allocation (LDA), a topic model, in a trend analysis methodology that exploits patent information. After the text preprocessing and transformation, the number of topics is decided using the log likelihood value. Then LDA model is used for identifying underlying topic structures based on latent relationships of technological words extracted. We extracted words from 6 relevant topics and showed that these topics are highly meaningful in explaining technology applications of QDs. Keywords: LDA, noun phrases extraction, patent map, quantum dots, text mining 1 Introduction Mastery of technology is the key to the success of a nation. This can be witnessed from the success of Japan, South Korea and Taiwan which grew from developing countries to developed countries, even though they did not have sufficient natural resources. These countries have increased R & D activities to obtain the best and competitive technology. The industrial revolution has evolved over 16 centuries, and as a result, the world economy has changed dramatically. Now, the world has begun to welcome the fifth era industrial revolution with its headline, "The fifth industrial revolution of nanotechnology". Even more striking is that nanotechnology is said to be able to reach the target of a country's economic achievement for a quarter of a century in just ten years (Rai and Rai, 2015). Nanotechnology, a field that is prioritized and promoted by governments in almost all the world, is one of the fastest growing research fields in the scientific and technical fields (NSTC, 2006). With nanotechnology, materials can be arranged in order of atoms per atom or molecule per molecule so that no waste is not needed. By rearranging or engineering the material structure at the nanometer level, the material will have far more special properties that outperform the previous material. This is the background of countries in the world to compete to allocate funds for the development of nanotechnology. (BPPI, 2008). One form of nanotechnology is quantum dots. By definition, QDs (quantum dots) are nano meter (nm) semiconductor materials, usually between 3 and 25 nm. When compared with the distance between atoms in a crystal arrangement, which is 1-2 angstroms (or 0.1 - 0.2 nm), the quantum dot (QD) consists of only about 1000 atoms. According to existing ICSA 2019, August 02-03, Bogor, Indonesia Copyright © 2020 EAI DOI 10.4108/eai.2-8-2019.2290336