In 1871, he began teaching Literature and Philosophy at the Military College but resigned in 1874.

In 1872, he applied for the position of professor of Modern Literature on the Curso Superior de Letras, competing against Pinheiro Chagas and Teófilo Braga, with Braga ultimately securing the role.

Luciano Cordeiro maintained a prolific journalistic career. Though he stepped down as director of A Revolução de Setembro, he continued as an editor. He also contributed to A Voz Académica [The Academic Voice], O País [The Country], A Atualidade [Current Affairs], O Jornal de Comércio [The Journal of Commerce], O Comércio do Porto [Porto Commerce], Diário de Notícias [Daily News] , among others. He served as director and owner of Comércio de Lisboa [Lisbon Commerce] and co-founded Revista de Portugal e Brasil [Magazine of Portugal and Brazil] . In addition to articles for various periodicals, he published books on a wide range of subjects. As a professor, he wrote extensively on literature and pedagogical aspects related to instruction and education. His independent studies in economics and finance also influenced his writing. His passion for history led him to produce works on archaeology, epigraphy, and geography.

In his historiographical works, Luciano Cordeiro placed great emphasis on studying various figures and the relationships, both nationally and internationally. His book A Segunda Duquesa [The Second Duchess] focuses on the biography of Princess Joana de Mendonça, the second wife of Duke Jaime, the fourth Duke of Bragança. Uma sobrinha do Infante [A Niece of the Infante] centres on Princess Leonor, daughter of King Duarte and niece of Prince Henry the Navigator, who married the German Emperor Frederick III. Berenguela e Leonor, rainhas da Dinamarca [Berenguela and Leonor, Queens of Denmark] explores the marriage of Princess Berenguela, daughter of King Sancho I, to Valdemar II of Denmark, and the marriage of his son, Valdemar III, to another princess, Leonor, Berenguela's niece. In O Tesouro do Rei D. Fernando [The Treasure of King Fer dinand], Luciano Cordeiro examines a little-known treaty in Portuguese historiography, signed in 1377 between Ferdinand I of Portugal and the Duke of Anjou, son of Charles V of France, to unite against Aragon. In A urna funerária de Afonso de Albuquerque [The Funerary Urn of Afonso de Albuquerque], he describes the process that led to the discovery of Afonso de Albuquerque's urn in Goa and its subsequent transfer to Lisbon, where it was housed at the Geographical Society. He also wrote about renowned navigators, including Diogo Cão and Diogo de Azambuja.

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