This study aims to elucidate the history of commercialization of blue light-emitting diodes (LEDs) from the 1980s to the 2000s, focusing on the competitive relationship between Toyoda Gosei and Nichia Corporation, as well as on Nichia’s subsequent business development process. Blue LEDs, once considered unlikely to be realized within the twentieth century, were successfully commercialized in the 1990s and subsequently diffused across a wide range of applications, representing a paradigmatic case of innovation success. First, a review of the commercialization process reveals that Toyoda Gosei and Nichia, firms originally from industries unrelated to electronics, entered a technological domain from which major electronics manufacturers had withdrawn after years of unsuccessful efforts; ultimately, these firms achieved commercialization through intense competition. Second, this study highlights the approximately ten-year time lag between the development of various applications and the eventual market expansion of white LEDs created by combining blue LEDs with phosphors in mobile phone backlighting. However, prior studies have not sufficiently addressed the relationships among inter-firm competition, technological evolution, and the time lag in market growth. Accordingly, this study poses the research question, “Why did the commercialization of blue LEDs succeed?” It seeks to clarify (1) the impact of competition between Toyoda Gosei and Nichia on the commercialization process and (2) the process through which Nichia’s business development strategies led to market formation. These findings provide empirical evidence that a strong competitor can induce firms to adopt radically innovative technologies, thereby accelerating technological advancement. Furthermore, this study suggests that general-purpose technologies, including those long anticipated by society, may face significant obstacles to diffusion, including the need for complementary technological development for application creation, insufficient performance records, cost-effectiveness in the early stages, and biased resource allocation by monopolistic firms.

This paper examines the management of Ube Nitrogen Industry Co., Ltd., a synthetic ammonium sulfate enterprise in a coal-producing region, focusing on three aspects: the introduction of production technology, sources of investment capital, and cost management. The analysis clarifies how a local enterprise was able to construct competitiveness comparable to that of the emerging and major zaibatsu, which possessed abundant financial resources and extensive business networks.

The Okinoyama Coal Mine, the parent company of Ube Nitrogen Industry, maintained management based on local capital for a long period. By the early Shōwa era, access to managerial resources for local enterprises gradually improved, enabling Okinoyama to acquire patents and production know-how from central firms. Ube Nitrogen Industry did not simply adopt technology but studied the failures of predecessors, reduced construction costs, and developed its own techniques, while eliminating external influence to secure business opportunities.

The proximity of Okinoyama Mine allowed Ube Nitrogen Industry to use local coal as raw material, reducing transportation and handling costs and facilitating coordination across upstream and downstream transactions. Continuous improvements in gas generators raised gas yields to competitive levels. Okinoyama, with a stable management base, supplied coal at restrained prices, supporting cost reduction and capital accumulation.

Financing relied primarily on stock issuance, with shareholders rooted in the local community. This solidarity among regional investors provided crucial support for Ube Nitrogen Industry as a latecomer enterprise.

Through these strategies, Ube Nitrogen Industry, though a local firm entering the industry later, was able to narrow disparities with established companies, achieve parity, and in some cases secure advantages, ultimately joining the ranks of major enterprises in the sector.